Adafruit Feather M0 Express ATSAMD21 Cortex M0 POL_Electronics Prototyping This loop magnifier set itself

This loop magnifier set itself apart in our eyes because of the little LED on the side

or reverse engineering

We only recommend using Lithium Ion rechargeable batteries with a control circuit (protection PCB) to ensure safe charge

5mm TRS connector is included as an alternative to easily insert an audio cable

Adafruit Feather M0 Express ATSAMD21 Cortex M0 POL_Electronics Prototyping This loop magnifier set itselfAt the Feather M0's heart is an ATSAMD21G18 ARM Cortex M0+ processor, clocked at 48 MHz and at 3. 3V logic, the same one used in the new Arduino Zero . This chip has a whopping 256K of FLASH (8x more than the Atmega328 or 32u4) and 32K of RAM (16x as much)! This chip comes with built in USB so it has USB to Serial program & debug capability built in with no need for an FTDI like chip. Please note that while this board was our first for CircuitPython