Last month I bought an interesting RGB LED ring from Aliexpress and finally, now, it is here. So that, I’m about to present how I interfaced an STM32 MCU to WS2812B LEDs. This demo uses also FreeRTOS and HAL libraries. I wrote a simple code to make an STM32 interface WS2812B LEDs.
When a laptop battery dies, often not all the elements that compose it are to be thrown away. The power management circuit or only few LiPo batteries can be broken. Commonly, a 18650 battery is quite expensive but is really simple to give those batteries a new life and enjoy not pollute the planet.
In this article I describe how to connect a positive and a negative wire to 18650 batteries without the need to buy a dedicated holder.
With some free time (and an unused GPS module) I decided to realize a GPS and temperature logger. It can be used for example to check if a good was moved through the right path and within a given temperature range.