Re-Programming the LilyTiny / LilyTwinkle

Contributors: bri_huang
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Test Code - "Hello World!"

Note: This example assumes you are using the latest version of the Arduino IDE on your desktop. If this is your first time using Arduino, please review our tutorial on installing the Arduino IDE.

As with nearly every introductory Arduino project, we test our system with a "blink" program -- the equivalent to "Hello World!" in most other programming environments. First, we need to make sure the configuration is set properly in the Arduino IDE.

Step 0 - Open up the Arduino IDE

Open the Arduino IDE if you have not already.

Step 1 - Setting the Board Type

The LilyTiny has an ATtiny85 microcontroller on it. Change the board type in the Arduino IDE to correspond with this. The ATtiny85 can be set with either a 1 MHz internal clock or an 8 MHz internal clock. Be sure to select 8 MHz. Select: Tools --> Board --> ATtiny85 (internal 8 MHz clock)

Board Selection

Step 2 - Setting the Programmer

Because we are using the Tiny AVR as our programmer, we need the change the default programmer. This settings is also under the Tools > Programmer > USBtinyISP.

Select Programmer

Step 3 - Upload Code

Copy the code below and paste this into your Arduino window.

int blinkPin = 0;
void setup()
   pinMode(blinkPin, OUTPUT);

void loop()
    digitalWrite(blinkPin, HIGH);
    digitalWrite(blinkPin, LOW);

Click the upload button. You may see a few warning messages such as:

avrdude: please define PAGEL and BS2 signals in the configuration file for part ATtiny85

You can ignore this one. If everything is working, you should be able to see a blinking LED on GPIO 0 (pin 5 of the ATtiny). This can be on the Tiny AVR Programmer, the ProtoSnap LilyTwinkle Kit, or an LED that is attached to the ATtiny 85.