Electronic load meter V1.2

Introduction

Low-power electronic load meter based on ESP32+INA226; supports DC, TYPE C, and 4-wire interfaces; TYPE C supports decoy 9V, 12V, 15V and 20V; the maximum input voltage is less than 30V, and the long-term load power is about 40W.

structure

1. One motherboard

2. One piece of front panel

3. One piece of rear panel

4. One power interface board

characteristic

• Based on ESP32-PICO-D4 chip, using INA226 for voltage, current and power measurement
• Adopts 0.96 TFT display to display voltage, current, power and capacity
• Temperature monitoring, the fan will automatically turn on for heat dissipation when the temperature is greater than the preset temperature, and the load will be automatically turned off when the alarm temperature is exceeded.

BUG:

  1. The power supply and ground connection of the 4 op amp chip are reversed. V1.2 has been corrected.

  2. The CH224K power supply capacitor is connected in the wrong position, V1.2 has been corrected

Code description

To be improved

Accessories link

• 20mm high step 4 wire speed regulating radiator
• Aluminum shell