Setting Up ATtiny85 for Beginners

Setting up the ATtiny85 microcontroller for programming can be a rewarding journey for beginners. This guide will walk you through the essential steps, from choosing the right hardware to writing and uploading your first program.


1. Selecting the Necessary Hardware:

To start with ATtiny85, you will need:

  • ATtiny85 Microcontroller: Obtain the ATtiny85 chip either standalone or on a development board.
  • Programmer: A hardware programmer such as USBasp, Arduino as ISP, or dedicated AVR programmers is needed for uploading code.
  • Breadboard and Jumpers: For prototyping and connecting components.


2. Installing Arduino IDE:

To program the ATtiny85 using the Arduino environment, you'll need to similar with the pinout, install the Arduino IDE and add support for ATtiny boards.


1. Download and Install Arduino IDE:

  • Visit Arduino's official website and download the latest version of the Arduino IDE.
  • Follow the installation instructions for your operating system.

2. Adding ATtiny Support:

  • Open the Arduino IDE and navigate to "File" -> "Preferences."
  • In the "Additional Boards Manager URLs" field, add the following URL: http://drazzy.com/package_drazzy.com_index.json
  • Click "OK" to close the Preferences window.
  • Navigate to "Tools" -> "Board" -> "Boards Manager."
  • Search for "attiny" and install the "ATTinyCore" by Spence Konde.
  • Close the Boards Manager.
3. Selecting ATtiny85 Board:
  • Now, you can select the ATtiny85 board from "Tools" -> "Board" -> "ATtiny25/45/85."

3. Wiring the ATtiny85:

Connect your ATtiny85 to the programmer following these basic connections:

  • VCC to +VCC
  • GND to GND
  • Pin 2 (PB3) to RESET (via a 10kΩ resistor to +VCC for programming purposes)
  • Pin 5 (PB0) to MOSI
  • Pin 6 (PB1) to MISO
  • Pin 7 (PB2) to SCK

4. Uploading the Blink Example:


Let's upload a simple blink program to test your setup:

Open Blink Example:

  • In Arduino IDE, go to "File" -> "Examples" -> "01.Basics" -> "Blink."

Configure Settings:

  • In the code, change the LED_BUILTIN to 0 (for Pin 5 on ATtiny85).
#define LED_BUILTIN 0

Select Board and Programmer:

  • Choose "ATtiny25/45/85" as the board under "Tools" -> "Board."
  • Choose your programmer under "Tools" -> "Programmer."

Upload the Code:

  • Connect the programmer to your computer.
  • Click "Upload" (or "Sketch" -> "Upload") in the Arduino IDE.

5. Verify and Explore:


Once uploaded, the onboard LED on Pin 5 (PB0) of the ATtiny85 should blink. Congratulations! You've successfully set up and programmed the ATtiny85. 

Now, you can explore more features, libraries, and projects available for ATtiny85 to unleash its potential in your electronics projects. Happy coding!

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