Here are some of the updates you can look forward to when using Feather M4:
Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
Light as a (large?) feather - 5 grams
ATSAMD51 32-bit Cortex M4 core running at 120 MHz, 32-bit, 3.3V logic and power
Hardware DSP and floating point support
512 KB flash, 192 KB RAM
2 MB SPI FLASH chip for storing files and CircuitPython code storage.
No EEPROM
32.768 KHz crystal for clock generation & RTC
3.3V regulator with 500mA peak current output
USB native support, comes with USB bootloader and serial port debugging
Built in crypto engines with AES (256 bit), true RNG, Pubkey controller
Tons of GPIO! 21 x GPIO pins with following capabilities:
Dual 1 MSPS 12 bit true analog DAC (A0 and A1) - can be used to play 12-bit stereo audio clips
Dual 1 MSPS 12 bit ADC (6 analog pins some on ADC1 and some on ADC2)
6 x hardware SERCOM - Native hardware SPI, I2C and Serial all available
16 x PWM outputs - for servos, LEDs, etc
I2S input and output
8-bit Parallel capture controller (for camera/video in)
Built in 100mA lipoly charger with charging status indicator LED
Pin #13 red LED for general purpose blinking
Power/enable pin
4 mounting holes
Reset button
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