#attiny24

Arduino to ATtiny24 microcontroller transfer in 5 minutes // Have more sketches than you have Arduino's? Use a microcontroller to hold the sketches you want to keep around. With more digital & analog pins the 14-pin ATtiny24 is the next size up from the popular 8-pin ATtiny25/45/85. At just $1.14 from Mouser, it's the way to go. Here's how to program the 24. Get your sketch ready. Downloads & References: 1) First add the new ATtiny24 hardware to your Arduino ‘Boards list’. Download: https://github.com/damellis/attiny/archive/master.zip These extracted file needs to be placed inside the ‘hardware’ directory that lives inside your ‘Sketchbook Location’. If the ‘hardware’ directory does not exist… create it. To find your ‘Sketchbook location’ open your Arduino IDE preferences. It should list where it is there.

Inside the boards.txt file (found within the downloaded file above) delete all the controllers you will not be needing and add only the ‘ATtiny24 (internal 1 MHz clock)’. To add it paste the code below (In my case… when all the processors were listed in the boards.txt file it confused the Arduino IDE and it would upload to the microcontroller with errors): attiny24.name=ATtiny24 (internal 1 MHz clock) attiny24.bootloader.low_fuses=0x62 attiny24.bootloader.high_fuses=0xdf attiny24.bootloader.extended_fuses=0xff attiny24.upload.maximum_size=2048 attiny24.build.mcu=attiny24 attiny24.build.f_cpu=1000000L attiny24.build.core=arduino:arduino attiny24.build.variant=tiny14 (Save the board.txt file. Restart your Arduino IDE if you had it open while doing this) 2) Make your Arduino UNO an in-system programmer (ISP) with a sketch. Under the Arduino IDE… Open FILE>EXAMPLES>ArduinoISP Click Upload to send that sketch into your Arduino and make it an ISP.

3) Under TOOLS>BOARD> Select the ‘ATtiny24 (internal 1 MHz clock)’

4) Under TOOLS>PROGRAMMER> Select ‘Arduino as ISP’

5) Wire your ATtiny24 to your Arduino UNO

ATTiny24 Physical Pin to Arduino Pin VCC / 1    => Arduino 5v GND / 14  =>Arduino GND RESET / 4 => Arduino pin 10 MOSI / 7   => Arduino pin 11 MISO / 8   => Arduino pin 12 SCK / 9     => Arduino pin 13 Place a 10uF capacitor between the RESET and GND pins on your Arduino. I used a 47uF… worked fine. Some people report not using one at all. 6) Connect your computer to your Arduino via USB cable and click 'Upload'. Disregard the message you may see: avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny24 avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny24 7) You’re done! Make sure the pins you defined on your Arduino sketch can be used on the ATtiny24, this link is to a pin reference sheet: Pin reference image: http://www.akafugu.jp/images/microcontroller-reference-sheet.png

More info on the ATtiny24: http://www.atmel.com/Images/doc8006.pdf

Shout-out to http://philipbowles.com/blog for all his help.

Lastly, if you fry your chip... that is on you. Attempt this at your own risk.

Addition 010214 Found this chart that might help a bit.

DUO Tiny: An ATTiny Based Pocket Computer (by Esperantanaso)