GSM Ai-Thinker A9 module with custom firmware Let's discover the A9 GSM module and the possibility to flash it with a custom firmware!
ATtiny MicroNucleus bootloader upgrade The ATtiny85 MicroNucleus boards are often delivered with some old bootloader. Let's try to upgrade them!
PIR PIR sensors: HC-SR501 Some specifications and tests around the most popular PIR sensor on AliExpress (with low power consumption in mind).
ATtiny ATtiny85 development boards There is a lot of ATtiny dev boards out there. Let's compare them quickly.
module JDY-08 : bluetooth 4.0 module The JDY-08 BLE module is cheap and not very well documented. It's mandatory to update it before unleashing it's power!
