Hi !

I remembered this simple project I made for myself, you can use it with an ATMega32 or ATMega16 microcontroller. As I only had 1 microcontroller I tried a semi-professional PCB manufacturing version, and it came out a 10. I don't usually buy PCBs when I know I only need 1 piece, the costs clearly exceed the need. The components are largely recovered, except for the MCU and the 32pF capacitors.

I made a simpler version, giving up the programming circuit via USB and other components like voltage regulator, resulting in a PCB that just allows us access to the GPIO of the MCU. There is also a red LED indicator on the PCB for voltage, but nothing else.

For microcontroller programming, you can use a method similar to that of Arduino platforms, load a bootloader in the microcontroller, and with an FT232RL TTL to USB adapter you can program the microcontroller very easily, as it is done on Arduino boards. You can also use an AVR USB-ASP programmer. There are numerous tutorials on the internet using the Arduino IDE.

Enjoy it!

Bill of materials available in the download section, circuit diagram as well.