OLED’s SDA and SCL connected to the D1 pin and the D2 pin respectively. One switch controls whether the 18650 battery is powered or not.Integrated 18650 battery charging and discharging system.3000 mA 18650 It is possible to operate for more than 17 hours on a battery.LED: Red = Charging, Green = Full charging.Overcharge protection, over-discharge protection built in.18650 charging circuit including the 5V boosting circuit with TP5410.Operation and charging are possible at the same time.There is a SOLDER terminal for SLEEP MODE.Analog Input (AD): Built-in dividing resistor (AD = 220K – ADC – 100K = GND).AUTO PROGRAM circuit.ESP8266 (ESP-WROOM-02 With TELEC) is equivalent to the NodeMCU.If the battery is in the wrong direction, the charging chip will be destroyed.10 digital pin read/write/interrupt/PWM/I2C/line support (except D0).SMT connector can be used for sleep mode.The indicator LED (green means full red means charging) can be used while charging.Compatible with nodemcu 18650 charging system integration.
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