7. Interrupts || PIR Motion Sensor || Micro-Python Series. Learn with TheIoTGuy

Interrupts
Interrupts is a feature of micro-controller/micro-processor and very useful for making things happen
automatically in microcontroller programs.
Easy definition - you don't need to constantly check the current pin value.
When a change is detected, an event(a method/function is called) is triggered. When an interrupt happens, the CPU stops current jobs and executes the interrupt task, and back to the main job after finishing the task.

Example of Interrupt in MicroPython and ESP32
We'll build a simple project with a PIR motion sensor and a LED. So the task will be:

When the motion is detected, the led will on for the 20s
After the 20s if there's no motion detected the led will turn off.
If motion is detected again, we will light up the led again.
This will continues until you tell the program to stop.
Component Use:
1. ESP32
2. HC-SR501 Motion Sensor
3. 220 Ohm resistor
4. a LED
5. Connecting Wire
6. Thonny IDE (I am using Ubuntu 20.04)
7. Breadboard

Pin Diagram-
1. Connect HC-SR501 VCC pin to 3.3V pin of ESP32
2. Connect HC-SR501 GND pin to GND pin of ESP32.
3. Connect HC-SR501 Data pin to D14 pin of ESP32.
4. Connect LED pin(big leg/Anode) to D12 pin of ESP32
5. Connect the LED ground(small leg/Cathode) to GND of ESP32

[Code & Schematic Diagram]
Github link: https://github.com/ittipu/micro_python_with_esp32/tree/main/7.%20Interrupt_PIR_Motion_Sensor