Software:
Arduino IDE
Hardware:
Arduino Mega 2560 Rev3
Vin 7-12V => 5V, 16MHz, 256kB Flash, 54 digital I/O / 16 analog / 20mA, 4 serial, ...
SparkFun OpenLog (ATmega328p)
Vin (3.3V)3.8V-5V(12V), 16MHz, 32kB Flash, SPI pogo pins, 1 serial, micro sd card reader, very small
DFRobot Beetle (ATmega32u4)
Vin 4.5V-5.5V, 16Mhz, 32kB Flash, SPI pogo pins, 3(7) digital I/O / 3 analog, 1 serial, 1 I2C
Adafruit Pro Trinket - 3V 12MHz (ATmega328p)
Vin 3.5V-(12V), 12MHz, 32kB Flash, 10(12) digital I/O (SPI/INT1) / 5 analog / 1 serial
Take care if you need 3.3V for other components.
You might want to use 12MHz@3.3V, because 16MHz@3.3V is not recommened for a ATmega328p...
Use all of these information at your own risk :)
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