GPIO2 = internal LED
GPIO7 (pin D13) dihubungkan ke buzzer
| Wemos D1/ NodeMCU  | ESP8266 Pin | Functions | 
|---|---|---|
D0 | 16 | GPIO | 
D1 | 5 | GPIO, I2C SCL | 
D2 | 4 | GPIO, I2C SDA | 
D3 | 0 | GPIO | 
D4 | 2 | GPIO | 
D5 | 14 | GPIO, SPI SCK (Serial Clock) | 
D6 | 12 | GPIO, SPI MISO (Master in, Slave out) | 
D7 | 13 | GPIO, SPI MOSI (Master out, Slave in) | 
D8 | 15 | GPIO, SPI SS (Slave select) | 
A0 | A0 | Analog in, via ADC | 
RX | 3 | Receive | 
TX | 1 | Transmit | 
