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to insulate the front of the Pulse Sensor from oily fingers and sweaty earlobes
requires 2 full H-bridges
there's no PWM's available so you can't have precision backlight control unless you somehow rig up an external PWM generator with a 555 or something
and it is a fun environment for ambitious beginners to learn C programming
Adafruit Feather 32u4 with RFM69HCW Packet Radio - 433MHz LiIon & LiPoly to insulate the front ofFeather is the new development board from Adafruit, and like its namesake it is thin, light, and lets you fly! We designed Feather to be a new standard for portable microcontroller cores. This is the Adafruit Feather 32u4 Radio (RFM69HCW) 433MHz our take on an microcontroller packet radio transceiver with built in USB and battery charging. Its an Adafruit Feather 32u4 with a 433 MHz radio module cooked in! Great for making wireless networks that can