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Software Serial works an an ATiny85!

important configure the ATiny85 to run on 8Mhz

avrdude -b 19200 -c usbtiny -p t85 -U lfuse:w:0xe2:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m 

<syntaxhighlight lang="cpp"> /*

 Turns on an LED on for one second, then off for one second, repeatedly.

 This example code is in the public domain.

// Pin 0 has an LED connected on most Arduino boards. // give it a name: int led = 0;

// the setup routine runs once when you press reset: void setup() {

 // initialize the digital pin as an output.
 pinMode(led, OUTPUT);     


// the loop routine runs over and over again forever: void loop() {

 digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)
 delay(1000);               // wait for a second
 digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
 delay(1000);               // wait for a second

} </syntaxhighlight>