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Program ATtiny85 with Arduino UNO

Step 1: Parts List
  • Arduino UNO
  • Arduino Attiny85
  • 10 uF capacitor
  • breadboard
Step 2: Wiring
  • ATtiny Reset <–> Arduino Pin 10
  • ATtiny Pin 0 <–> Arduino Pin 11
  • ATtiny Pin 1 <–> Arduino Pin 12
  • ATtiny Pin 2 <–> Arduino Pin 13
  • VCC <–> 5v
  • GND <–> GND
  • ** 10 uF capacitor (+) <–> Arduino Pin Reset
  • ** 10 uF capacitor (-) <–> Arduino Pin GND

Program ATtiny85 with Arduino UNO_Elec-Cafe

Step 3: Step by step
  • Upload ArduinoISP sketch into Arduino
  • Power down
  • Make connections to ATtiny chip
  • Power up (ATtiny will start running)
  • Select proper board via Tools/Board (ATtiny85 internal 1MHz clock)
  • Select proper programmer via Tools/Programmer/Arduino as ISP
  • Upload sketch
Note: Clock frequencies
  • From the factory, ATtiny85 is fused for 1 MHz internal clock.
  • You can change the fusing to use 8 MHz internal clock by running “Burn Bootloader”. You only need to do this once (per chip)
  • You can attach an external crystal to run at up to 20 MHz. Select 20 MHz board and run “Burn Bootloader”. I think you need to hook up the crystal before programming.