TP4056 Li-ion charger with protection with ESP32

Supply 5 V Bus GPIO

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
IN+	Not wired to the ESP32	—	5 V input (or the USB connector)
IN-	Ground	GND	Input ground
B+	Not wired to the ESP32	—	To the cell +. One 3.7 V Li-ion / LiPo cell only
B-	Not wired to the ESP32	—	To the cell -. Not the same as GND: protection sits in between
OUT+	Not wired to the ESP32	—	3.0 to 4.2 V to the load. Too low for VIN: use an LDO or a boost to 5 V
OUT-	Ground	GND	Load ground: to the ESP32 GND

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.

NanJing Top Power TP4056 datasheet, Charge to 4.2 V; current set by RPROG (1.2 kΩ = 1 A)
Fortune DW01A datasheet, Over-discharge, over-charge and over-current protection

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.