ESP32 Pin Mapping
(Note this is for the early hand-wired prototype only - As of Jan 2018 platform has moved to RPi Zero W)
| Pin | ESP32 Functions | RATT Usage | Function |
|---|---|---|---|
| GPIO0 | BUTTON/Tch1/ADC2_1/GPIO0/CLK1 | Bootloader | FTDI USB Serial to enable bootloader on reboot |
| GPIO1 | CLK3/GPIO1/U0_TXD | USB-Serial | UART0 TXD to FTDI USB Serial |
| GPIO2 | Tch2/HSPI_WP/ADC2_2/GPIO21/CS | SD Card | D0 (must be pulled low to go into download mode) |
| GPIO3 | CLK2/GPIO3/U0_RXD | USB-Serial | UART0 RXD from FTDI USB Serial |
| GPIO4 | Tch0/HSPI_HD/ADC2_0/GPIO4 | SD Card | D1 (not used in 1-line mode) |
| GPIO5 | GPIO5/V_SPI_CS0/LED | TFT Display | SPI Chip Select |
| GPIO6-11 | Not present | N/A | N/A |
| GPIO12 | TDI/Tch5/HSPI_Q/ADC2_6/GPIO14 | SD Card | D2 (not used in 1-line mode) - also JTAG |
| GPIO13 | TCK/Tch4/HSPI_D/ADC2_4/GPIO13 | SD Card | D3 (not used in 1-line mode) - also JTAG |
| GPIO14 | TMS/Tch6/HSPI_CLK/ADC2_6/GPIO14 | SD Card | CLK - also JTAG |
| GPIO15 | TDO/Tch3/HSPI_CS0/ADC2_3/GPIO15 | SD Card | CMD - also JTAG |
| GPIO16 | GPIO16/U2_RXD | RFID Reader | Serial RXD (ESP32 data in from RFID module) |
| GPIO17 | GPIO17/U2_TXD | I2S Audio | Codec DOUT |
| GPIO18 | SCK/GPIO18/V_SPI_CLK | TFT Display | SPI SCK |
| GPIO19 | MISO/GPIO19/V_SPI_Q/U0_RTS | TFT Display | SPI MISO |
| GPIO20 | Not present | N/A | N/A |
| GPIO21 | SDA/GPIO21/V_SPI_HD | I2C Bus | I2C SDA |
| GPIO22 | SCL/GPIO22/V_SPI_WP/U0_RTS | I2C Bus | I2C SCL |
| GPIO23 | MOSI/GPIO23/V_SPI_D | TFT Display | SPI MOSI |
| GPIO24 | Not present | N/A | N/A |
| GPIO25 | DAC1/ADC2_8/GPIO25 | I2S Audio | Codec WS/LRCLK |
| GPIO26 | DAC2/ADC2_9/GPIO26 | I2S Audio | Codec BCK |
| GPIO27 | Tch7/ADC2_7/GPIO27 | TFT Display | Data/Command |
| GPIO28-31 | Not present | N/A | N/A |
| GPIO32 | Tch9/ADC1_4/GPIO32/XTAL32 | TFT Display | Controller Reset |
| GPIO33 | Tch8/ADC1_5/GPIO33/XTAL32 | TFT Display | Backlight |
| GPIO34 | VDET1/ADC1_6/GPIO34 | GPIO input only/no internal pullup | |
| GPIO35 | VDET2/ADC1_7/GPIO35 | GPIO input only/no internal pullup | |
| GPIO36 | ADC1_0/GPIO36/SenseVP | Button 1 | GPIO input only/no internal pullup |
| GPIO37 | ADC1_1/GPIO37/CapVP | Button 2 | GPIO input only/no internal pullup |
| GPIO38 | ADC1_2/GPIO38/CapVN | Button 3 | GPIO input only/no internal pullup |
| GPIO39 | ADC1_3/GPIO39/SenseVN | Button 4 | GPIO input only/no internal pullup |
ESP32-Thing:
ESP32-WROOM module: (removed graphic due to bad pinouts)