Archive for category: ESP8266

pinMode v. digitalWrite: what’s with this use (abuse?) of internal pullups?

March 4, 2017 | Amateur Satellite, ESP8266, My Projects | By: Mark VandeWettering

This post is the kind of round about post you get first thing in the morning.   I’ll get to the title question at the end. This morning, I was interested in doing a tiny bit of tinkering. I had found one of these 4 digit 7 segment LED displays while digging around for something […]

How making an ISS clock turns into researching an optimization problem involving spherical Voronoi diagrams…

February 20, 2017 | Amateur Satellite, ESP8266 | By: Mark VandeWettering

A few years ago, I got seriously interested in amateur radio and satellites. I would often haul out a small Yagi antenna and my trusty Kenwood TH-D7A and try to talk to other hams by bouncing signals off the various satellites which acted as amateur radio repeaters. During that time, I wrote a Python version […]

Simple tests using the WeMos D1 R2…

August 25, 2016 | ESP8266 | By: Mark VandeWettering

I didn’t have a ton of time to tinker when I got home, but I did play a tiny bit more with the WeMos D1 R2. I got it mounted on an old breadboard that I had previously used for Arduino experiments, and then tried reflashing it with new, fresh NodeMCU firmware that I built […]

New WeMos D1 R2 boards have arrived…

August 24, 2016 | ESP8266 | By: Mark VandeWettering

I just got a trio of WeMos D1 R2 boards from Banggood this morning. I haven’t had a chance to do anything with them yet, other than power one of them on and check it for basic function, but I thought I’d give a brief review. For those of you who maybe haven’t been tracking […]

Ordered some ESP8266 boards in an Arduino form factor…

August 20, 2016 | Arduino, Embedded, ESP8266, Hardware | By: Mark VandeWettering

The ESP8266 is an amazing little processor: cheap and capable and (most interestingly) WiFi enabled. I have some of the older “nodemcu” boards that I got for about $7 each, but there are newer alternatives that include up to 4M of flash memory, and a variety of interesting form factors. I noticed that WeMos was […]

The ESP8266…

July 28, 2015 | Embedded, ESP8266, LED | By: Mark VandeWettering

I’ve been quiet lately, but mostly because what tinkering I’ve been doing has been relatively limited in scope. But one thing I have begun to play with a lot are various tiny development boards based upon the Espressif ESP8266 WiFi chip. I’ve mentioned them a bit before, but I’ve made some progress since then (and […]

Weekend Update: Maker Faire, new gadgets, and I ground myself…

May 17, 2015 | Arduino, electronics, ESP8266, WSPR | By: Mark VandeWettering

Greetings readers. I’m hopefully wishing there is still more than one. This weekend was the Bay Area Maker Faire 2015, the 10th incarnation of an event which has become increasingly (even frighteningly) popular. I’m tempted to channel Yogi Berra, who said “Nobody goes there. It’s way too crowded.” Anyway, I got out of my house […]

Time from the ESP8266…

May 14, 2015 | Amateur Radio, Arduino, ESP8266, WSPR | By: Mark VandeWettering

Yesterday, I mentioned the idea of using the cheap ESP8266 as a clock source for a WSPR beacon transmitter. My initial idea was to basically write code for the Arduino that connected to a remote NTP server, formulate UDP packages… sounds like a pain. But then I found that there was alternative software I could […]