[Features]

• Compatible with nodemcu.
• 18650 charging system integration.
• The indicator LED (green means full, red means charging) can be used while charging.
• The switch controls the power supply.
• SMT connector can be used in sleep mode · 1 additional LED programmable (gpio16)
• 0.5A charging current
• 1A output
• Overcharge protection
• Over discharge protection
• 10 digital pin read/write/interrupt/PWM/I2C/line support (except D0)
• Be careful with analog input +-.

Note: If the battery is in the wrong direction, the charging chip will be damaged. 

1. ESP WROOM-02 x1