USB tester ammeter and voltmeter 0.96 expansion board supports RP2040 and ESP32-C3

Here's a brief overview of the functions; a detailed explanation and usage instructions will be provided later if needed.

The PCB is compatible with the official Raspberry Pi RP2040 and the Heze ESP32-C3; both boards are available for 9.9 yuan.
When using with the RP2040, the solder point marked PI on the PCB needs to be shorted to the center point; the opposite applies to the ESP32-C3.
Modeled after the Heze 0.96-inch expansion board, it supports a five-way navigation key or a single button.
It supports writing I2C commands via serial port, reading, writing, dumping, I2C scanning, and delayed operations, and supports both 1.8V and 3.3V levels.
It supports QC2.0/QC3.0 voltage regulation and can output 5V and 12V with one button. Note that the power input must be connected to the LCD for this to work.
It supports serial port programmable voltage output, adjustable range 3.6-20V, accuracy 0.2V (determined by the QC protocol, 0.2/Step). Voltage output and adjustment are determined by the charging adapter.
Power is connected to the LCD via Type-C. C. Automatically enters voltmeter mode; when connected to the MCU, it automatically enters I2C tool mode.
Currently, testing at 25W 3A has no issues; theoretically, the maximum testable current is 11A (actually around 5A), and the maximum voltage is 30V.
The ESP32C3 supports client mode, allowing adjustment of the output voltage via TCP wireless serial connection. The wireless name is "meter," and the password is "1234567890." After flashing the firmware, connect to the main router within 15 seconds, then use its IP address, port 9876, and login address 192.168.4.1. Due to I/O port limitations, R4, R17, and R20 need to be disconnected, as indicated in the diagram below.