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Microcontroller
SparkFun Thing Plus ESP32 WROOM USB-C
A Feather-compatible ESP32 board with Qwiic, microSD, USB-C, Wi-Fi, Bluetooth, and battery support.
Processor
ESP32-WROOM
Logic
3.3 V GPIO
Power
USB-C, LiPo connector, 3.3 V rail
Format
Feather-compatible Thing Plus
Check before wiring
- GPIO0 is the boot button signal; GPIO2, GPIO5, GPIO12, and GPIO15 need valid reset-time strap levels.
- ESP32 ADC2 limitations still apply when Wi-Fi is active.
- Check microSD and Qwiic shared buses before assigning pins.
Interfaces
GPIOI2CSPIUARTADCDACPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
Feather-compatible side 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.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- All ESP32 GPIO uses 3.3 V logic and is not 5 V tolerant.
- GPIO0 is the boot button signal; GPIO2, GPIO5, GPIO12, and GPIO15 are boot-strapping-sensitive pins.
- ADC2 pins cannot be used for analog conversion while Wi-Fi is active; microSD chip select is GPIO5.
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| Left header | ||||
| 1 | I2C | I2C | ||
| 2 | I2C | I2C | ||
| 3 | ADC | |||
| 4 | ADC | |||
| 5 | Alt | Strapping / Touch 3 | ||
| 6 | ADC | |||
| 7 | ADC | |||
| 8 | Alt | Strapping / ADC2 CH5 | ||
| 9 | GPIO | |||
| 10 | Power | VUSB | ||
| 11 | System | |||
| 12 | Power | VBAT | ||
| Right header | ||||
| 1 | ADC | |||
| 2 | UART | UART | ||
| 3 | UART | UART | ||
| 4 | SPI | SPI | ||
| 5 | SPI | SPI | ||
| 6 | SPI | SPI | ||
| 7 | ADC | |||
| 8 | ADC | |||
| 9 | ADC | |||
| 10 | ADC | |||
| 11 | DAC | ADC2 CH8 | ||
| 12 | DAC | ADC2 CH9 | ||
| 13 | Ground | GND | ||
| 14 | Reserved | |||
| 15 | Power | 3V3 | ||
| 16 | System | |||
Why it matters
- SparkFun's guide covers the USB-C variant and hardware overview.
- Practical for IoT prototypes that need battery and microSD.
- Feather compatibility makes it easy to compare with Adafruit boards.
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