An Arduino shield for programming ATtiny 45 and 85 microcontrollers.
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EAGLE Update to EAGLE 6.1.0 Jan 27, 2012
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ATtiny 45 and 85 Programmer Shield - For Arduino

Copyright 2011 Design Tech Industries (DTI)

DTI email:

The ATtiny 45 and 85 Programmer Shield is the product of a bored Saturday afternoon and using what I learnt from reading High-Low Tech's tutorial on programming an ATtiny 45 & 85 using an Arduino (


  • Pin compatible with Uno Arduino variants
  • ATtiny Pin 0 LED (for Blink sketch test)
  • A 10uF capacitor between RST and GND to stop Arduino auto-resetting.
  • Open Source; OSHW compliant
  • Design files freely available

In this repository you will find the gerber files for BatchPCB (, along with project (.pro), board (.brd) and schematic (.sch) files for this shield in the 'EAGLE and 'KiCad' folders. Inside the 'EAGLE' folder you will find a folder called 'eagleUp' which contains a 3D model of the shield in SKP format (It also has the eagleUp files themselves which includes a PNG that can be used for home etching of the shield).

I release this design WITHOUT ANY WARRANTY. I created this for fun. Please check the design before using as I am not responsible if it fries something on your Arduino board.


EAGLE The design is saved as an EAGLE project. EAGLE PCB design software is available from free for non-commercial use and can be installed on Windows and Mac, with Linux support through WINE. To use this project download it and place the directory containing these files into the "eagle" directory on your computer. Then open EAGLE and navigate to Projects -> eagle -> ATtiny_45_and_85_programmer_shield.

KiCad KiCad EDA Suite is an Open Source alternative to EAGLE. It is available on Windows and Linux and can be installed on Mac. It is available from and works in a similar way to EAGLE. You will find project files for KiCad in the aptly named folder in this repository. To use this project download it and place the directory containing these files into a folder of your choice. Then open KiCad and navigate to File -> Open -> 'FOLDER_OF_YOUR_CHOICE' ->


To get this to work you need to add ATtiny hardware definitions to your Arduino IDE. I use Wiring 1.0 ( on Mac OSX Lion. I downloaded the ATtiny 45 and 85 hardware definitions from the High-Low Tech website ( which I unzipped and placed the resulting folder into my sketchbook's hardware folder (/Documents/Wiring/hardware). You may need to create the 'hardware' folder if it doesn't already exist.

You will also need to open the ArduinoISP (WiringISP) sketch from the examples menu and upload it to the Arduino you will be using this shield with. After that's done your Arduino is ready for the shield!

As an example try uploading the Blink sketch to test the shield and if it all works:

  • Open the Blink sketch from the examples menu.
  • Change the pin numbers from 13 to 0.
  • Select “ATtiny45 (w/ Arduino as ISP)” or “ATtiny85 (w/ Arduino as ISP)” from the Tools > Board menu (leave the serial port set to that of your Arduino board).
  • Upload the sketch.

You can also program ATtiny 44 & 84 chips by using jumpers between the DIP socket and the correct pins on the chip. I will include a 14 pin DIP socket in the next revision. You will need to get the 44 and 84 hardware definitions from here: and follow instructions found here:

The shield has a built in LED connected to the ATtiny45/85's pin 0 for convenience.


You can also find this design on BatchPCB ready to add to your cart:


The specific terms of distribution of this project are governed by the license referenced below.


This work is licensed under the Creative Commons Attribution-ShareAlike License.

To view a copy of this license, visit:

or send a letter to

Creative Commons
171 Second Street, Suite 300
San Francisco
California, 94105

The "license" folder within this repository also contains copies of the license(s) referenced above.