Nerdonic launched Exen Mini last year as the world’s smallest 32-bit Arduino compatible board, and getting the smallest board possible is very good for some projects, but so not much for other as Exen Mini is limited to just 8 I/O pins.
So the company made another larger board called Exen Proto based on the same Microchip SAMD21 Cortex M0+ microcontroller, but offering more I/Os.
- MCU – Microchip SAMD21 Cortex M0+ MCU @ 48 MHz with 256KB flash, 32KB SRAM
- I/Os via 2x 12-pin 2.54mm pitch headers
- Up to 20x digital I/O
- Up to 19x PWM
- Up to 11x analog (ADC) up to 12-bit resolution
- 2x UART
- Up to 5x I2C
- 1x reset
- Limits – 3.3V, 7mA
- USB – 1x micro USB port
- Programming – Via micro USB port or SWD header
- Misc – Power LED, user LED, button
- Power Supply
- 3.3-20V (regulated to 3.3v) via power Pin 1
- 3.3V via power pin 2
- 5V (regulated to 3.3v) via Micro USB port
- Current Draw = ~10mA
- Dimensions – 29.8 x 14.9 x 4.4mm
- Weight – 1.1 grams
Exen Proto board has launched on Indiegogo with a flexible funding goal, and if interested, you can pledge as low as 8 GBP (~$10.40 US) to get a board in September 2018, or get the boards in packs of 5 or 10 for about $52 or $104 US respectively. Shipping adds 2 GBP ($2.6) to the UK, and 4 GBP ($5.2) to the rest of the world.