Shrinked Arduino: flashing an Attiny 85

by filed under Arduino, Tech, Programming.
Programming an Attiny85 I’ve just started to explore the Attiny 85 small Arduino’s brother. To program the chip I’ve successfully followed the guide Programming an ATtiny w/ Arduino 1.0  , just a few quick notes:
  • you can use Arduino IDE 1.0, after uploading Attiny Arduino libs into your sketchbook/hardware folder
  • in the Arduino IDE: load Arduino as ISP sketch from examples and change in the heartbeat function the delay(40) to delay(20), then upload the sketch on your Arduino board
  • prepare the breadboard to flash the Attiny chip
  • if you have an Arduino UNO rev.2 you now MUST put a 10uF capacitor between reset and gnd pins on the Arduino board (not sure about other boards)
  • in the Arduino IDE: set the board to Attiny 85 (or to your chip type, if differs)
  • in the Arduino IDE: set the clock of the Attiny to 8MHz (or whatever you choose), this must be done only the first time you use the chip
  • in the Arduino IDE:open the blink sketch, change the pin from 13 to 0
  • click the upload upload (if you get errors, see below)
Next step: how to use 3 PWM pins? It seems like it only has two.
If you get this error:
avrdude: stk500_initialize(): programmer not in sync, resp=0x15
avrdude: stk500_initialize(): programmer not in sync, resp=0x15
avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85
avrdude: stk500_program_enable(): protocol error, expect=0x14, resp=0x12
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.
just retry, usually the second time it goes through.