Stamp-C3

Board
by M5Stackm5stamp-c3≈ cheap (under ~$15)

Also known as: m5stack_stamp_c3

Verify my boardCompareEdit on GitHub
Flash this board — 1 firmware option
Stamp-C3 board
Board
Stamp-C3 pinout
Pinout

Specifications

Radiosinherited from ESP32-C3

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 5
Bluetooth Classic
no
802.15.4
no

USB

Native USB
yes
Connector
usb-c

Board

Form factor
m5-stamp
Dimensions
34 × 20 × 4.6 mm

Display & extras

Extras
rgb-led
Built onStamp-C3 BoardESP32-C3 SoC

34x20mm ESP32-C3 stamp module: USB-C, programmable RGB LED, 13 exposed GPIO.

Firmware for this board

other

  • Meshtasticdeclaredmesh
    Flash Meshtasticguided

    declared esp-atlas asserts this board↔firmware link at the shown trust tier — it does not guarantee your specific unit or the current firmware version. Flashing can erase keys/config and can brick the device. At your own risk.

Notes

  • ESP32-C3; 4 MB flash
  • SK6812 programmable RGB LED, 13 GPIO exposed, no onboard battery
  • ESP32-C3 has no PSRAM interface at all (chip datasheet lists no PSRAM/external-RAM support)
  • io.gpio_exposed=13 QUOTED: vendor page states "IO Interfaces x13", pins G21, G20, G9, G18, G19, G1, G0, G10, G8, G7, G6, G5, G4
  • io.gpio_free=9 DERIVED, not quoted (SPEC-io-power.md §5.3). Exposed pads {G0,G1,G4,G5,G6,G7,G8,G9,G10,G18,G19,G20,G21} (13, quoted from vendor IO Interfaces list). Subtracting esp32-c3's soc.reserved_pins that are exposed -- strapping {2,8,9}: {8,9} exposed (2), usb_flash_tied {18,19}: {18,19} exposed (2) -- gives 13 - 2 - 2 = 9.

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Stamp-C3 — over Web Serial, no backend, nothing leaves your browser.

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Serial monitor

Not connected.