An interrupt is a signal to the computer to stop what it is doing and do something else. These are used extensively by the operating system, but an application can use them as well. If you have a GPIO input that needs to be responded to, you could poll the GPIO pin in a loop waiting for it to change, but this can be unreliable for very brief state changes. It is also wasteful of the CPU. The better way is to assign an interrupt that will be activated when the GPIO pin changes state.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.