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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

About LEAP#126 ArduinoAVR
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, 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 (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.