Lemon-Pill is a custom STM32L412 based board.The PCBs offered here can be used for educational purposes, as an evaluation board, or for various other purposes.

Lemon-Pill can be programmed by ArduinoIDE, STM32CubeIDE, or without any IDE at all.

The idea behind it is to teach people how to use and program microcontrollers that are not Arduino and are vastly different in how they work in the lower level.

This is my very first board and every component has been hand soldered. Lemon-Pill is a microcontroller board based on STM32L412. It has 30 general purpose input/output pins, an 8 MHz HSE crystal oscillator, a 32.768 KHz LSE crystal oscillator, a 2032 coin cell battery holder, a bootloader selection switch, a reset button, a USB connection and a user LED on PC13 gpio. Connect it to the PC to start using it.

Lemon-Pill can be easily programmed through USB, with ArduinoIDE, by setting the bootloader switch to ON and then selecting DFU upload method. It can be programmed with STM32CubeProgrammer by following the same method. For debugging an external debugger like STLink or BMP is required.

Feel free to look around and message if you need assistance. For more information you can take a look at the Lemon-pill wiki