Flash ATtiny85

Connect the hardware

Prepare Arduino IDE

File -> Preferences

• Additional Board Manager URLs:
  https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json

Tools -> Board -> Board Manager

• Install: attiny

Tools -> Board

• Board: "ATtiny Microcontrollers" -> ATtiny25/45/85
• Processor: ATtiny85
• Clock: Internal 16 MHz
• Port: Your Arduino ISP Port
• Programmer: Arduino as ISP
• Burn Bootloader!!! (To apply clock and other flags)

Test your setup with a simple blink program

void setup() {
  pinMode(4, OUTPUT);
}

void loop() {
  digitalWrite(4, HIGH);
  delay(500);
  digitalWrite(4, LOW);
  delay(500);
}