![]() ![]() When an external interrupt occurs, the processor first executes these code that is present in ISR and returns back to state where it left the normal execution. Interrupt Service Routine or an Interrupt handler is an event that has small set of instructions in it. In order to use interrupts in Arduino the following concepts are need to be understood. They can also be triggered using RISING or FALLING edges. In ATmega168/328 based Arduino boards any pins or all the 20 signal pins can be used as interrupt pins. These interrupts can be set to trigger on the event of RISING or FALLING or LOW levels.Īrduinos can have more interrupt pins enabled by using pin change interrupts. ![]() These interrupt are interpreted by hardware and are very fast. Now we will see how to use interrupts in Arduino Board. You can also check out Arduino Timer Tutorial that we discussed previously. For example Timer interrupts are software interrupt. ![]() Software Interrupt: It happens according to the instruction from the software. Hardware Interrupt: It happens when an external event occurs like an external interrupt pin changes its state from LOW to HIGH or HIGH to LOW. After executing the ISR processor can again resume the normal execution. ![]() For example, a processor doing a normal execution can be interrupted by some sensor to execute a particular process that is present in ISR (Interrupt Service Routine). So technically, Interrupts is a mechanism by which an I/O or instruction can suspend the normal execution of the processor and gets itself serviced like it has higher priority. The regular process is resumed after serving the Interrupt. Almost every electronic device has some kind to interrupts to ‘interrupt’ the regular process and do some higher priority things on a particular event. So what makes a sudden opening of an airbag in seconds? The answer is interrupts, an interrupt signal is used here which has the highest priority of all.Īnother simple example of Interrupts is touch screen mobile phones which have the highest priority to the “Touch” sense. Microcontrollers present in the car monitor many things simultaneously like sensing the speed of the car, checking other sensors, controlling air conditioner temperature etc. Then based on that interrupt the microcontroller produces an electric signal to deploy the airbags immediately. Consider a fast-moving car, if it suddenly gets hit by another car in opposite direction, the first thing that happens is that, the accelerometer sensor present in the car senses a sudden de-acceleration and triggers an external interrupt to the microcontroller present in the car. ![]()
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