Awesome. I’ve been having fun with my Gameduino for the couple of days I’ve had it, so I’m glad to see that Seeed Studio has picked them up to offer for sale. The cost is $53, which is identical to the price of the original Kickstarter offering. No need to kick yourself for missing out: you can now play with the rest of us.
Monthly Archives: June 2011
Cheap ($15) ($14) Robot Swarm developed at Harvard
I initially overcharged my readers by $1, corrected.
Just a cool link to the Kilobot project: an inexpensive platform for exploring cooperative robot swarms. The robots themselves are rather like Bristlebots: they use a pair of vibration motors which bounce the robot on rigid legs, allowing them to turn and move over smooth surfaces. They also employ a rather clever communication technique using infrared leds which are carried underneath. The light bounces off the tabletop and can reach nearby robots, or an overhead master beacon controller can broadcast programs and data to all robots simultaneously.
More information and videos of the Self-organizing Systems Research Group
Displaying a graphic on the Gameduino…
Okay, so yesterday I did some sprite animation and learned a bit about how color maps work on the Gameduino. I didn’t have a lot of time to tinker with the Gameduino tonight, but I did want to test my understanding of sprites, so I made a simple little program to display my brainwagon logo (blue Mark and his wagon o’ brains) on the left using the Arduino.
There are a few things that you have to understand.
First, there is memory for 64 sprite images, each one being 16×16 pixels. But that’s if you use 8 bit colormaps. If you choose to just use 4 bit maps, you can get twice as many. I rescaled my logo to be 96×128 pixels (a convenient multiple of 16) and used the netpbm utilities to convert it down to just 16 colors. Normally, that would be 6*8 = 48 sprite images, but since we are just using 16 colors, we end up with using 24 sprites. I wrote a shell script and a small C program to use the netpbm to dump the raw bits, and then used John’s python “compress” function to compress the array into an array that can be stored in flash memory. The net result is the following display, followed by the code used to display it.
[sourcecode lang=”C++”]
#include
#include
#include
static PROGMEM prog_uchar data[] = {
0xc1, 0x21, 0x20, 0x8a, 0x10, 0x61, 0x22, 0xc0, 0xcc, 0x04, 0x44, 0x20,
0x84, 0x7d, 0x18, 0x86,
0x63, 0x04, 0x9a, 0x0a, 0xe4, 0x08, 0x35, 0x93, 0x0e, 0xa2, 0x4c, 0x05,
0x90, 0x61, 0xc1, 0x86,
0x73, 0x18, 0x87, 0x08, 0xc1, 0xa1, 0x11, 0x11, 0xa2, 0xc2, 0x33, 0x80,
0x71, 0xe0, 0xc0, 0x85,
0x39, 0x00, 0x70, 0x05, 0xa0, 0x28, 0x51, 0x82, 0x03, 0x10, 0x0f, 0x8e,
0x70, 0x8d, 0xc0, 0xf0,
0xc6, 0x13, 0x4f, 0x01, 0x1d, 0x03, 0x82, 0x03, 0x22, 0xbc, 0x13, 0x38,
0xb8, 0x52, 0x23, 0xbd,
0x33, 0x34, 0xbc, 0xe3, 0x3f, 0x53, 0xd4, 0xa4, 0x77, 0x46, 0x25, 0x51,
0xfc, 0x45, 0xc8, 0x40,
0x62, 0xc6, 0x11, 0xff, 0xe1, 0xd0, 0x1e, 0xf1, 0xdf, 0x04, 0xb1, 0x80,
0x59, 0x54, 0xfa, 0x07,
0x3e, 0x66, 0x31, 0x01, 0xf0, 0xf9, 0x21, 0x24, 0xe6, 0x0b, 0x23, 0x3c,
0x7c, 0x22, 0xf2, 0x2b,
0xe2, 0x5f, 0xc4, 0x07, 0x3c, 0x87, 0xe0, 0xa0, 0x10, 0x21, 0xea, 0x2b,
0xdf, 0x42, 0x85, 0x08,
0x1c, 0x11, 0x64, 0xf8, 0x2d, 0x44, 0xcd, 0xf7, 0x7f, 0x04, 0xc4, 0x75,
0x36, 0x7e, 0x38, 0x7d,
0x50, 0x0c, 0x5c, 0x8e, 0x8a, 0xfb, 0xfe, 0x18, 0x55, 0x01, 0xa8, 0x39,
0xdc, 0x65, 0xe9, 0xd2,
0x85, 0x2a, 0x22, 0x1c, 0x13, 0x0e, 0x17, 0x55, 0xb0, 0x60, 0xf1, 0x42,
0xa5, 0x0b, 0xa6, 0x6e,
0xc9, 0xf1, 0xaa, 0x0b, 0x16, 0xa8, 0x00, 0xe4, 0xcd, 0x34, 0x6d, 0x64,
0xa1, 0xa2, 0xc5, 0x0b,
0x14, 0x10, 0x50, 0x8c, 0x79, 0x71, 0x29, 0x07, 0xc5, 0x01, 0xa0, 0x0b,
0x0a, 0x17, 0x26, 0x4c,
0x78, 0x59, 0xb6, 0xcc, 0x18, 0x30, 0xe0, 0xb0, 0x54, 0xac, 0x19, 0x0a,
0x90, 0xd8, 0x60, 0x65,
0x8b, 0xb1, 0xe5, 0x70, 0x00, 0x15, 0x1e, 0xaa, 0x14, 0x53, 0xb6, 0x62,
0x8b, 0x15, 0x67, 0xce,
0x80, 0x79, 0xb1, 0xaa, 0x0c, 0x58, 0x90, 0x21, 0x43, 0x61, 0x42, 0x25,
0x37, 0xe2, 0xc2, 0x96,
0xe5, 0x42, 0x04, 0xc5, 0xfa, 0xdf, 0x83, 0xe9, 0x0a, 0x54, 0x84, 0xc7,
0x4d, 0x84, 0x4e, 0x74,
0x89, 0x12, 0x11, 0x1f, 0x1f, 0x91, 0xd0, 0xa6, 0xa2, 0x2b, 0x3e, 0xca,
0x63, 0x03, 0xde, 0x2b,
0x00, 0x04, 0x7f, 0xa2, 0xe0, 0x97, 0x89, 0x60, 0x51, 0x46, 0x4c, 0x86,
0x83, 0xe0, 0x78, 0x7c,
0x4b, 0x51, 0xa6, 0x0c, 0x9b, 0x32, 0x6a, 0xd4, 0x74, 0x42, 0x2a, 0xfe,
0xc5, 0x7d, 0x4c, 0x0d,
0x53, 0xa6, 0xc3, 0x49, 0xd4, 0x67, 0xbc, 0xa2, 0xa8, 0x08, 0x0a, 0x98,
0xf0, 0x08, 0xc8, 0xa0,
0x8a, 0xcc, 0x28, 0x82, 0x00, 0x4b, 0x57, 0x24, 0x27, 0xb7, 0x00, 0x81,
0x0a, 0x81, 0x02, 0xd0,
0x0d, 0x51, 0xa3, 0x42, 0xd5, 0x18, 0x31, 0xaa, 0xc6, 0x14, 0x0e, 0x42,
0x45, 0x2b, 0xe0, 0xc6,
0x94, 0x35, 0x07, 0x08, 0xda, 0x95, 0x62, 0xc7, 0x80, 0x1d, 0x23, 0x6e,
0x8c, 0xa2, 0x85, 0x0b,
0xa7, 0xce, 0x14, 0x00, 0x00, 0x60, 0xd0, 0x94, 0xa9, 0xc5, 0x86, 0x17,
0x2f, 0x56, 0xa5, 0x02,
0x85, 0x09, 0xa4, 0x0e, 0x95, 0x1b, 0x30, 0x60, 0xda, 0xa1, 0x2b, 0x8f,
0x08, 0xe5, 0x4a, 0x95,
0xc6, 0x83, 0x30, 0xae, 0xcc, 0xa8, 0x59, 0xe5, 0x0e, 0x1c, 0x3a, 0x42,
0xa4, 0xc0, 0x94, 0x29,
0x15, 0x26, 0x5c, 0xac, 0x30, 0x60, 0x00, 0x34, 0x40, 0xe7, 0xca, 0x8d,
0x2a, 0x5c, 0x6d, 0xd0,
0xb4, 0x2b, 0x0f, 0x07, 0xe1, 0x02, 0xf0, 0xe0, 0x39, 0xe8, 0x40, 0x0f,
0xff, 0xf0, 0xc3, 0x11,
0xff, 0xe1, 0x9f, 0x31, 0x86, 0xe3, 0xbf, 0xe0, 0xf3, 0x17, 0x0b, 0x96,
0xca, 0x2f, 0xff, 0xfa,
0x6f, 0xff, 0xf6, 0x6b, 0xf0, 0xf0, 0xcb, 0xfb, 0xf0, 0x5f, 0xf4, 0xf8,
0xdf, 0xf2, 0xfe, 0xc0,
0x13, 0x7e, 0x82, 0x4f, 0x52, 0xf2, 0x79, 0x84, 0x9f, 0xe0, 0x00, 0x54,
0x0c, 0x38, 0x3c, 0x43,
0x25, 0x70, 0xc2, 0x43, 0x8c, 0x99, 0xb0, 0x57, 0x1c, 0x9f, 0x01, 0xc0,
0xc5, 0xb2, 0x2d, 0xc6,
0x8c, 0x39, 0x83, 0xe2, 0x45, 0x8b, 0x17, 0x28, 0x50, 0xa0, 0x01, 0x72,
0x66, 0x4c, 0x39, 0x2c,
0x02, 0x93, 0x17, 0x2c, 0xd6, 0xa0, 0x01, 0x01, 0x00, 0xca, 0xdd, 0xb2,
0x63, 0xce, 0x80, 0x41,
0x01, 0xe6, 0xec, 0xca, 0x96, 0x6b, 0xae, 0xdc, 0xb9, 0x71, 0x65, 0xca,
0x37, 0x2e, 0x32, 0x91,
0x73, 0x78, 0xb0, 0xe6, 0x0a, 0x0c, 0x00, 0x07, 0x6b, 0x60, 0x81, 0xc7,
0x63, 0x26, 0x70, 0xb6,
0xc5, 0x10, 0x20, 0x70, 0x0e, 0x1c, 0x38, 0x5a, 0x65, 0xc6, 0x3c, 0x1e,
0x39, 0x03, 0x01, 0x19,
0x17, 0xdc, 0xd9, 0x72, 0x07, 0x96, 0x10, 0xc0, 0xd9, 0xc6, 0x03, 0x63,
0xd6, 0x0c, 0x6d, 0x5b,
0x64, 0xc7, 0xd7, 0x3a, 0xf7, 0x44, 0x00, 0xc0, 0xcd, 0x5a, 0x5a, 0xf0,
0x06, 0x96, 0x12, 0xd6,
0xf8, 0xf2, 0xe5, 0xca, 0x1c, 0x22, 0x75, 0x07, 0xce, 0x1c, 0xf4, 0x07,
0x57, 0x0e, 0x0c, 0x28,
0xb8, 0x75, 0xe0, 0xdc, 0x99, 0x43, 0xab, 0xd6, 0x2c, 0x04, 0x00, 0x65,
0x5a, 0xee, 0x1c, 0x44,
0x83, 0x75, 0x06, 0x0c, 0x2c, 0x94, 0x07, 0x07, 0xe6, 0xd6, 0xac, 0xcd,
0x81, 0x3d, 0x0b, 0xd6,
0x2d, 0x70, 0x67, 0xce, 0x90, 0x69, 0x1f, 0xd0, 0xe3, 0x67, 0xcf, 0x9e,
0x25, 0xdb, 0xf6, 0x2c,
0x32, 0xe5, 0x47, 0x0f, 0x9e, 0x3e, 0xb8, 0x70, 0xe9, 0xd2, 0xb5, 0xcb,
0xd6, 0x2e, 0x3b, 0xab,
0x41, 0x10, 0x14, 0xa1, 0x40, 0x97, 0x6d, 0x04, 0xc2, 0xad, 0x8f, 0x22,
0x08, 0x4f, 0xb8, 0xce,
0xd8, 0xd2, 0xa5, 0x46, 0xd7, 0x99, 0x5d, 0x66, 0xcc, 0xec, 0x86, 0x07,
0x5b, 0x66, 0x6c, 0x9d,
0x59, 0x73, 0xeb, 0x36, 0x1d, 0x92, 0x83, 0x1b, 0x37, 0x66, 0xf1, 0x11,
0x9a, 0x74, 0x03, 0x01,
0x5a, 0x7c, 0x70, 0xe3, 0x1b, 0x0e, 0x6c, 0x81, 0x71, 0x67, 0xe6, 0x8c,
0x1b, 0x3b, 0x86, 0xc0,
0x80, 0x03, 0xd7, 0x0e, 0x4d, 0x83, 0x70, 0xe1, 0x02, 0xd2, 0x02, 0x38,
0x75, 0x6e, 0xfc, 0xf8,
0x32, 0x4b, 0x06, 0xe6, 0x91, 0x20, 0x4c, 0x98, 0x5a, 0x66, 0xc0, 0x46,
0x02, 0x1a, 0xc3, 0x19,
0xf8, 0x03, 0x0e, 0x00, 0xe2, 0x51, 0xc0, 0x42, 0x7c, 0x01, 0xd8, 0x0a,
0x58, 0x04, 0x6e, 0xc0,
0x40, 0x2b, 0x30, 0x60, 0x4c, 0x2c, 0x70, 0x6e, 0x6c, 0x01, 0x04, 0x00,
0x3b, 0x8e, 0x1c, 0xa1,
0x69, 0x03, 0xaa, 0x56, 0xac, 0x30, 0x01, 0x95, 0xf1, 0x14, 0xdf, 0x00,
0x8e, 0x1b, 0x50, 0x80,
0x0c, 0xb5, 0x46, 0x80, 0x68, 0xd1, 0xce, 0x9c, 0x39, 0x75, 0x17, 0x00,
0x54, 0xe9, 0x41, 0x63,
0x0a, 0x0d, 0x1e, 0x5f, 0x75, 0xe2, 0xc4, 0xd9, 0xb3, 0x1b, 0xc0, 0xfc,
0x56, 0x70, 0x3b, 0xc0,
0x8a, 0x15, 0xbb, 0x18, 0x6c, 0xad, 0x71, 0x0f, 0x04, 0xbe, 0xd6, 0x98,
0x72, 0x03, 0x08, 0xb6,
0x03, 0xcc, 0x5a, 0xb3, 0x9e, 0x00, 0x6c, 0x99, 0x5b, 0x67, 0xc6, 0x94,
0x29, 0x30, 0xa0, 0xc0,
0x80, 0x99, 0x35, 0x7b, 0x96, 0x01, 0x11, 0xde, 0xcc, 0xb8, 0x2e, 0x81,
0x51, 0xa3, 0x60, 0xb9,
0x6b, 0xd3, 0xa6, 0x3d, 0x00, 0xb4, 0x69, 0xd5, 0xaa, 0x9d, 0x6a, 0x78,
0x08, 0x14, 0xc4, 0x56,
0x9b, 0xde, 0x08, 0xe0, 0x86, 0x8c, 0x5b, 0x78, 0xa0, 0x0e, 0x0f, 0xd0,
0x0a, 0x0d, 0x82, 0x05,
0xa6, 0x56, 0x99, 0x72, 0xe4, 0xc8, 0x81, 0x2b, 0x05, 0xaa, 0x0d, 0x22,
0x70, 0x65, 0x02, 0x45,
0x67, 0x06, 0x30, 0xe5, 0x01, 0xa8, 0x4c, 0x29, 0x52, 0xa4, 0xf0, 0xb4,
0x2a, 0x0d, 0x0f, 0x6d,
0x1a, 0x73, 0x42, 0x2b, 0xc7, 0x20, 0xc8, 0x06, 0xe4, 0x50, 0x91, 0xc5,
0xa7, 0x19, 0x31, 0x62,
0x04, 0x07, 0x90, 0xe2, 0x00, 0x08, 0x2e, 0x35, 0xe1, 0xa0, 0x26, 0x0c,
0x01, 0x23, 0xd6, 0x1c,
0x00, 0x88, 0x15, 0x8b, 0x11, 0xa1, 0x22, 0x1c, 0xf4, 0x68, 0xa6, 0xec,
0x98, 0x32, 0x65, 0xc8,
0x01, 0x08, 0x03, 0x86, 0x0c, 0x15, 0x70, 0xdc, 0xd0, 0x81, 0x1c, 0x1b,
0x9c, 0xe3, 0x51, 0x07,
0x0f, 0x10, 0x3c, 0x68, 0xe9, 0x86, 0xa3, 0x47, 0x47, 0x2a, 0x86, 0x53,
0x00, 0xe8, 0xe4, 0x08,
0x0e, 0x2a, 0x0f, 0x30, 0x88, 0xe3, 0x20, 0x1e, 0xc3, 0x41, 0x97, 0x46,
0x7d, 0x1a, 0x75, 0x83,
0xe6, 0xa3, 0x87, 0x33, 0xe0, 0x00, 0xe4, 0xc1, 0x83, 0x17, 0x47, 0x7e,
0xbc, 0x79, 0x73, 0xd2,
0xa0, 0x46, 0x45, 0x3b, 0x89, 0x10, 0xa1, 0x0a, 0x34, 0x38, 0x8e, 0x9c,
0x38, 0x70, 0xd0, 0xd5,
0x08, 0x22, 0xc2, 0x51, 0x54, 0x00, 0x00, 0x05, 0x0a, 0x80, 0x57, 0x00,
0xe8, 0x50, 0x11, 0x1e,
0x8a, 0x55, 0x04, 0x80, 0x2a, 0xd5, 0xe0, 0x14, 0xa8, 0x02, 0x05, 0x8a,
0x97, 0x2e, 0x3d, 0x7a,
0x50, 0x24, 0x44, 0x3c, 0x0a, 0x55, 0x0d, 0x2a, 0x3c, 0x0b, 0x02, 0x06,
0x0f, 0x18, 0x3a, 0x22,
0x50, 0xa0, 0x50, 0x55, 0xf1, 0xa0, 0x4a, 0x21, 0x00, 0xe0, 0x7c, 0x86,
0x82, 0x86, 0x2a, 0x51,
0x82, 0xc4, 0x09, 0x0a, 0x8f, 0x70, 0x00, 0xfa, 0x16, 0x2d, 0xd0, 0x93,
0x69, 0x21, 0x5a, 0x54,
0x21, 0x28, 0x54, 0xa6, 0x4c, 0x39, 0x70, 0x16, 0x2c, 0x40, 0x81, 0x80,
0x25, 0xd0, 0xa8, 0x29,
0x53, 0xe1, 0xa5, 0x5c, 0xb9, 0x6a, 0x30, 0x3c, 0x54, 0x80, 0xa0, 0x25,
0xd0, 0x60, 0x78, 0x0c,
0x44, 0x78, 0x2a, 0x03, 0x66, 0x91, 0xad, 0x5b, 0xba, 0xce, 0x9c, 0x41,
0xe3, 0x06, 0x0d, 0x9a,
0x5e, 0xb8, 0x74, 0xdd, 0x3a, 0xa3, 0x46, 0xdb, 0xa9, 0xb5, 0x70, 0x70,
0x16, 0x52, 0x01, 0x60,
0x97, 0xa9, 0x55, 0x6b, 0xae, 0x9d, 0x86, 0x04, 0x34, 0x6d, 0xdc, 0xc0,
0xce, 0x03, 0x38, 0x7b,
0xf6, 0xec, 0xda, 0xb6, 0xe7, 0xc0, 0x9d, 0x56, 0xae, 0x21, 0x00, 0x90,
0x23, 0x30, 0x60, 0xdc,
0xac, 0xbb, 0x75, 0xea, 0xce, 0x1d, 0x44, 0xd0, 0xbc, 0x6d, 0x67, 0x03,
0x05, 0x07, 0x14, 0xdc,
0xba, 0x85, 0x6e, 0x95, 0x9d, 0x3d, 0x76, 0x14, 0x1d, 0xba, 0x72, 0x6e,
0xd7, 0x82, 0x05, 0xeb,
0xb6, 0xed, 0x5a, 0xe5, 0xc7, 0x8e, 0x5f, 0x26, 0x58, 0xb7, 0x67, 0xd1,
0x22, 0xd3, 0x9c, 0xb0,
0xc7, 0x36, 0x08, 0xe2, 0xa2, 0x00, 0x0a, 0x82, 0x35, 0x53, 0x6b, 0x6c,
0x83, 0xc1, 0x2e, 0xbb,
0xd4, 0x64, 0x1b, 0x00, 0x7c, 0x6d, 0x5b, 0x67, 0x67, 0x37, 0x38, 0xe3,
0x80, 0x9d, 0xd5, 0x70,
0xb4, 0x6b, 0x8d, 0xb5, 0x75, 0x86, 0x56, 0x99, 0x31, 0x4d, 0xe5, 0xe8,
0x62, 0xc6, 0xda, 0x76,
0x67, 0x54, 0x47, 0x1a, 0x24, 0x66, 0x18, 0xf0, 0xe5, 0xc6, 0x2d, 0x1c,
0x18, 0xa4, 0x66, 0x41,
0xa4, 0x51, 0x71, 0xc5, 0x87, 0x05, 0xab, 0xa9, 0xb5, 0x1a, 0x4c, 0x99,
0x65, 0x07, 0x53, 0xb6,
0xb4, 0x59, 0x33, 0x68, 0x88, 0x90, 0xe2, 0xcd, 0x2a, 0x00, 0x42, 0x01,
0x2a, 0x74, 0xd7, 0x14,
0x68, 0xbb, 0xa3, 0xe8, 0x94, 0x36, 0x05, 0x0a, 0xb4, 0x02, 0x22, 0x12,
0x6c, 0x29, 0x47, 0x46,
0xdd, 0xc1, 0x24, 0xd8, 0x02, 0x05, 0x00, 0x00, 0x07, 0x0b, 0x0c, 0x38,
0x84, 0x87, 0x46, 0xde,
0xba, 0xa1, 0x43, 0xd0, 0x06, 0x01, 0xa2, 0x36, 0x6d, 0xc0, 0x21, 0xea,
0x55, 0x2b, 0x54, 0x34,
0x72, 0x00, 0x0a, 0x80, 0x73, 0xe0, 0xc6, 0x41, 0x63, 0x78, 0xe9, 0x56,
0x1d, 0x1e, 0xc8, 0x94,
0x01, 0xfb, 0x85, 0xdf, 0xe0, 0x07, 0x4e, 0x1f, 0x30, 0xa8, 0x5a, 0x15,
0x0a, 0x15, 0xa4, 0x2f,
0x29, 0xe0, 0xea, 0x05, 0xab, 0x17, 0xb8, 0x56, 0x8d, 0xe1, 0xa9, 0x48,
0x9c, 0x00, 0xbd, 0xd0,
0x99, 0x43, 0x8b, 0x00, 0xe8, 0xda, 0xa1, 0x42, 0x53, 0x08, 0x95, 0xab,
0x02, 0x71, 0xa2, 0xf4,
0x72, 0x03, 0xc6, 0x0d, 0x2c, 0x30, 0x6d, 0xc8, 0xb5, 0x86, 0x27, 0xd2,
0xf0, 0x02, 0x06, 0x0c,
0x38, 0x58, 0xe0, 0x6a, 0x81, 0x03, 0xd5, 0xa6, 0x94, 0x2a, 0x52, 0xe5,
0xea, 0x44, 0x35, 0x07,
0x77, 0x6e, 0xc7, 0xa8, 0x5d, 0xab, 0x36, 0xa0, 0x4e, 0x01, 0xaa, 0x4e,
0x4f, 0xbd, 0xda, 0xa8,
0x05, 0x82, 0x5e, 0x68, 0x40, 0x99, 0x01, 0x75, 0x18, 0x9e, 0x02, 0xb4,
0x21, 0x03, 0xce, 0x3d,
0x3f, 0xc0, 0x72, 0xe3, 0xaa, 0x8d, 0xab, 0x33, 0x85, 0xe1, 0x55, 0x0e,
0x71, 0x11, 0x10, 0xda,
0xc1, 0x6a, 0xe3, 0xe7, 0x0c, 0xa0, 0xc2, 0xf6, 0x54, 0x0b, 0x2c, 0x13,
0xc3, 0x03, 0x18, 0x43,
0xa0, 0xd4, 0x01, 0x2a, 0x55, 0x2a, 0x28, 0x3e, 0x16, 0xa0, 0x21, 0x02,
0x80, 0x1b, 0x53, 0xa0,
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0xe8, 0xc0, 0x15, 0x2d, 0x57, 0xe1, 0xe0, 0x28, 0xbc, 0xd1, 0xe9, 0x0b,
0x06, 0x47, 0xae, 0x02,
0x20, 0x9c, 0x9d, 0xba, 0x86, 0x07, 0x4e, 0x5f, 0x18, 0x44, 0x60, 0xb8,
0x38, 0xa2, 0xaa, 0x4e,
0x1f, 0xb8, 0x38, 0x4c, 0xcb, 0x70, 0x2e, 0x07, 0x75, 0xf1, 0x81, 0x8a,
0x2b, 0x3b, 0x7d, 0xda,
0x80, 0x51, 0x63, 0xc6, 0xd6, 0x99, 0x55, 0x6b, 0x5c, 0xd5, 0x0a, 0x13,
0xaa, 0x1a, 0x1c, 0x3b,
0xbd, 0x60, 0xf5, 0xea, 0x75, 0xcb, 0x96, 0xae, 0x56, 0x85, 0xe1, 0x60,
0x54, 0x80, 0x3a, 0x75,
0xec, 0xb4, 0x26, 0x23, 0x3d, 0x7b, 0x4c, 0xdd, 0x81, 0x13, 0x26, 0xcc,
0xb4, 0xa8, 0xf0, 0xd4,
0xae, 0x4c, 0x59, 0x02, 0xd0, 0xb5, 0x06, 0x0f, 0x6a, 0x5a, 0x08, 0x30,
0x21, 0x4e, 0x5c, 0x7e,
0x24, 0x46, 0x0d, 0x38, 0x65, 0xca, 0xce, 0x99, 0x5a, 0x81, 0xa2, 0x44,
0x89, 0x6b, 0x0c, 0x7d,
0xca, 0x05, 0x28, 0xd7, 0x06, 0x8b, 0x82, 0x3d, 0x6a, 0x5a, 0x45, 0x87,
0xa7, 0x38, 0xad, 0xfa,
0x54, 0xab, 0x52, 0x8e, 0x4c, 0x97, 0xeb, 0xfa, 0xd0, 0x27, 0x20, 0xbc,
0xb8, 0xc3, 0x53, 0x28,
0x4a, 0xb9, 0x72, 0x5d, 0x14, 0x99, 0xd9, 0xd5, 0x2a, 0x4c, 0x94, 0x08,
0x75, 0xaa, 0x79, 0xc1,
0x53, 0x1a, 0x1f, 0x0a, 0x74, 0x51, 0xa5, 0xc6, 0x96, 0x9f, 0xc0, 0x04,
0x08, 0x0d, 0x50, 0xf4,
0xc2, 0x8b, 0x41, 0x39, 0xb0, 0xe5, 0x2d, 0x50, 0x98, 0x80, 0xdc, 0x08,
0x0f, 0x70, 0xaa, 0x84,
0x29, 0x60, 0x0d, 0x15, 0x1a, 0x53, 0xd6, 0x02, 0x84, 0x0a, 0x07, 0xad,
0x4a, 0x55, 0x78, 0xe6,
0x43, 0x78, 0x68, 0xa3, 0xca, 0x40, 0x94, 0x68, 0x81, 0x1c, 0xc3, 0x93,
0x5f, 0x7d, 0x30, 0x60,
0x0d, 0x34, 0x3c, 0x55, 0x89, 0x12, 0x4a, 0x11, 0x94, 0x6a, 0x78, 0xfc,
0x14, 0x70, 0x60, 0xc5,
0x5b, 0xa9, 0x5e, 0xa8, 0xb6, 0xc2, 0x43, 0x34, 0x44, 0x56, 0xa0, 0xe1,
0xe9, 0x53, 0xc4, 0x80,
0x95, 0xea, 0xf0, 0xd0, 0x0a, 0x2b, 0x3e, 0x44, 0x81, 0xa3, 0x15, 0x9e,
0x00, 0x68, 0xf1, 0x52,
0xa8, 0x14, 0x98, 0x3e, 0x5a, 0xe1, 0x49, 0x03, 0x86, 0x1f, 0x1d, 0x3a,
0x54, 0x88, 0x50, 0xa5,
0x5a, 0xe1, 0x4b, 0xb4, 0x86, 0x62, 0xd5, 0x2a, 0xe0, 0xc0, 0xf0, 0x11,
0x1e, 0x2a, 0x54, 0x05,
0x84, 0xea, 0x5f, 0x68, 0x0d, 0x50, 0x2a, 0x48, 0xe8, 0x70, 0x91, 0x00,
0x3a, 0x78, 0xa0, 0x40,
0x01, 0xe0, 0x17, 0x14, 0xf4, 0x81, 0x9a, 0xd8, 0x00, 0x91, 0x01, 0x34,
0x02, 0x00, 0x86, 0x8e,
0x1b, 0xd0, 0xcd, 0x8b, 0x47, 0x2e, 0x88, 0xc0, 0x21, 0x22, 0x08, 0x54,
0xc8, 0xd0, 0x01, 0x8b,
0x22, 0x3d, 0xd8, 0x3a, 0x74, 0x91, 0x08, 0x40, 0x1c, 0x01, 0x10, 0x09,
0x05, 0x08, 0x4e, 0x23,
0x64, 0x2a, 0xe1, 0x14, 0x19, 0x84, 0x49, 0x11, 0xc6, 0x55, 0x01, 0xe2,
0x04, 0x2a, 0x51, 0x12,
0x9a, 0x84, 0x89, 0x04, 0x60, 0x44, 0x90, 0x22, 0x88, 0x0f, 0xa3, 0x10,
0x21, 0xf1, 0x11, 0x56,
0x81, 0x4d, 0x90, 0x1c, 0x41, 0x2c, 0xe1, 0x1f, 0x95, 0x44, 0xc3, 0x13,
0x4b, 0xf8, 0x13, 0x21,
0x49, 0x2e, 0x3e, 0x52, 0x23, 0x1f, 0xd2, 0x23, 0x2a, 0x02, 0x0a, 0x37,
0x3e, 0xa2, 0xa4, 0xc3,
0x2b, 0x2c, 0xf2, 0x15, 0x1f, 0x3e, 0x9c, 0xe9, 0x89, 0xb9, 0x7c, 0x49,
0xe7, 0x03, 0x56, 0x9c,
0xb5, 0x81, 0x23, 0x3d, 0x3b, 0x9a, 0x20, 0x51, 0xa2, 0xb8, 0x53, 0x32,
0xbf, 0x22, 0x3a, 0x3e,
0x08, 0x92, 0x8c, 0x45, 0x57, 0x01, 0xe8, 0xc0, 0x75, 0x00, 0x38, 0x0d,
0x0c, 0x77, 0xee, 0x3e,
0x42, 0x9f, 0x83, 0x08, 0xa0, 0x10, 0x2e, 0xf0, 0xe8, 0xb9, 0xd3, 0xf7,
0x09, 0x61, 0x01, 0x00,
0xb6, 0x6b, 0x87, 0x4e, 0x9d, 0x3a, 0x08, 0x83, 0xf0, 0x70, 0x47, 0x0f,
0x9e, 0x26, 0x42, 0xc4,
0x75, 0x87, 0x93, 0x53, 0x77, 0xf2, 0xe0, 0xc5, 0x17, 0x69, 0xe2, 0xe1,
0xe9, 0xce, 0x41, 0x20,
0x84, 0x87, 0xbe, 0xf4, 0xe4, 0x5d, 0x15, 0xa4, 0x35, 0xba, 0x73, 0x54,
0x9a, 0xe1, 0x05, 0x4f,
0x35, 0x14, 0x52, 0x04, 0x70, 0x6b, 0xac, 0xa5, 0xf8, 0x94, 0xe7, 0x94,
0x36, 0x10, 0x2d, 0x38,
0x70, 0xe0, 0x92, 0xe5, 0x28, 0x9c, 0xc2, 0x43, 0xa9, 0x4b, 0x27, 0x50,
0x14, 0x87, 0x27, 0x81,
0x70, 0x76, 0x27, 0x51, 0x25, 0x14, 0x27, 0x90, 0x15, 0x63, 0xce, 0x00,
0xa2, 0xe1, 0xed, 0x10,
0x89, 0x12, 0x2d, 0x8e, 0x35, 0x87, 0x07, 0xe9, 0x6f, 0xe8, 0xc1, 0x70,
0x70, 0xa2, 0x45, 0x89,
0xe6, 0xf0, 0xed, 0x01, 0x77, 0xee, 0x9d, 0xc4, 0x26, 0x60, 0xc7, 0x90,
0x05, 0xc7, 0x07, 0x51,
0x7c, 0x23, 0x10, 0x17, 0x8e, 0xe3, 0x83, 0x88, 0x62, 0xca, 0x8e, 0x15,
0x63, 0xc1, 0x82, 0xf5,
0x08, 0xdc, 0xb9, 0x76, 0x12, 0x1f, 0x50, 0x24, 0x2b, 0xce, 0xc0, 0xf0,
0xc0, 0x18, 0x9e, 0x4e,
0xd3, 0x21, 0x00, 0xa1, 0x68, 0xa6, 0x4c, 0x39, 0x3e, 0x70, 0x2b, 0x0d,
0xcf, 0x5e, 0x08, 0x00,
0x57, 0x4e, 0x5c, 0x46, 0x85, 0x3a, 0xdd, 0x8c, 0x98, 0xea, 0x63, 0x00,
0x0b, 0x94, 0x42, 0xa5,
0xca, 0xd8, 0xc1, 0x52, 0x25, 0x4a, 0xd4, 0x47, 0x50, 0xa4, 0x47, 0x8f,
0xb6, 0x6e, 0x45, 0x4a,
0xc3, 0x43, 0x1f, 0xab, 0xf0, 0x02, 0x07, 0x8f, 0x1d, 0x3b, 0x7a, 0xfa,
0x02, 0x40, 0xab, 0x5e,
0x78, 0xe1, 0x65, 0xd5, 0x1e, 0x3d, 0x7b, 0x11, 0x00, 0x2f, 0xbc, 0x99,
0x2a, 0x14, 0x28, 0x90,
0x1d, 0x43, 0xd6, 0xe1, 0xc1, 0x94, 0x5d, 0x36, 0x28, 0x55, 0xab, 0x95,
0x2b, 0x58, 0x61, 0xc2,
0x14, 0xaa, 0x06, 0x40, 0x8f, 0x29, 0x2b, 0x26, 0xaa, 0x54, 0x63, 0x0d,
0x0f, 0xde, 0xf9, 0xa9,
0x50, 0x11, 0x68, 0x7a, 0x14, 0xa9, 0xd0, 0x02, 0xa5, 0x5a, 0x5d, 0xf8,
0xa8, 0x56, 0xa5, 0x15,
0x1e, 0x6c, 0x26, 0x8c, 0x61, 0x85, 0xa7, 0x5e, 0x8e, 0xe1, 0x0d, 0x95,
0x1d, 0x6b, 0x26, 0x5c,
0x20, 0x6b, 0x89, 0x0f, 0x6d, 0x40, 0xe3, 0x4b, 0x17, 0x43, 0x7e, 0xe1,
0x01, 0x98, 0x31, 0x2b,
0xa0, 0xe1, 0xc1, 0x4f, 0x65, 0x7c, 0x80, 0x66, 0xa5, 0x11, 0x1c, 0x4b,
0x26, 0x40, 0x80, 0x04,
0x03, 0x50, 0xbd, 0x5c, 0x55, 0x97, 0x07, 0x6f, 0x56, 0x1c, 0xc1, 0x31,
0x89, 0x8f, 0x5b, 0x60,
0xcd, 0x2f, 0xbc, 0x59, 0xb3, 0x52, 0x0a, 0x90, 0x31, 0xe3, 0xf0, 0x00,
0xcc, 0x92, 0x1d, 0x5b,
0xb6, 0x4a, 0x45, 0x09, 0x60, 0xad, 0x4b, 0x9d, 0xea, 0xf0, 0x52, 0xac,
0x2b, 0x3c, 0x98, 0x29,
0x55, 0x2e, 0x9c, 0x35, 0x20, 0x75, 0x0a, 0xc2, 0x1b, 0x94, 0x46, 0xaa,
0x6c, 0xd7, 0x43, 0x98,
0x56, 0x85, 0x0a, 0x55, 0xe9, 0x62, 0xc5, 0x59, 0xb1, 0x12, 0x25, 0xb0,
0xe9, 0xf1, 0x15, 0x26,
0x4e, 0x18, 0x09, 0xc2, 0x44, 0x02, 0x18, 0x0b, 0x11, 0x9c, 0x24, 0x43,
0x2a, 0xbc, 0x95, 0x10,
0x91, 0xa2, 0x25, 0x00, 0xa0, 0x50, 0x09, 0xc0, 0xf8, 0x08, 0xc1, 0x00,
0x64, 0xa2, 0x05, 0x49,
0x00, 0x0c, 0x03, 0x10, 0x18, 0x94, 0xa1, 0x84, 0x6c, 0x78, 0xa2, 0x84,
0x4d, 0x1b, 0x15, 0xe0,
0x50, 0x0c, 0x44, 0x90, 0xa0, 0x51, 0x23, 0xa4, 0x4a, 0x91, 0x21, 0x6a,
0x54, 0xa0, 0x40, 0x02,
0x04, 0x1d, 0x06, 0x00, 0x01, 0xa2, 0x86, 0x44, 0x89, 0x11, 0x02, 0xd4,
0xb0, 0xc3, 0x23, 0x14,
0x00, 0x22, 0x44, 0x8d, 0x08, 0x12, 0x05, 0x06, 0x08, 0x10, 0x30, 0x70,
0xe8, 0x4c, 0x17, 0x80,
0xd0, 0xd0, 0xad, 0x31, 0x1c, 0x35, 0x30, 0x80, 0x44, 0xcd, 0x91, 0x43,
0x87, 0xb4, 0x20, 0x50,
0x82, 0x04, 0x1b, 0x22, 0x24, 0x8a, 0x94, 0xa8, 0x41, 0x84, 0x07, 0x0f,
0x6a, 0x00, 0x84, 0x45,
0x00, 0x84, 0x43, 0x60, 0x06, 0x40, 0x58, 0x40, 0x0b, 0x0a, 0x4a, 0x9a,
0x10, 0x21, 0x82, 0xa6,
0x49, 0x23, 0x42, 0xad, 0xa1, 0x01, 0x55, 0xa3, 0x6e, 0x46, 0x61, 0x01,
0x28, 0x00, 0x80, 0x01,
0x02, 0x0d, 0x00, 0x10, 0x82, 0x90, 0x00, 0x10, 0x80, 0x66, 0x02, 0x4c,
0x8d, 0x2a, 0x55, 0x6a,
0x02, 0x40, 0x55, 0xf8, 0xc7, 0x80, 0x18, 0x31, 0x6a, 0x02, 0x21, 0xfe,
0x23, 0x28, 0xcd, 0xb3,
0xde, 0x0c, 0xed, 0x00, 0xa0, 0x48, 0x8f, 0x9e, 0x3b, 0xd7, 0x01, 0xe0,
0x68, 0x2c, 0x9c, 0x06,
0xc4, 0x5a, 0x80, 0x06, 0x0d, 0x0e, 0x1c, 0xbc, 0x08, 0x8a, 0x24, 0x47,
0x80, 0x00, 0x02, 0x05,
0x1a, 0x1e, 0xe0, 0xf4, 0xd1, 0x76, 0xe4, 0x20, 0x80, 0x01, 0x76, 0x45,
0x7c, 0x26, 0x04, 0x42,
0x44, 0x10, 0x28, 0x44, 0x54, 0x7c, 0x84, 0x55, 0x60, 0x8e, 0x25, 0x02,
0x0d, 0x10, 0x1c, 0x84,
0x0d, 0xba, 0x28, 0x00, 0xba, 0x02, 0x00, 0xc2, 0x43, 0x43, 0xb8, 0x04,
0x10, 0x32, 0x4d, 0x9f,
0x11, 0x1f, 0xa1, 0xa4, 0x2f, 0x00, 0x82, 0xf0, 0x15, 0xd2, 0xa2, 0x33,
0x10, 0x6a, 0xd4, 0xaa,
0x31, 0x00, 0xb4, 0x6a, 0xd5, 0x37, 0x04, 0x0e, 0x1d, 0x0d, 0xe5, 0x77,
0x42, 0xd4, 0x08, 0x11,
0xa1, 0x6e, 0x8a, 0x0e, 0x03, 0x88, 0x22, 0x44, 0x44, 0xa8, 0x51, 0x4f,
0x12, 0x20, 0x4d, 0x90,
0x74, 0xeb, 0x46, 0xf4, 0x29, 0x81, 0x1f, 0x46, 0xaa, 0x4c, 0x7d, 0x47,
0x80, 0x80, 0x0a, 0x00,
0x30, 0x01, 0x61, 0x22, 0x40, 0x45, 0xfc, 0x45, 0x40, 0xaa, 0x51, 0xf3,
0xff, 0x7f, 0x11, 0xc1,
0xe1, 0x1f, 0xa3, 0xfc, 0xd4, 0xa9, 0x53, 0xc8, 0x9b, 0x35, 0xaf, 0x22,
0xd0, 0xa2, 0x85, 0x2a,
0x58, 0x65, 0x42, 0x85, 0x86, 0x43, 0x40, 0xf0, 0x63, 0xc7, 0x4f, 0xa1,
0x02, 0x5d, 0xb4, 0x78,
0xeb, 0x13, 0xab, 0x56, 0x28, 0xb8, 0x08, 0x04, 0xc7, 0x4e, 0x9f, 0xba,
0xa5, 0xa0, 0xa8, 0x51,
0x9f, 0x5a, 0x65, 0xea, 0xe0, 0x85, 0x0f, 0x20, 0x0d, 0x14, 0x34, 0x51,
0xd2, 0xa8, 0x4e, 0xac,
0x40, 0xa7, 0x05, 0x18, 0x1f, 0x8c, 0x34, 0x84, 0x07, 0x07, 0x07, 0x8a,
0xf2, 0x41, 0xac, 0x3d,
0x7a, 0xb7, 0xa1, 0x8f, 0x51, 0x18, 0x50, 0x4a, 0x00, 0x0d, 0x8a, 0x54,
0x27, 0x00, 0x3b, 0x7b,
0xee, 0xe0, 0x81, 0xa6, 0x64, 0x9b, 0x12, 0x24, 0x48, 0x0e, 0x14, 0x28,
0x10, 0x24, 0x50, 0x28,
0x3c, 0x76, 0xec, 0x28, 0x5e, 0x05, 0x6d, 0x86, 0xba, 0x5d, 0x6b, 0x12,
0xa4, 0x48, 0x90, 0x20,
0xa1, 0xf4, 0xa8, 0x32, 0x64, 0xc8, 0x31, 0x00, 0x1d, 0xea, 0x56, 0xad,
0x5a, 0x74, 0x00, 0x6a,
0x84, 0x4d, 0x9b, 0x22, 0xed, 0xc0, 0x70, 0x0d, 0x1b, 0xb5, 0xa2, 0x00,
0x88, 0x0f, 0x41, 0x1a,
0x10, 0x20, 0xd0, 0x90, 0x1b, 0x10, 0x20, 0x69, 0xd2, 0xf4, 0x17, 0xe1,
0xf5, 0xff, 0x21, 0x50,
0x1e, 0x02, 0x02, 0xa0, 0x0a, 0x02, 0x02, 0x00, 0x02, 0x54, 0xa8, 0xfe,
0xe2, 0x10, 0x54, 0x89,
0x0a, 0x00, 0x53, 0x26, 0x4c, 0x99, 0x42, 0xa1, 0x23, 0x00, 0x68, 0xe8,
0x51, 0x83, 0x46, 0x0f,
0x9f, 0xcf, 0x30, 0x11, 0x1e, 0x26, 0x74, 0xa8, 0x08, 0x03, 0x3d, 0x70,
0xf4, 0x44, 0xc4, 0x3f,
0x88, 0xf9, 0x2f, 0x35, 0xb1, 0x60, 0x06, 0x8c, 0x1a, 0x33, 0xf1, 0xa9,
0xc6, 0x0c,
};
void
setup()
{
delay(250) ;
GD.begin() ;
GD.ascii() ;
// setup the color map
GD.wr16 (PALETTE16A + 0, RGB (234, 215, 180));
GD.wr16 (PALETTE16A + 2, RGB (90, 105, 78));
GD.wr16 (PALETTE16A + 4, RGB (177, 214, 153));
GD.wr16 (PALETTE16A + 6, RGB (225, 233, 240));
GD.wr16 (PALETTE16A + 8, RGB (186, 209, 238));
GD.wr16 (PALETTE16A + 10, RGB (95, 69, 43));
GD.wr16 (PALETTE16A + 12, RGB (192, 134, 82));
GD.wr16 (PALETTE16A + 14, RGB (213, 141, 154));
GD.wr16 (PALETTE16A + 16, RGB (234, 234, 237));
GD.wr16 (PALETTE16A + 18, RGB (162, 201, 215));
GD.wr16 (PALETTE16A + 20, RGB (229, 234, 224));
GD.wr16 (PALETTE16A + 22, RGB (158, 139, 154));
GD.wr16 (PALETTE16A + 24, RGB (238, 246, 242));
GD.wr16 (BG_COLOR, RGB (238, 246, 242));
GD.wr16 (PALETTE16A + 26, RGB (190, 47, 49));
GD.wr16 (PALETTE16A + 28, RGB (91, 19, 27));
GD.wr16 (PALETTE16A + 30, RGB (87, 119, 158));
GD.uncompress(RAM_SPRIMG, data) ;
int i ;
for (i = 0x20; i < 0x80; i++) { GD.setpal(4 * i + 0, TRANSPARENT); GD.setpal(4 * i + 3, RGB(51,102,153)); } int x, y, s ; for (y=0, s=0; y<128; y+=16) { for (x=0; x<96; x+=32, s++) { GD.sprite(2*s, x+32, y+32, s, 4, 0, 0) ; GD.sprite(2*s+1, x+48, y+32, s, 6, 0, 0) ; } } GD.putstr(25, 12, "Brainwagon Demo") ; } void loop() { for (;;) ; } [/sourcecode]
Space Invaders Sound Emulation
My recent playing with the Gameduino had me thinking more about games like Space Invaders, and while I was searching around for bitmaps, I kept thinking about the sound effects. I didn’t realize this, but they were not digital sounds, but sounds produced by triggering a series of analog circuits. The schematics and some analysis of these circuits can be found at the following page:
Space Invaders sound emulation
It should be possible to use LTSpice and its own ability to write out WAV files to directly simulate these sound effects. This is of no real relevance to the Gameduino, but it is interesting in its own right.
My first code on the Gameduino, immediately upstaged by Gameduino Invaders
I received a cute gadget in the mail the other day: a Gameduino. It’s a small Xilinx FPGA on an Arduino shield that can create VGA and sound output. It acts like a simple coprocessor, connected via the SPI bus of the Arduino.
In an effort to get people started on thinking about the Gameduino, I tried to hack together a quick graphics demo, just to test my own basic understanding. The evening that I received it I only had an hour to hack, so I only got
this far:
But apparently this was enough to get me an email from Colin, who has started a page on Gameduino programming which seems awesome. In particular, he chose to implement a complete version of Space Invaders for the Gameduino. I bow in your direction, Colin. Truly awesome.
I haven’t had much more time to work on mine, but I might get a chance over the weekend. Stay tuned for further Gameduino experiments.
Boom! A big solar flare, with some links…
This morning’s massive coronal mass ejection from the Sun got me scrambling around trying to remember details of how amateurs can monitor solar flare activity during the current solar cycle. Mark Spencer, WA8SME, had some articles on building a small monitoring station that detected SIDs, or “sudden ionospheric disturbances”. The basic idea is to create a VLF receiver to pick up signals such as the strong one megawatt transmitter on 24Khz in Cutler, Maine, and then graph the overall signal strength and record it on the computer equivalent of a strip recorder. I know I have the QEX article from 2008 where he described this system, but I can’t find it. You might find this article to be of interest, as well as the great efforts of the AAVSO (American Association of Variable Star Observers). Here is another receiver circuit that I ran across.. All good stuff.
Op amps in small-signal audio design
KB6NU drew my attention to this article on using operational amplifiers in audio design. It’s apparently drawn from material in Douglas Self’s book Small Signal Audio Design. As someone whose really just become involved in the ins and outs of analog electronics, I find his pragmatic approach and explanations to be really helpful. Check it out.
G0NQE’s Acorn SDR receiver kit
Ever on the lookout for software defined radio designs, I was pleased to see G0NQE’s simple receiver design this morning. He offers a kit, but also offers the bare PCB board, and puts the schematic and parts list on his website. Very cool. It’s pretty much a textbook Tayloe-style switching detector, which is implemented entirely with common through-hole type chips. It uses a crystal oscillator which can be switched between a 14.7456 Mhz and a 15.0Mhz crystal, for reception centered on 3.68 and 3.75 Mhz. It uses the 74HC4052 as the analog switch, driven in quadrature and feeding an NE5532 op amp to provide the I/Q signals.
Check it out: g0nqe-acorn,sdr,receiver,kit.
Ham Radio Podcasts
I’ve been meaning to do a quick post about podcasts that I listen to that are related to ham radio, just in case there are some among you who may not have heard about them, or who may have heard about them but haven’t given them a try. Here’s a list of what I listen to, along with what I like about them:
- Soldersmoke: This podcast was recommended to me a couple of years ago by the staff at Ham Radio Outlet, and I’ve been an avid listener ever since. It’s the work of Bill Meara, N2CQR, who works for the State Department and enjoys radio as he moves around the globe. I’ve followed the podcast from London, to Italy, and now back to the States. Bill is interested in homebrew and QRP operation, and the topics generally reflect that. It’s mostly a one person affair, but Bill is a good speaker and engaging. He’s also written a book which you can get on Lulu and Kindle, detailing his adventures in radio. Despite the focus on homebrew and QRP, sometimes it drifts a bit into debugging computer equipment, travel and a fair amount of promoting his book, which may or may not bug you: check it out for yourself. I still eagerly await each episode.
- The ICQ Podcast: This is a great ham radio podcast, produced by Martin Butler, M1MRB and his son Colin, M6BOY. The format is usually a brief introduction, followed by news stories read by Colin and Martin, and then usually followed by a feature topic which Martin presents, sometimes with guests. Recently they have begun to add new content, including guest reporting and propagation reports. If you are just interested in ham radio news, this is a good podcast. What I really enjoy about the podcast is the honest enthusiasm they have for simply playing around with radios. While they are living in the UK, their news segments cover stories from Europe, the U.S. and Australia pretty regularly. The technical content isn’t super high, but I enjoy it.
- Ham Nation: A brand new podcast, as of this writing only two episodes exist, and I’ve only listened to one. Legendary ham and manufacturer of microphones Bob Heil is the host of this hour long program. In the first show, Bob was joined by musician Joe Walsh, WB6ACU and Dave Jennings WJ6W, and talked (for my tastes, somewhat vaguely) about the nominal topic of “The History of Ham Radio”, but really just talked about the history of Heil, Walsh and Jennings. It is being produced by Leo Laport’s TWiT network, and promises to be an interesting show with lots of good guests. On my commute today, I’ll listen to episode 2 on emergency communications, which has Gordon West as a guest. Keep an eye on this one.
Are there any others that people enjoy? Feel free to add them in comments below.
Dino Segovis builds a copy of Bell’s Photophone
Maker Dino Segovis has a website called hackaweek.com where he tries to do a hack a week, streaming his construction via uStream, and then posting youtube video and details on his blog. This week, he decided to build a copy of Alexander Graham Bell’s PhotoPhone in celebration of the 131st anniversary of its unveiling to the public.
I must admit though: I am not quite certain how it achieves modulation. Here’s my boggle: the solar cell produces a changing voltage in response to changes in the total number of photons which hit the cell. In Dino’s video, the solar cell is much smaller than the sun’s reflection (the reflection is five or six diameters). If the amplitude of the movement of the reflected disk is just a diameter or two (as it appears to be in the video) the solar cell would appear to be constantly illuminated, and there should be no change in the voltage produced.
But it obviously works, so there must be something else going on.
If there was a variation the brightness of the overall pattern from center to edge, then its movement would cause an amplitude variation. But what is the source of this variation? Defects in the mirror? Mirror curvature? Changes in the brightness of the sun disk from center to edge? Those variations all seem to be pretty small.
I’ve seen music transferred by the bouncing of a laser beam onto a solar cell, and that confused me as well.
Something to think about (and maybe build) once I get my laser diode modules from Deal Extreme.
What should Radio Shack do to satisfy the DIY/Maker community?
Radio Shack recently posted this (as yet, not incredibly popular) video asking for feedback on what they could do to support the DIY/Maker community:
I’ve thought about it off and on for the last couple of days, and read some other blog posts, and I thought I’d give my take on it.
I mostly don’t think they can help the DIY/Maker.
First of all, there is a cultural element. While Radio Shacks of the distant past used to be populated by people who might know something about electronics, for the most part when I go into them now I see kids working for minimum wage without any real knowledge or even excitement about electronics. They might be able to help you find the right 1/8″ jack Y-connector you need, or a battery, but for the most part, they don’t build things and therefore, they aren’t really very helpful to those who do. It’s nice to have a local store where I might be able to go in and get a voltage regulator or a MPF102, but I haven’t interacted with anyone at a Radio Shack in years who could tell me what one was, or even if they had them in stock faster than I could find them in their component cabinets.
Related to the first is that they simply have lost their niche. Thirty years ago, you might expect that you could see something in a Radio Shack store that was innovative and cool. Perhaps it was the TRS-80 or the Model 102. Maybe it was a ham radio or a scanner. Or even just a plain old stereo or radio (yes, they used to be more of a status symbol than they are now). Now, you simply see the same things that you can see at any of the big electronics stores like Best Buy, but you’ll probably pay more. They simply aren’t as relevent anymore: other than maybe an RC car or some batteries, most people I know don’t even consider making an electronic purchase at Radio Shack.
They also have pretty much abandoned the educational niche that they used to be good at. Let’s face it, there really wasn’t much practical reason to buy a 7400 series TTL gate, but I did, along with some books (probably by Forrest Mims) to help me understand how they work. I built crystal radios and had a 150 in one electronics kit. I learned alot. There are a lot of people today who would like to learn about how to assemble simple electronic and computer gadgets, but they can’t get those supplies at Radio Shack.
Lastly, they just aren’t innovative. Perhaps it is just because they are carrying the weight of their 4500 or so stores: there isn’t a way they can be sufficiently nimble. Small Internet basesd companies like Sparkfun, Adafruit Industries, Evil Mad Scientist Laboratories, and Seeed Studio are all actively, hungrily trying to develop and market new products, and to make components available to the Maker community. It’s these small companies and their innovation that I think are most exciting, and these are the people I feel more comfortable supporting, since it is obvious that these people “get it” to a degree that Radio Shack simply doesn’t.
What can Radio Shack do? Realistically, not much. If I was unrealistic? Okay, here are some ideas.
- Revamp your staff. Stop treating them like minimum wage register-jockies, and pursue those with an interest in electronics and in helping your customers.
- Bring back kits and educational toys. Consider it fertilizing the ground for the future. If kids aren’t exposed to this kind of tinkering, they aren’t going to grow into adults with lots of disposable income who tinker.
- Bring back ham radio equipment. Hams are tinkerers, you probably want them in your store. Radio Shack used to sell pretty decent and reasonably priced ham radio equipment and scanners. Sunspots are on the rise, and 10m will begin to heat up. Take advantage of the recent increase in hams caused by the dropping of the Morse code requirement, and figure out a way to get them into your stores.
- Pay attention to trends in open hardware, find popular items, and stock them. I’d go to the Shack to get an Arduino if they had them in stock. Or a Bus Pirate. Or some high power Cree LEDs. Or good solar cells and battery chargers.
- FInd local hacker/maker communities, and help them. Be nimble. Support your local groups by stocking the equipment and components they need.
- In short, ask yourself what the value is that you are delivering to your customers, and stop viewing them as mindless consumers. If you seriously want their business, seriously pursue it.
What do you all think? What could Radio Shack do for you that would make you cross their doorstep more often?