Build My Ampere Meter

Use STM32 and INA226 to build a ampere meter for myself，which could measure ±25A within 0.3% error. The INA260 version is on his way.

sushisongren

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Description

I started the project since 2019.6. I use Arduino as my controller at first beacause I don't want to write the driver of INA226&SSD1306. However I found out that the Arduino need a 5V to power it. As a Li-on battery powered project, it means I need to add a boost to this project, which adds more BOM and not very efficiency.
So when restart the project in this summer, I decided to use STM32F401. Here in China, I can buy it from XianYu(something like ebay) for a ultra low price(2 yuan for each MCU). I also made a lovely Core Board for it.(https://hackaday.io/project/171248-build-my-own-stm32-core-board)
This project is almost finished, and I don't have time to write a GUI for it. You can build your own GUI for it.

Details

As you can see, the small current measurement is not quite accurate, but it still meet my error rate. I think you can install a larger Rshunt to get more accuracy in small current measurement.

Components

1 × STM32F401CCU6 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × INA226 Power Management ICs / Power Supply Support
1 × INA260
1 × AMS1117 Power Management ICs / Linear Voltage Regulators and LDOs