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Microcontroller · Development Board
ESP32-S2-DevKitM-1
Espressif's MINI-module ESP32-S2 board: 42 broken-out pins with 14 touch channels, two DACs, and the widest analog coverage of the S2 kits.
Processor
ESP32-S2-MINI-1/1U or MINI-2/2U
Logic
3.3 V GPIO
Power
Micro-USB, 5 V header, or 3.3 V header (mutually exclusive)
Format
Breadboard dev kit, 21-pin headers
Check before wiring
- GPIO26 sits in the GPIO26-32 flash/PSRAM range. On ESP32-S2-MINI-2/2U boards, which carry 2 MB PSRAM, treat it as unusable — the module variant is not printed on the header.
- GPIO46 is input only and fixed pull-down; it cannot drive a load.
- GPIO0, GPIO45, and GPIO46 are strapping pins; GPIO0 and GPIO46 together select boot mode at reset.
- The Micro-USB port goes through a USB-to-UART bridge, so GPIO19/GPIO20 (USB D-/D+) are free on the header rather than wired to that connector.
- GPIO18 also drives the addressable RGB LED, so anything wired to it fights the LED driver.
- 3V3, 5V, and the Micro-USB port are mutually exclusive supplies.
- The ESP32-S2 has no Bluetooth radio — Wi-Fi only.
- IO pins are 3.3 V logic — do not drive them from a 5 V source.
Interfaces
GPIOI2CSPIUARTADCDACPWMUSBWi-FiJTAG
Source-backed connector
Interactive pin map
Pin map
Connector
ESP32-S2-DevKitM-1 J1/J3 headers
USB at the bottom, component side up, headers on both edges
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- Positions 1-21 are J1 pins 1-21; positions 22-42 are J3 pins 1-21.
- Espressif: "GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses." GPIO26 is broken out here — treat it as unavailable on ESP32-S2-MINI-2/2U boards, which carry 2 MB PSRAM.
- Espressif: "GPIO0, GPIO45, and GPIO46 are strapping pins." GPIO0 and GPIO46 together select boot mode at reset.
- Espressif: "GPIO46 is fixed to pull-down and is input only." It cannot drive anything.
- GPIO19 and GPIO20 are the chip's USB D-/D+ pads, but the Micro-USB port reaches the chip through a USB-to-UART bridge, so they are free on the header.
- 3V3, 5V, and the Micro-USB port are mutually exclusive supplies; do not feed two at once.
All 42 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Power | 3V3 | ||
| 2 | System | Strapping / BOOT / RTC_GPIO0 · Strapping pin; held low at reset by the Boot button. | ||
| 3 | ADC | ADC1_CH0 / TOUCH1 / RTC_GPIO1 | ||
| 4 | ADC | ADC1_CH1 / TOUCH2 / RTC_GPIO2 | ||
| 5 | ADC | ADC1_CH2 / TOUCH3 / RTC_GPIO3 | ||
| 6 | ADC | ADC1_CH3 / TOUCH4 / RTC_GPIO4 | ||
| 7 | ADC | ADC1_CH4 / TOUCH5 / RTC_GPIO5 | ||
| 8 | ADC | ADC1_CH5 / TOUCH6 / RTC_GPIO6 | ||
| 9 | ADC | ADC1_CH6 / TOUCH7 / RTC_GPIO7 | ||
| 10 | ADC | ADC1_CH7 / TOUCH8 / RTC_GPIO8 | ||
| 11 | ADC | ADC1_CH8 / TOUCH9 / FSPIHD | ||
| 12 | SPI | SPI | FSPICS0 / FSPIIO4 / ADC1_CH9 / TOUCH10 | |
| 13 | SPI | SPI | FSPID / FSPIIO5 / ADC2_CH0 / TOUCH11 | |
| 14 | SPI | SPI | FSPICLK / FSPIIO6 / ADC2_CH1 / TOUCH12 | |
| 15 | SPI | SPI | FSPIQ / FSPIIO7 / ADC2_CH2 / TOUCH13 | |
| 16 | SPI | SPI | FSPIWP / FSPIDQS / ADC2_CH3 / TOUCH14 | |
| 17 | ADC | ADC2_CH4 / U0RTS / XTAL_32K_P | ||
| 18 | ADC | ADC2_CH5 / U0CTS / XTAL_32K_N | ||
| 19 | DAC | DAC_1 / ADC2_CH6 / U1TXD | ||
| 20 | Power | 5V | ||
| 21 | Ground | GND | ||
| 22 | Ground | GND | ||
| 23 | System | CHIP_PU | ||
| 24 | System | Strapping · Input only and fixed pull-down; with GPIO0 it selects boot mode. | ||
| 25 | System | Strapping · Strapping pin, pulled down at reset. | ||
| 26 | UART | UART | U0RXD / CLK_OUT2 | |
| 27 | UART | UART | U0TXD / CLK_OUT1 | |
| 28 | Debug | JTAG | MTMS | |
| 29 | Debug | JTAG | MTDI / CLK_OUT1 | |
| 30 | Debug | JTAG | MTDO / CLK_OUT2 | |
| 31 | Debug | JTAG | MTCK / CLK_OUT3 | |
| 32 | SPI | SPI | FSPIWP | |
| 33 | SPI | SPI | FSPIQ / SPIDQS | |
| 34 | SPI | SPI | FSPICLK / SPIIO7 | |
| 35 | SPI | SPI | FSPID / SPIIO6 | |
| 36 | SPI | SPI | FSPICS0 / SPIIO5 | |
| 37 | SPI | SPI | FSPIHD / SPIIO4 | |
| 38 | Reserved | SPICS1 · In the GPIO26-32 flash/PSRAM range; unusable on PSRAM modules. | ||
| 39 | GPIO | RTC_GPIO21 | ||
| 40 | Alt | USB_D+ / ADC2_CH9 / U1CTS | ||
| 41 | Alt | USB_D- / ADC2_CH8 / U1RTS | ||
| 42 | DAC | DAC_2 / ADC2_CH7 / U1RXD / RGB LED · Also drives the on-board addressable RGB LED. |
Why it matters
- Official Espressif header tables give every J1/J3 pin and function.
- GPIO1-GPIO14 are capacitive touch channels TOUCH1-TOUCH14 as well as ADC inputs.
- Two true DAC outputs, DAC_1 on GPIO17 and DAC_2 on GPIO18.
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