Archive for category: electronics

Hadie High Altitude Balloon Project

December 21, 2011 | Amateur Radio, electronics, High Altitude Balloon | By: Mark VandeWettering

While listening to the Amateur Radio Newsline podcast this week, I was interested to hear that a group of hams from Ireland had launched a balloon which transmitted digital pictures back from the balloon while it was at altitude, using a version of dl-fldigi. While I was familiar with fldigi, I hadn’t heard of this […]

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Alan’s Advent Calendar of Circuits 2011

December 19, 2011 | electronics | By: Mark VandeWettering

A couple of years ago, I was big into QRSS and wrote some software to do unattended captures of the portion of the 30M band where people were operating beacons. It was through this rather unconventional means that I first discovered Alan, VK2ZAY, as his callsign scrolled across in DFCW. If you look at this […]

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Project Completed: My $.99 Christmas LED hat, with ATtiny13 controller

December 18, 2011 | Arduino, diy, electronics, LED | By: Mark VandeWettering

Well, it’s done! Here’s my ATtiny13 controlled Christmas LED hat. It consists of an 8 pin, ATtiny13 microcontroller, a pair of 2N3904 transistors and some 1K resistors, a 7805 voltage regulator with two filter caps, and a switch, all mounted on a Radio Shack perfboard inside an Altoids tin. I’m rather pleased with the way […]

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Christmas Lights powered by an ATtiny13

December 16, 2011 | Arduino, Arts and Crafts, electronics | By: Mark VandeWettering

While waiting for my bread to rise the other day, I moved my breadboard ATtiny13 circuit that blinked two leds to a small Radio Shack perfboard, added a couple of switching transistors (2N3904s) to power the LEDs, and built a small 7805 regulator (which doesn’t yet have any filter caps, I’ll get to that). But, […]

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Microcontroller cheat sheet

December 13, 2011 | Arduino, electronics, Hardware, Microcontrollers | By: Mark VandeWettering

I needed to know the pinouts for various AVR chips and the 6 pin ICSP cable they used. I found this cool little one page sheet that had that, and more. Saved for future reference: Microcontroller cheat sheet.

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Carmen makes an Arduino Stoplight

December 12, 2011 | Arduino, electronics, LED | By: Mark VandeWettering

Today, Carmen decided that she wanted to give Arduino programming a try. She’s an experienced programmer, but had never tried any of this small embedded stuff, and knows relatively little about electronics, but with a little direction from me, she got the Arduino development environment installed, and we did a bit of playing around. I […]

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The “Hello World” of Servo Programming on the Arduino

December 10, 2011 | Arduino, diy, electronics | By: Mark VandeWettering

This morning I woke up around 5:30AM to catch the lunar eclipse. It was pretty nice: totality began around 6:05AM and the moon became incredibly dark and red. But 30 minute later, it had progressed low enough that it entered the offshore clouds that signaled the arrival of the morning fog. So, I came back, […]

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More Wisdom on LEDs…

December 7, 2011 | Computer Graphics, electronics | By: Mark VandeWettering

More important help for the budding young electronics designer: Little known fact: If you wire up an LED backwards, it actually works as a dark-emitting diode. 12/7/2011 3:38 pm via webReplyRetweetFavorite @EMSL Evil Mad Scientist Note: this also works in computer graphics quite well. Just specify a negative intensity for the light value.

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More on $.99 Christmas lights…

December 6, 2011 | diy, electronics, Merry Christmas | By: Mark VandeWettering

I didn’t have a lot of time to do anything significant tonight, but I wanted to test a few things about this strand of Christmas lights using a multimeter and some simple math. Recap: there are two strands of LEDs, each wired in parallel. One strand consists of 4 red and 4 yellow LEDS. The […]

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Correction: Schematic for $.99 Christmas Lights

December 6, 2011 | electronics | By: Mark VandeWettering

I was in a hurry yesterday, and didn’t draw the LED connections in my schematic for the $.99 Christmas lights properly. Mike pointed it out to me on twitter, so I thought I’d post a corrected version of the schematic. I’ve also updated the schematic in the original post, so no one will be led […]

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Dissecting a set of $.99 battery powered Christmas lights…

December 5, 2011 | Arduino, Arts and Crafts, electronics | By: Mark VandeWettering

I was over at the CVS repository today, and saw that they had some small strings of fifteen LED Christmas lights on sale for a paltry $.99 (if you used your CVS discount card). That was simply too much to resist, so I got a couple of strings, and thought that I would use them […]

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The art of capacitive touch sensing

November 28, 2011 | Arduino, electronics | By: Mark VandeWettering

I didn’t get a lot of electronics hacking done, but I found myself again playing with capacitive sensing. I found this interesting article on the EE Times website: The art of capacitive touch sensing It also pointed me at the following pretty cool Youtube! vid by the folks at Nerdkits: My experimentation thus far has […]

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The Sparkfun Serial LCD

November 24, 2011 | Arduino, electronics | By: Mark VandeWettering

I was driving around various Silicon Valley electronics and surplus stores (like HSC and Anchor Electronics) and decided to stop in at Microcenter. I remembered that they supposedly were beginning to stock items from Sparkfun and the Maker Shed. And, indeed they do! I found a Serial LCD module from Sparkfun that I thought might […]

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Using a 1N4148 diode as temperature sensor…

November 21, 2011 | Arduino, electronics | By: Mark VandeWettering

I had an application where I wanted to detect temperature. No big deal, lots of good temperature sensors exist. But of course, I don’t have any of those. Rather than order something from sparkfun, I thought I’d just try to see what I could do with the stuff I had on hand. What I had […]

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A cool little computer: FIGnition

November 19, 2011 | electronics, Link of the Day | By: Mark VandeWettering

I keep looking for cool projects where people build small computer and microcontrollers, more or less from scratch. Today, I ran across FIGnition: FIGnition is a £20 educational DIY computer which works like an 8-bit home Micro: outputting to composite video and ready to be interactively programmed from the moment you switch it on. It […]

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