w806+INA226 power meter_small_v2.0

Written in front: This project can only be used as a reference. There are still many unreasonable things in the design. You can leave comments below and we will revise it when we have time.

CSDN documentation:

https://blog.csdn.net/qq_37280428/article/details/121495410?spm=1001.2014.3001.5501

Github address:
https://github.com/xiansenzhao/w806_ina226_project

The main control is Lianshengde's W806. The main frequency is 240MHZ. The peripherals are basically available, but the official is still working on the follow-up information.

At that time, this microcontroller attracted me because its main frequency was 240Mhz, so I chose this microcontroller. The price was about five yuan or six yuan.

It is a bit luxurious to use this main control with just a power meter. There is a CH340N circuit designed, which can directly use USB to download the program. It also has a self-reset circuit designed so that frequent reset keys are not needed. The 806 has its own ADC, but I think it is not very reliable, so the cost of the external expansion solution may be less than 20.

USB3.0 interface.

Input voltage: 4.5-36.
Measuring current: 0-5A. PS -- I have not actually tested it. I have only done the actual test of 2A for one hour. 5A does not have the conditions, so there is no way.

Main control: W806

Display: 0.91OLED (IIC)

Voltage and current: INA226 (IIC)

These two peripherals can actually use one IIC, but I designed them separately.

Problems in design:

1. When welding, I encountered a situation where the output voltage was abnormal when the load was not connected to the power supply, but everything was normal when the load was connected, so if you have a reference design, please pay attention to this problem.

Engineering revisions:

2021-12-4. V2.1: In this version, the mini-USB data cables D+ and D- of the serial port are directly connected to the input USB interface of the coulomb counter. There is no need to insert a separate USB download cable to download the update program. Simply plug the coulomb counter into the USB port of your computer.