USB voltage and current meter (ESP32+INA226) C port V1.1

Introduction

USB voltage and ammeter based on ESP32-PICO-D4+INA226, using TYPE C male and female connectors; touch button to switch display direction; 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, which can display voltage, current, power and capacity (WH)
• The input adopts TYPC male connector and the output adopts TYPE C female connector.
• Currently only 5A is measured, the board will be a little hot.

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: Optimized wiring and added window opening

Download instructions

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

Essential tools

• soldering iron, heated soldering station
• file

Accessories link

• 2.5mm high M1.4 welded copper pillar
• M1.4*3.5 small screw
• TYPE C male connector
• 0.96 display
• 8P FPC 0.5MM flip connector

other instructions

• The TYPE C male connector has no positioning holes, and the pin spacing is smaller than that of the female connector, making it not very easy to weld.
• I originally wanted to use an independent touch chip on the panel for the touch button. Later, I tried to use the touch pin of ESP32 to connect it. It also works, but the sensitivity is not that good after passing the flying wire. In addition, there is also a touch button reserved on the back of the base plate.

Plate thickness 1.6mm

Outer frame PCB board thickness 1.2mm

When welding copper pillars, use a file to flatten the protruding solder legs. If you don’t want to be so troublesome, leave a hole in the panel.

Solder the wires of the touch buttons. I originally wanted to use POGOPIN, but one costs 2 yuan and 8 yuan for shipping. It is not cost-effective. I will use wires instead for the time being.