Saturday, May 23, 2015

Arduino Gemma

The Arduino Gemma is a microcontroller board made by Adafruit based on the ATtiny85 (datasheet). It has 3 digital input/output pins (of which 2 can be used as PWM outputs and 1 as analog input), an 8 MHz resonator, a micro USB connection, a JST connector for a 3.7V Li-Ion battery, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a battery to get started.

  • Microcontroller ATtiny85
  • Operating Voltage 3.3V
  • Input Voltage 4V to 16V
  • Digital I/O Pins 3
  • PWM Channels 2
  • Analog Input Channels 1
  • DC Current per I/O Pin 20 mA
  • Absorption 9 mA while running
  • Flash Memory 8 kB (ATtiny85) of which 2.75 kB used by bootloader

SRAM 512 Bytes (ATtiny85)
EEPROM 512 Bytes (ATtiny85)
Clock Speed 8 MHz
Diameter 27.94 mm