Fork me on GitHub

Project Notes

#126 ATtiny Hardware Interrupt

Test hardware interrupts with an ATtiny85 processor on a breadboard.

Here’s a quick video of the circuit in action:



This is a little test of hardware interrupts with an ATtiny85 microcontroller (8-pin DIP).

I’m using an Arduino Uno as an in-system programmer, using the technique described in the ProgrammingWithArduinoISP project.

A push-button is attached to D2 (pin 7 of the chip) and a hardware interrupt service routine activates on rising edge. When an interrupt is received, it triggers a little LED blinking procedure just for demonstration purposes.

Once the ATtiny is programmed, the Arduino Uno ISP is detached, and it will run independently.

The ATtiny85 requires 1.8-5.5V to operate. I successfully tested with 3.3V and 5V supplies.



The Schematic

The Build

Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.