The voltmeters that [Tom] bought used a 8 bit STM8S003F3P6 microcontroller. He reverse engineered the device and re-created the schematic to find out where the I2C and programming pins would be.

Meet the Raspberry Pi Pico 2 W, a tiny board designed around a microcontroller that lets you build hardware projects at scale. Raspberry Pi is once again using the RP2350, its own well-documented ...

Top seven vendors in the global microcontroller market Cypress Semiconductor Cypress Semiconductor designs, develops, manufactures, and markets programmable and mixed-signal solutions globally.