Adafruit sure love the ATmega328 here at Adafruit, and Adafruit use them a lot for Adafruit's own projects. The processor has plenty of GPIO, Analog inputs, hardware UART SPI and I2C, timers and PWM galore - just enough for most simple projects. When Adafruit need to go small, Adafruit use a Pro Trinket 3V or 5V, but when size isn't as much of a concern, and an USB-serial converter is required, Adafruit reach for an Adafruit METRO.
This is the Adafruit METRO with headers. It comes with headers soldered on. It's a fully assembled and tested board with SMT headers attached as well as through hole headers. If you don't want a Metro with through-hole headers or at least, holes for them, but not attached for super-slimness, check out Adafruit's Metro without Headers.
METRO is the culmination of years of playing with AVRs: Adafruit wanted to make a development board that is easy to use and is hacker friendly. At the heart is an ATmega328P, with 32KB of flash and 2KB of RAM, running at 16 MHz
They also include 4 rubber bumpers to keep it from slipping off your desk. Metro shown with Adafruit's 12x capacitive touch shield attached just to demonstrate the headers, but that shield is not included!
Detailed specifications:
Revision History:
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