A few months ago I wrote about the process I was using to optimize my website files for SPIFFS prior to upload them to the ESP8266. The goal was to reduce the number and size of the files to help the microcontroller to cope with them in an easier way. Smaller size mean faster downloads and less files mean less concurrency. Continue reading →
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.
Some weeks ago I talked about the Magic Home LED Controller as I was adding support for it in my ESPurna firmware. At the time a user pointed me to the H801 Led WiFi Controller by Huacanxing. The user in question (Minh Phuong Ly) even did a pull request with some preliminary support for it. So I decided to give it a go.
The H801 is a 5 channels controller that you can find for about 9-10€ at Ebay or Aliexpress. It’s slighly more expensive than the Magic Home Led Controller (you can find the later for 7€ at Aliexpress) but it also is quite different from the insides…
There are so many ways to tell the time. DIYers have been doing clocks since the Ancient Egypt (obelisks lacked portability, thou). Every modern maker has a clock amongst her first projects. I have done some myself, including a fibonacci clock, a wordclock with a fancy green matrix effect and an unreleased project that hopefully will see the light someday soon.
But recently I came back to the idea behind the wordclock before, to extend it in different ways:
Replace the ATMega328P with an ESP8266 (NTP support and user interaction)
Smaller sizes (8×8 LED matrices)
Smaller PCB, less buttons
Add buzzer for alarms
Replace the 3D printed part with a wooden grid cut in laser
Completely closed enclosure, better presentation
Fix some issues with the original board (like the lack of a beefy capacitor across the LED matrix power lines).
After a busy month I decided to spend some energy on doing hardware instead of software and the result was the ESPurna board I posted about just yesterday. The goal was to have a device based on the ESP8266 I could fit into my house wall gangs, with an SPDT relay to work with multi-way switches and power monitoring using the same IC the Sonoff POW uses: the HLW8012.
As a side project today I’ve been searching on the box of the TODO projects and I have rescued a KEMO STG15 [Ebay] plug housing with socket. These sockets are somewhat expensive and really bulky but the good thing is that there is quite some room to fit some electronics inside, but not a Sonoff board, too big.