ATmega328 microcontroller with Optiboot (UNO) Bootloader
A fully assembled and tested microcontroller and physical computing board with through-hole headers attached
32KB of flash and 2KB of RAM, running at 16 MHz
Compatible with "Classic" and "R3" Shields
This is the Adafruit METRO Arduino-Compatible - with headers. The METRO works great with the Arduino IDE, and runs the ATmega328P at 16MHz so it is shape and pin-compatible with Arduino UNO R3 shields and boards. You can use this with the Arduino IDE (both desktop and cloud version) by selecting 'Arduino UNO' in the Boards menu. The processor has plenty of GPIO, Analog inputs, hardware UART SPI and I2C, timers and PWM galore - just enough for most simple projects. METRO is the culmination of years of playing with AVRs: it's a development board that is easy to use and is hacker friendly.
Power the METRO with 7-9V polarity protected DC or the micro USB connector to any 5V USB source. The 2.1mm DC jack has an on/off switch next to it so you can turn off your setup easily. The METRO will automagically switch between USB and DC.
Item Specifics Optiboot bootloader pre-installed USB Programming and debugging via well-supported genuine CP2104 Input voltage: 7-9V (a 9VDC power supply is recommended) 5V regulator can supply peak ~800mA as long as the die temp of the regulator does not exceed 150*C 3.3V regulator can supply peak ~150mA as long as the die temp of the regulator does not exceed 150*C 5V logic with 3.3V compatible inputs, can be converted to 3.3V logic operation 20 GPIO: 6 - PWM outputs & 6 - Analog Inputs 6-pin ICSP Header 32KB Flash Memory - 0.5K for bootloader, 31.5KB available after bootloading Adafruit Black PCB with gold plate on pads Size: 53mm x 71mm / 2.1" x 2.8" Height (w/ barrel jack): 13mm / 0.5" Weight: 19g Arduino IDE compatible