UM TinyC6
Ultra-small ESP32-C6 board with USB-C and low power - perfect for Thread, BLE, and Wi-Fi mesh network projects.
Pinout
19 pins · 2.54 mm pitch| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 1 | A0T1 | safe | adc · touch | |
| 2 | 2 | A1T2 | safe | adc · touch | |
| 3 | 3 | A2T3 | safe | adc · touch | |
| 4 | 4 | A3T4VBAT_SENSE | strapping | adc · touch | |
| 5 | 5 | A4T5 | strapping | adc · touch | |
| 6 | 6 | SDAA5T6 | strapping | adc · touch · i2c | |
| 7 | 7 | SCLA6T7 | strapping | adc · touch · i2c | |
| 8 | 8 | A7T8 | strapping | adc · touch | |
| 9 | 9 | A8T9 | strapping | adc · touch | |
| 10 | 10 | VBUS_SENSE | safe | - | |
| 11 | 16 | TX | uart | uart | |
| 12 | 17 | RX | uart | uart | |
| 13 | 18 | SS | strapping | spi | |
| 14 | 19 | SCK | strapping | spi | |
| 15 | 20 | MISOSDI | safe | spi | |
| 16 | 21 | MOSISDO | safe | spi | |
| 17 | 22 | RGB_PWR | safe | - | |
| 18 | 23 | RGB_DATA | safe | - | |
| 19 | - | LED_BUILTIN | safe | - |
Start with these
8 pins with no boot or system involvementFreely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| A3 | MTMS | Used during boot; required for JTAG debugging; flash data in internal-flash models. | Strapping |
| A4 | MTDI | Used during boot; required for JTAG debugging; flash data in internal-flash models. | Strapping |
| SDA | MTCK | Required for JTAG debugging; connected to flash clock in internal-flash models. | JTAG |
| SCL | MTDO | Required for JTAG debugging; connected to flash data in internal-flash models. | JTAG |
| A7 | GPIO8 | Determines boot mode; pulling low at reset can prevent normal boot. | Strapping |
| A8 | GPIO9 | Pulling low on reset forces the ESP32-C6 into download mode instead of normal boot. | Strapping |
| TX | U0TXD | Default UART0 transmit pin; using it may interfere with serial console or programming. | UART |
| RX | U0RXD | Default UART0 receive pin; using it may interfere with serial console or programming. | UART |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| SS | FSPIQ | Connected to internal flash; using as GPIO can disrupt flash operations. | Flash |
| SCK | FSPID | Connected to internal flash; using as GPIO can disrupt flash operations. | Flash |
Pinout notes The UM TinyC6 breaks out 19 pins in total: 18 GPIO for your project. For peripherals, I²C is mapped to SDA on GPIO6 and SCL on GPIO7; the SPI bus ( MOSI , MISO…
The UM TinyC6 breaks out 19 pins in total: 18 GPIO for your project.
For peripherals, I²C is mapped to SDA on GPIO6 and SCL on GPIO7; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO16 and GPIO17 cover serial logging and flashing.
On the analog side there are 9 ADC-capable pins for sensors and battery monitoring and 9 capacitive-touch inputs.
If you want zero surprises, A0, A1, A2, VBUS_SENSE and 4 more are free of any such role - the safest first picks. 8 of the exposed pins carry boot-time or system duties on the ESP32-C6 (A3, A4, SDA and 5 more).
Getting started
flash your first firmware in ~2 minutesBoard: Tinyc6
USB CDC On Boot: Enabled
Flash Size: 8MB · QIO
Upload Speed: 921600
// blink
pinMode(1, OUTPUT);
digitalWrite(1, LOW); // on (often inverted)[env:um_tinyc6]
platform = espressif32
board = esp32-c6-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-c6-devkitc-1
variant: um_tinyc6
framework:
type: esp-idf
# blink - GPIO1
output:
- platform: gpio
pin: 1
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32c6 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binSpecifications
ESP32-C6 · 35 × 17.8 mmAbout this board
At its core is the ESP32-C6 - a RISC-V part adding Wi-Fi 6 plus Thread/Zigbee radios.
Expect to pay about $17.00 - above the ~$10 typical for ESP32-C6 boards.
Onboard you'll find an addressable RGB LED (GPIO23), battery charging (TP4065) via JST-PH 2.0, status LEDs (Power, Charge) and Reset/Boot buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-C6 boards.
- USB-C with reverse back-feed protection
- LiPo charging ~300mA via TP4065 (JST-PH pads on back)
- 3D high-gain antenna; u.FL external-antenna variant also available
- VBAT voltage sense on GPIO4, 5V (VBUS) presence detect on GPIO10
- Castellated edge + through-hole headers
Where to buy
prices are typical street pricesResources
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