A few months ago I wrote about the Sonoff SC sensor hub by Itead Studio. It’s a device with a Sharp GP2Y1010AU0F [Aliexpress] dust sensor, a DHT11 humidity and temperature sensor, an LDR as light sensor and a mic. The sensors are driven by an ATMega328P microcontroller but there is also an ESP8266 on board for WiFi communication, a pretty standard set up when you have several sensors and the ESP8266 GPIOs are just not enough.
On the first post I already did a small mod to replace the DHT11 humidity and temperature sensor with a more accurate and pin compatible DHT22. Since then, several readers have contributed with code and ideas. My progress implementing and testing them is slow, so I though about writing a first post about some modifications I (and others) have done to the device.
So this is a work in progress post. At the moment, all the code for these modifications is in the dev branch of the repository.
This custom Sonoff SC firmware is released as free open software and can be checked out at my SonoffSC repository on Github.
Clocks are top projects for the maker community. There are tons of different ways to show or tell time. Or write time. Wordclocks are a subset of them by its own. You can find other wordclocks at instructables, for instance, or buy one from thinkgeek or from a local jewelry for just 450€. Mmm… well maybe that’s a little bit on the expensive side…
Recently I’ve been doing things with clocks and WS2812 LEDs (a.k.a. NeoPixels). My interest started with Philippe Chrétien’s Fibonacci Clock campaign at Kickstarter. I thought: “Wow! That’s cool AND freaking freak! I want one”. But the $100 and the instructable he himself had done before about building your own made me decide to try it. Anyway, that’s a different story.
That project led to this one. Because suddenly I happened to have 9 spare boards with an atmega328, an RTC, an SDCard slot, some nice buttons and the circuitry to drive a bunch of NeoPixels. I also happened to have a couple of LED matrices (you know, the kind of stuff you have in your bedroom drawer). So first I built a clone of the The Game Frame Pixel Art Project. It was great and my kids loved the pixelart. But I’m not going to talk about that project either.