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Wire:
ESP32-WROOM-32: The metal can holds the ESP32 chip, 4 MB flash and the 40 MHz crystal. The top part is the PCB antenna — keep it clear of metal.ESP32-WROOM-32Antenna: Printed Wi-Fi/Bluetooth antenna.Micro-USB: Upload sketches, open the Serial Monitor and power the board (5 V).USB-UART: CP2102 or CH340 chip that turns USB into the ESP32's serial port.EN: Reset button (pulls EN low).BOOT: Holds GPIO0 low; press it while uploading if the upload tool can't enter boot mode.LED (GPIO2): Built-in blue LED on GPIO2 on most DevKit V1 boards.3.3 V regulator: AMS1117 regulator: 5 V → 3.3 V.ENVPVN34353233252627141213GNDVIN2322TX0RX02119185TX2RX24215GND3V3Pin EN (Chip enable — pull LOW to reset)Pin VP (ADC1_CH0, Sensor VP)Pin VN (ADC1_CH3, Sensor VN)Pin 34 (ADC1_CH6)Pin 35 (ADC1_CH7)Pin 32 (ADC1_CH4, Touch T9, 32 kHz crystal (optional))Pin 33 (ADC1_CH5, Touch T8)Pin 25 (ADC2_CH8, DAC1 (8-bit))Pin 26 (ADC2_CH9, DAC2 (8-bit))Pin 27 (ADC2_CH7, Touch T7)Pin 14 (ADC2_CH6, Touch T6, HSPI CLK)Pin 12 (ADC2_CH5, Touch T5, HSPI MISO, Strapping (MTDI: flash voltage))Pin 13 (ADC2_CH4, Touch T4, HSPI MOSI)Pin GND (Ground (0 V))Pin VIN (5 V input/output (USB 5 V))Pin 23 (VSPI MOSI)Pin 22 (I2C SCL (Arduino default))Pin TX0 (UART0 TX (USB serial))Pin RX0 (UART0 RX (USB serial))Pin 21 (I2C SDA (Arduino default))Pin 19 (VSPI MISO)Pin 18 (VSPI SCK)Pin 5 (VSPI SS, Strapping (SDIO timing))Pin TX2 (UART2 TX)Pin RX2 (UART2 RX)Pin 4 (ADC2_CH0, Touch T0)Pin 2 (ADC2_CH2, Touch T2, Built-in LED (most boards), Strapping (boot mode))Pin 15 (ADC2_CH3, Touch T3, HSPI SS, Strapping (boot log))Pin GND (Ground (0 V))Pin 3V3 (3.3 V output from the regulator)Push button · Side A (a)Push button · Side B (b)RELAYVCCGNDINCOMNONCRelay module (5 V) · VCC (vcc)Relay module (5 V) · GND (gnd)Relay module (5 V) · IN (in)Relay module (5 V) · COM (com)Relay module (5 V) · NO (no)Relay module (5 V) · NC (nc)330 ΩResistor · End 1 (a)Resistor · End 2 (b)+LED · Anode (+) (anode)LED · Cathode (−) (cathode)
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