Programming ATtiny85 with ArduinoISP

 

 

Download the Tiny-core here: code.google.com/p/arduino-tiny/ 

Follow the instructions in the readme.txt file

Connect your Arduino to the Attiny according to the picture above

• Upload the ArduinoISP to the Arduino dont't connect the capacitor yet.
  
• Connect a 10 µF capacitor from reset to ground on the arduino (negative side to ground)
  
• Open the blink sketch and change pin13 to pin3
  
• select Tools -> board -> Attiny85@1MHZ (leave the serial port as it is)
  
• Select Tools -> Programmer -> Arduino as ISP
  
• Select File -> upload using programmer
  
• Connect a LED with resitor to pin PB3
  
• Now you should have a blinkining Led on your Attiny85
  
  
  Note the factory default is 1MHz, if you want to run 8MHz, use this:
  
  Select Board -> Attiny85@8MHZ
  select Programmer -> Arduino as ISP
Select ->Burn bootloader

Note: this step do not burn a bootloader to your chip, it is only used to set the fuses to another clock-speed.

 

 

PWM pins are PB0, PB1 and PB4
Example: analogWrite(4,127); Pwm on pin PB4, 50% duty cycle

Analog (ADC) pins are PB2 (A1), PB4 (A2) and PB3 (A3) (physical 7,3 and 2)
Example: val=analogRead(2); Reads ADC value on pin PB4

 

Useful links for Atiny85:
Coding Badly's TinyISP reply #33
Coding Badly's TinyTuner
Coding Badly's TinyTuner2
Servo library for attiny85