############### ESP32-DevKitC-1 ############### The `ESP32-DevKitC-1`_ development board is one of Espressif's official boards. This board is based on the `ESP32-WROVER-E`_ module, with the `ESP32`_ as the core. Specifications -------------- - Wi-Fi 802.11 b/g/n (802.11n up to 150 Mbps) - Bluetooth v4.2 BR/EDR and BLE specification - Built around ESP32 series of SoCs - Integrated 4 MB SPI flash - Integrated 8 MB PSRAM - Peripherals - SD card - UART - SPI - SDIO - I2C - LED PWM - Motor PWM - I2S - IR - Pulse Counter - GPIO - Capacitive Touch Sensor - ADC - DAC - Two-Wire Automotive Interface (TWAI®, compatible with ISO11898-1) - On­board PCB antenna or external antenna connector Header Block ------------ .. note:: Not all of the chip pins are exposed to the pin headers. J1 ^^^ === ==== ===== =================================== No. Name Type Function === ==== ===== =================================== 1 3V3 P 3.3 V power supply 2 EN I CHIP_PU, Reset 3 IO36 I GPIO36, ADC1_CH0, S_VP 4 IO39 I GPIO39, ADC1_CH3, S_VN 5 IO34 I GPIO34, ADC1_CH6, VDET_1 6 IO35 I GPIO35, ADC1_CH7, VDET_2 7 IO32 I/O GPIO32, ADC1_CH4, TOUCH_CH9, XTAL_32K_P 8 IO33 I/O GPIO33, ADC1_CH5, TOUCH_CH8, XTAL_32K_N 9 IO25 I/O GPIO25, ADC1_CH8, DAC_1 10 IO26 I/O GPIO26, ADC2_CH9, DAC_2 11 IO27 I/O GPIO27, ADC2_CH7, TOUCH_CH7 12 IO14 I/O GPIO14, ADC2_CH6, TOUCH_CH6, MTMS 13 IO12 I/O GPIO12, ADC2_CH5, TOUCH_CH5, MTDI 14 GND G Ground 15 IO13 I/O GPIO13, ADC2_CH4, TOUCH_CH4, MTCK 16 IO9 I/O GPIO9, D2 17 IO10 I/O GPIO10, D3 18 IO11 I/O GPIO11, CMD 19 5V0 P 5 V power supply === ==== ===== =================================== J3 ^^^ === ==== ===== ==================================== No. Name Type Function === ==== ===== ==================================== 1 GND G Ground 2 IO23 I/O GPIO23 3 IO22 I/O GPIO22 4 IO1 I/O GPIO1, U0TXD 5 IO3 I/O GPIO3, U0RXD 6 IO21 I/O GPIO21 7 GND G Ground 8 IO19 I/O GPIO19 9 IO18 I/O GPIO18 10 IO5 I/O GPIO5 11 IO17 I/O GPIO17 12 IO16 I/O GPIO16 13 IO4 I/O GPIO4, ADC2_CH0, TOUCH_CH0 14 IO0 I/O GPIO0, ADC2_CH1, TOUCH_CH1, Boot 16 IO2 I/O GPIO2, ADC2_CH2, TOUCH_CH2 17 IO15 I/O GPIO15, ADC2_CH3, TOUCH_CH3, MTDO 17 IO8 I/O GPIO8, D1 18 IO7 I/O GPIO7, D0 19 IO6 I/O GPIO6, SCK === ==== ===== ==================================== P: Power supply; I: Input; O: Output; T: High impedance. Pin Layout ---------- .. figure:: ../_static/esp32_devkitC_pinlayout.png :align: center :width: 600 :alt: ESP32-DevKitC-1 (click to enlarge) :figclass: align-center Strapping Pins -------------- Some of the GPIO's have important features during the booting process. Here is the list of the strapping pins on the `ESP32`_. ==== ========= ===================================================================== ============ ============== GPIO Default Function Pull-up Pull-down ==== ========= ===================================================================== ============ ============== IO12 Pull-down Voltage of Internal LDO (VDD_SDIO) 1V8 3V3 IO0 Pull-up Booting Mode SPI Boot Download Boot IO2 Pull-down Booting Mode Don't Care Download Boot IO15 Pull-up Enabling/Disabling Log Print During Booting and Timing of SDIO Slave U0TXD Active U0TXD Silent IO5 Pull-up Timing of SDIO Slave See `ESP32`_ See `ESP32`_ ==== ========= ===================================================================== ============ ============== Be aware when choosing which pins to use. Restricted Usage GPIO's ----------------------- Some of the GPIO's are used for the external flash and PSRAM. These GPIO's cannot be used: ==== =================== GPIO Shared Function ==== =================== IO6 External SPI Flash IO7 External SPI Flash IO8 External SPI Flash IO9 External SPI Flash IO10 External SPI Flash IO11 External SPI Flash ==== =================== Other GPIO's are `INPUT ONLY` and cannot be used as output pin: ==== ========================= GPIO Function ==== ========================= IO34 GPIO34, ADC1_CH6, VDET_1 IO35 GPIO35, ADC1_CH7, VDET_2 IO36 GPIO36, ADC1_CH0, S_VP IO39 GPIO39, ADC1_CH3, S_VN ==== ========================= Resources --------- * `ESP32`_ (Datasheet) * `ESP32-WROVER-E`_ (Datasheet) * `ESP32-DevKitC`_ (Schematic) .. _ESP32: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf .. _ESP32-WROVER-E: https://www.espressif.com/sites/default/files/documentation/esp32-wrover-e_esp32-wrover-ie_datasheet_en.pdf .. _ESP32-DevKitC: https://dl.espressif.com/dl/schematics/esp32_devkitc_v4-sch.pdf