My9R2TV5

Voltmeter and Ammeter

Overview

This voltmeter and ammeter uses an OLED screen, which reduces the number of I/O ports used by the CW32 microcontroller and allows for the extraction of redundant I/O ports for future improvements. It can be connected to a serial port for debugging, enabling the removal of source code from the microcontroller chip. It has JP1/JP2 functions to select whether to measure voltage and current, and buttons to select the measurement mode.
My code uses an OLED to display the voltage and current values. The OLED configuration is completed by defining SCL/SDA in the oled.h header file using the corresponding pins, and the digital tube display is replaced with an OLED display.

Design Files

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Update:2026-03-26 12:48:13

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