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Microcontroller
LOLIN S2 Mini
An ESP32-S2 in the D1 Mini footprint, with native USB and many more GPIOs.
- GPIO
- I2C
- SPI
- UART
- ADC
- DAC
- PWM
- USB
- Wi-Fi
- Processor
- ESP32-S2FN4R2 single-core Xtensa LX7
- Logic
- 3.3 V GPIOTreat as not 5 V tolerant
- Power
- USB-C or 5 V/3.3 V pins
- Format
- D1 Mini footprint with extra inner pin rows
Before you wire
3 cautions- No Bluetooth on ESP32-S2.
- GPIO0 is the boot-strap pin (onboard button 0); USB CDC must be enabled in firmware or the serial port disappears.
- Shield compatibility only holds for the outer D1-style rows; inner rows are S2-specific.
Pin map
Connector
2×8 outer headers + 2×5 inner headers
Signals grouped by function — schematic layout, not to physical scale
Dense header — open Full view for a roomier, fully-labelled diagram.
Simplified diagram, grouped by function — not to physical scale. Pin data is source-backed; verify against the linked documentation.
Pin
Hover, tap, or arrow to a pad to inspect it.
- Outer rows are D1 Mini-footprint compatible; inner rows expose additional ESP32-S2 GPIOs.
- GPIO0 is the boot-strap / BOOT button pin — LOW at reset enters download mode.
- No Bluetooth on ESP32-S2; native USB-OTG on GPIO19/20 requires CDC enabled in firmware.
- ADC2 (GPIO11–GPIO17) conflicts with Wi-Fi — use ADC1 (GPIO1–GPIO10) for reliable reads.
- GPIO is 3.3 V only.
All 26 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Left outer row | ||||
| 1 | System | |||
| 2 | Power | 3V3 | ||
| 3 | SPI | SPI2 | SPI2 CLK / D5 compat | |
| 4 | SPI | SPI2 | SPI2 MISO / D6 compat | |
| 5 | SPI | SPI2 | SPI2 MOSI / D7 compat | |
| 6 | Alt | SPI2 CS / D8 compat; check boot strapping. | ||
| 7 | GPIO | |||
| 8 | GPIO | |||
| Right outer row | ||||
| 9 | UART | UART0 | UART0 TX | |
| 10 | UART | UART0 | UART0 RX | |
| 11 | I2C | I2C | I2C SDA / D2 compat | |
| 12 | I2C | I2C | I2C SCL / D1 compat | |
| 13 | GPIO | |||
| 14 | GPIO | |||
| 15 | Ground | GND | ||
| 16 | Power | 5V | ||
| Left inner row | ||||
| 17 | Power | 5V | ||
| 18 | ADC | ADC2 — avoid when Wi-Fi active. | ||
| 19 | ADC | ADC2 — avoid when Wi-Fi active. | ||
| 20 | ADC | ADC2 — avoid when Wi-Fi active. | ||
| 21 | GPIO | |||
| Right inner row | ||||
| 22 | SPI | SPI3 | SPI3 MOSI | |
| 23 | SPI | SPI3 | SPI3 MISO | |
| 24 | SPI | SPI3 | SPI3 CLK | |
| 25 | GPIO | |||
| 26 | GPIO | |||
Source references
Why it matters
- Compatible with many D1 Mini shields on the outer rows.
- Native USB-OTG enables CDC, HID, and DFU without a bridge chip.
- 27 GPIOs in a thumb-sized board.
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