This circuit can be powered by lithium battery, charged by USB, and displays the charging status through LED. You can control the LED on and off, relay closure, and RGB color through the wifi module. The onboard OLED display, buttons, power monitoring and other functions have strong expansion capabilities. After all functions are finally realized, all source codes will be uploaded for everyone to use. Everyone is welcome to learn and communicate together!
! ! ! The sht30 and esp8266 module circuits are incorrect and the schematic diagram has been modified. Everything else is normal at the moment. I will re-draw the board and modify the proofing when I have time.
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