SparkFun ESP32 Thing

Specifications

Notes

• 4 MB flash
• 28 GPIO pins broken out; 10-electrode capacitive touch support
• Integrated LiPo battery charger confirmed on product page; battery connector presence not separately confirmed, so battery_connector is omitted
• ESP32-D0WDQ6-V3 chip (per SparkFun's own board docs); this chip variant has no PSRAM per Espressif's ESP32 series ordering table
• io.gpio_exposed=28 QUOTED: vendor product page Features & Specs state "28 GPIO"
• io.power_out QUOTED: vendor hookup guide states "The 3.3V regulator on the ESP32 Thing can reliably supply up to 600mA"
• io.gpio_free=17 DERIVED: the vendor's own graphical datasheet enumerates all 28 header pads by GPIO number (36,37,38,39,32,33,34,35,25,26,27,14,12,13 on the left header; 21,1,3,22,19,23,18,5,15,2,0,4,17,16 on the right), matching the vendor's own "28 GPIO" count exactly. This is the bare ESP32-D0WDQ6-V3 chip (not a WROOM/WROVER module), so GPIO37/38 are physically routed and the datasheet's own legend marks GPIO36/37/38/39 all with "*GPIO: Port Input Only" -- two more input-only pins than esp32's soc.reserved_pins (34/35/36/39), which is scoped to the common WROOM module that does not break out 37/38. Of esp32's soc.reserved_pins, strapping 0/2/5/12/15 are all exposed (5 pins); input_only 34/35/36/39 are exposed (4 pins); usb_flash_tied 6/7/8 are not on the header. 28 total pads - 5 strapping - 4 input-only - 2 vendor-confirmed extra input-only (37, 38) = 17