I’m having some busy weeks again and the blog is suffering from my absence 🙂 I had a bunch of comments to accept (please remember all comments are being moderated). And even more projects pending (including a new version of the ESPurna firmware). But I just wanted to let you know that I will be at the Barcelona Maker Faire next June 17 & 18.
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).
Last February 7 I attended a workshop at a the SokoTech in Barcelona to assemble my own Fenderino, the coolest guitar ever (my knowledge about guitars is very limited, so take this sentence with a grain of salt).
The guitar is actually a shield for the Arduino UNO and has been designed by the people at abierto.cc, an initiative aimed to provide open(-sourced) tools for educators, created amongst others, by David Cuartielles, co-founder of Arduino. The shield is inspired by the works of two very good friends of mine: Marc Sibila (@marcsibila) and Jordi Divins (@jdivins). You really should be following these guys, they are doing very special things as Instròniks.
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.
If you have read me, you might know I have a firmware for ESP8266-based smart switches called ESPurna. The firmware integrates with Alexa, Domoticz, Home Assistant and about any other service that supports MQTT or HTTP REST APIs. It supports a variety of devices, including almost the whole Sonoff family by Itead Studio, but also some other commercially available boards and light bulbs, and open source hardware projects as well.
But sometimes you just don’t find the proper hardware for your specific case. Maybe it doesn’t expose enough GPIOs, maybe it’s short of analog ports, maybe you need a double-throw relay,… Sometimes we manage to work around these limitations of the hardware adding peripherals or using a thin iron tip. But other times the problem is that it just doesn’t fit.
And size was the main reason I started creating my own smart switch board.