LOW: to trigger the interrupt whenever the pin is LOW.The second argument of the attachInterrupt() function is the name of the function that will be called every time the interrupt is triggered. In this example we’ll use GPIO 27 as an interrupt connected to the PIR Motion sensor. With an ESP32 board, all the pins highlighted with a red rectangle in the following figure can be configured as interrupt pins. For example, if you want to use GPIO 27 as an interrupt, use: digitalPinToInterrupt(27) Normally, you should use digitalPinToInterrupt(GPIO) to set the actual GPIO as an interrupt pin. To set an interrupt in the Arduino IDE, you use the attachInterrupt() function, that accepts as arguments: the GPIO pin, the name of the function to be executed, and mode: attachInterrupt(digitalPinToInterrupt(GPIO), function, mode) With interrupts, when a change is detected, an event is triggered (a function is called). With interrupts you don’t need to constantly check the current value of a pin. Interrupts are useful for making things happen automatically in microcontroller programs, and can help solve timing problems. To trigger an event with a PIR motion sensor, you use interrupts. You can use the preceding links or go directly to /tools to find all the parts for your projects at the best price!
Mini PIR motion sensor (AM312) or PIR motion sensor (HC-SR501).ESP32 DOIT DEVKIT V1 Board – read ESP32 Development Boards Review and Comparison.
To follow this tutorial you need the following parts This tutorial is available in video format (watch below) and in written format (continue reading). Watch the Video Tutorial and Project Demo
With this example we’ll also explore two important concepts: interrupts and timers.īefore proceeding with this tutorial you should have the ESP32 add-on installed in your Arduino IDE. When the timer finishes counting down, the LED is automatically turned off. In this example, when motion is detected (an interrupt is triggered), the ESP32 starts a timer and turns an LED on for a predefined number of seconds. This tutorial shows how to detect motion with the ESP32 using a PIR motion sensor.
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