SAM 15×15 is a Tiny Arduino Zero Compatible Board based on Atmel SAMD21G18 MCU

Arduino Zero is an official Arduino board based on UNO r3 form factor but using Atmel SAMD21G18 ARM Cortex M0+ MCU instead of an AVR MCU. Albert van Dalen has decided to design a compatible module based on the same MCU, and called SAM 15×15, as its size can be trimmed down to as low as 15×15 mm.

SAM 15×15 comparison with Arduino Zero and Uno boards.

SAM 15×15 Arduino Zero Arduino Uno
Microcontroller ATSAMD21G18A ATSAMD21G18A ATmega328P
Digital I/O Pins digitalWrite digitalRead 34 20 14
Analog Output Pins (PWM) analogWrite 24 10 6
Analog Input Pins (ADC) analogRead 14 6 6
ADC resolution 12-bit 12-bit 10-bit
10-bit DACs 1 1 0
Flash Memory 256KB 256KB 32KB
EEPROM 32KB (emulated in Flash) 32KB (emulated in Flash) 1KB
CPU Speed 48MHz 48MHz 16MHz

The board allows for three form factors to match your specific needs:

  • 28 x 28mm – 40 pins with 2.54mm pitch; fits on a breadboard
  • 22 x 22mm – Smaller version of the 28 x 28mm board with less 2.54mm pitch
  • 15 x 15mm – 40 pins with 1.27mm pitch

While SAM 15×15 modules are much smaller than Arduino Zero, they come with 34 I/Os instead of just 21 I/Os on Zero board.

Pinout Diagram – Click to Enlarge

You can program the board with the Arduino IDE just like you’d do with an Arduino Zero, except you’ll need to solder a USB header as shown in the picture below, and use a special, yet cheap, 5-pin female to USB male cable to program it.

Beside the link to in the introduction, you’ll find more details on the developer’s project page, where you can also contact him if you want to purchase the board for 24.95 Euros including worldwide shipping. Technical questions can be asked on a dedicated thread on forums.

Thanks to Nanik for the tip.

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