1 Ground 2 3V3 3 3V3 4 RST 5 Ground 6 GPIO4 FSPIHD MTMS ADC1 CH4 7 GPIO5 FSPIWP MTDI ADC2 CH0 8 GPIO6 FSPICLK MTCK 9 GPIO7 FSPID MTDO 10Ground 11GPIO8* RGB LED 12GPIO9* 135V0 145V0 15Ground 1Ground 2GPIO0 ADC1 CH0 XTAL 32K P 3GPIO1 ADC1 CH1 XTAL 32K N 4GPIO2* ADC1 CH2FSPIQ 5GPIO3 ADC1 CH3 6Ground 7GPIO10 FSPICS0 8Ground 9GPIO20 UART0 RXD 10GPIO21 UART0 TXD 11Ground 12GPIO18 USB D- 13GPIO19 USB D+ 14Ground 15Ground
PinFunctionNotes GPIO8Addressable RGB LED GPIO2, 8 & 9Strapping pinsGPIO2, GPIO8, and GPIO9 double as strapping pins for the ESP32-C3 chip. SPI Boot mode: GPIO2 high, GPIO8 any, GPIO9 high UART / USB Serial JTAG Download: GPIO2 high, GPIO8 high, GPIO9 low.
