Wemos ESP-WROOM-02 WiFi module with ESP8266 on battery

The development board integrates the ESP8266 and 18650 batteries. A standard 18650 battery can last up to 17 hours.

Caution: If the battery is reversed, the charging chip will be destroyed

Technical parameters:

- integrated 18650 battery charging system

- LED indicator - green - fully charged, red - charging in progress

- it can work and charge at the same time

- 1x power switch

- 1x SMT connector for sleep mode

- charging current: 0.5A

- output current: 1A

- overload protection

- 10 digital pins

- PWM, I2C support

- 1x analog input

Function:

- AD imput

- micro USB imput

- programmable LED (D0)

- AUTO PROGRAM.ESP8266 circuit (ESP-WROOM-02 S TELEC), equivalent to NodeMCU

- analog input (AD): Built-in dividing resistor (AD = 220K – ADC – 100K = GND)

- a SOLDER terminal is available for sleep mode

- compatible with Arduino and NodeMCU

- operation and charging are possible simultaneously

- 18650 charging circuit including 5V boost circuit with TP5410

- built-in overcharge protection

- LED: red = charging, green = full charging

- integrated 18650 battery charging and discharging system

- one switch controls whether the 18650 battery is powered or not

- SLEDOLED and SCL connected to pins D1 and D2

- 5 buttons are controlled by FLASH, RESET, D5, D6 and D7

- 5 digital pins can configure stand-alone writable / writable / interruptible / PWM / I2C / single wires

- operation and consistent NodeMCU, by adding a programmable LED, you can use GPIO16 to control, display the operating status of the 8266 and other functions.

- integrated OLED and five buttons, more convenient for development

- the design concept is based on the NodeMCU open source project and the development board integrates 18650 charging and discharging systems with charge and discharge protection

- at the same time, OLEDs and five directional buttons are integrated to facilitate development.

curriculum:

https://www.instructables.com/How-to-Use-Wemos-ESP...