Summary of Arduino Interrupts and Debouncing
This article explains how interrupts enable a microprocessor to handle asynchronous external inputs while running a program, specifically demonstrating the use of hardware-debounced buttons to activate hardware interrupts on an Arduino. It references prior content on button debouncing and excludes timer interrupts, with additional resources provided for deeper understanding. The project leverages Arduino Uno and common electronic components to implement reliable button-press detection with interrupts.
Parts used in the Arduino Interrupts and Debouncing Project:
- Arduino Uno
- USB Cable
- Arduino Software
- Breadboard
- LEDs
- 150 ohm Resistor
- Pushbutton
- Jumper Kit
- IR Distance Sensor
- Inverting Schmitt Trigger
- 10k ohm Resistor
- 10uF Capacitor
Interrupts are an extremely useful, yet often feared element of microprocessors. Interrupts allow you to run a program, while still being able to react to asynchronous input from the outside world.
On many platforms they can be confusing to implement, but the arduino makes it easy! In this week’s episode, I’ll show you how to use a hardware-debounced button to activate a hardware interrupt on the arduino.
I’d suggest you go check out episode 2, where I initially introduced button debouncing, if you haven’t already. I won’t be covering timer interrupts in this episode, since I recently wrote an extensive blog post about using them. Enjoy the video!
EDIT: You can find a great run-down of debouncing techniques and problems here: http://www.ganssle.com/debouncing.htm (Thanks Jope)
You can download the files associated with this episode here:
1. Arduino Uno: http://us.element-14.com/arduino/a000046/arduino-uno -board/dp/13T9285
2. USB Cable: http://us.element- 14.com/jsp/search/productdetail.jsp?SKU=73H0884
3. Arduino Software: http://arduino.cc/en/Main/Software
4. Breadboard: http://us.element-14.com/jsp/search/productdetail.jsp?SKU=17C6965
5. LEDs: http://us.element-14.com/jsp/search/productdetail.jsp?SKU=30K0645
6. 150 ohm Resistor: http://us.element-14.com/multicomp/mcf -0 -25w -150r/resistor-carbon -film -150ohm-250mw/dp/38K0339
7. Pushbutton: http://us.element-14.com/c -k/ksl1m411 – lf t/switch -tactile -spst -no- 50ma-thd/dp/88K5321
8. Jumper Kit: http://us.element-14.com/3m/923351-i/pcb-accessories/dp/65F2290
9. IR Distance Sensor: http://us.element- 14.com/sharp/gp20a41sk0f/dp/14N9318
10. Inverting Schmitt Trigger: http://us.element- 14.com/stmicroelectronics/m74hc14b1r/ic – hex-inverter -schmitt-trigger/dp/89K0862
11. 10k ohm Resistor: http://us.element-14.com/multicomp/mccfr0w4j0103a50/resistor -carbon -film -10kohm-250mw/dp/58K5002
12. 10uF Capacitor: http://us.element-14.com/multicomp/mcgpr100v106m6 – 3×11/capacitor-alum- elect -10uf -100v/dp/70K9661
For more detail: Arduino Interrupts and Debouncing
