A complete Arduino microcontroller development system on one chip 

With the SAMD21G, a complete Arduino microcontroller development system with very less additional components can be build:

See the SAMD21G article here.

Complete microcontroller development system with the Arduino SAMD21G
Complete microcontroller development system with the Arduino SAMD21G

Note that we need a SAMD21G with a preprogrammed bootloader, but these are hard to get. I have a special programmer to burn the bootloader into SAMD21G chips:

SAMD21G preloaded with Arduino Zero Bootloader for sale
SAMD21G preloaded with Arduino Zero Bootloader for sale

You can also use the SAMD21G with bootloader to repair a blown up SAMD21 mini breakout board:

SAMD21 Mini Breakout repair
SAMD21 Mini Breakout repair

FOR SALE: ATSAMD21G18A-AU with Arduino Zero Bootloader

There is just one SAMD21 bootloader, it can be used for the Arduino Zero, SAM 15x15 and all other Arduino SAMD21 boards. If you don't want to burn the bootloader yourself, I can deliver an ATSAMD21G18 with bootloader to you. 

To order, contact me personally. You can pay with PayPal. The price is $6.95 and the shipping costs are $3.95 for all countries worldwide. 

NEW: Mini SAMD21 development board 15x15mm (Arduino compatible)

The smallest Arduino compatible SAMD21 board: 15x15 mm, 34 I/O pins
The smallest Arduino compatible SAMD21 board: 15x15 mm, 34 I/O pins

The SAM 15x15 is an Arduino development board of just 15 x 15mm, with the same powerful controller as the Arduino Zero: the SAMD21G18. Despite the small size, it has more I/O pins than the Arduino Zero: 34 instead of 20. See the article and how to buy here.

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