If you want a device that could measure your heart beat and plot its curve trace on an OLED display, then this will be your best guide.
Project tutorial by MEGA DAS
My project is a library for E32 LoRa (Long Range) device very cheap and long range (from 3Km to 8Km), to simplify usage and conf.
Project tutorial by Renzo Mischianti
An automatic bell for school. Ring when you want using an Android app.
Project in progress by wawawa
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