ATtiny85 microcontroller tutorials, Part 3: Building LED blinking application using ATtiny85

In the previous tutorial, we learned we need the following hardware and software tools to build any application using ATtiny85.

So let us build the first LED blinking, “hello world” application for the ATtiny85 microcontroller.

Open Arduino IDE. Open LED blinking example from
file->example->basic->blink
Modify the program as follows:We use PORTB pin 0 (PB0) – that means digital pin 0 (PIN 5) of ATtiny85.
Now from the tools menu
1. select board: ATtiny25/45/85
2. select processor: ATtiny85
3. select clock: internal 1 MHz
To create a HEX file for the program, go to preferences and tick the compilation check box from the file menu. Click OK
Now compile/verify the program. This will create a HEX file at a particular location in your PC local HDD
now make the following connection between USB SPI AVR programmer and ATtiny85 microcontroller using jumper wires
Plug the programmer into the USB port of the PC/laptop
Now open PROGISP software
In PROGISP, open the file menu and select load Flash. Get LED blinking program HEX file
Select chip as ATtiny85 and finally click Auto button to download the program
Now disconnect all other connections keeping only Vcc and Gnd connection to provide 5 V to chip
Connect LED to pin 5 as shown in the figure with a current limiting resistor of 330 Ω