Simple USB voltage and ammeter (ESP32+INA226)

Introduction

USB voltage and ammeter based on ESP32-PICO-D4+INA226, using USB A head, with CC pin, supports PD fast charging; focus: ultra-thin, simple

structure

Two-layer PCB board, installed through 2.5mm high M1.4 welded copper pillars, the total height after assembly is 5.3mm

characteristic

• Based on ESP32-PICO-D4 chip, using INA226 for voltage and current measurement
• Adopts 0.96 TFT display to display voltage, current, power and capacity
• Input and output use USB A head with CC pin, supporting PD fast charging

Code description

The software is an Arduino project, developed based on LVGL. The code is very rudimentary and the interface is very simple. Let’s see if any netizens are interested in improving it. You can consider developing PC software to record the charge and discharge curves.

Release Notes

V1.1: USB CC pin reserves 5.1K pull-down resistor

Download instructions

You need to equip a USB to serial download cable and solder it to the reserved pad on the board.

Accessories link

• 2.5mm high M1.4 welded copper pillar
• M1.4*3.5 small screw
• 5P USB Type A sinking board patch male header
• 5P USB Type A sinking board patch female header

Plate thickness 1.6mm

The thickness of the outer frame PCB board is 1.2mm. The two free samples of the month have been used up, so we can only go to other places for printing. Only the green color is free. . . , change it to black next time