Detect Movement with ESP32 WROOM 32D + PIR Motion Sensor HC-SR501
When you go out for working, or go to sleep at night, how do you know there aren't any unwelcome guests break into your room, for example, a birt, or a cat, or E.T.? The goal of this project is to note if a movement is detected, and the exact time of the event. You can add more add-in functions or more sensors on this project.
The total cost for this project is less than $15. A ESP32 is usually $5-8, RIP Motion Sensor is $2, other materials <$1. You can finish this tutorial in about 20 minutes.
- ESP32-DevKitC-32D: https://www.espressif.com/en/products/devkits/esp32-devkitc/overview
- PIR Motion Sensor (HC-SR501): https://components101.com/hc-sr501-pir-sensor
- 330 Ohm resistor
- LED light
- Breadboard
- Several jumper wires
Download Arduino IDE. Click Arduino->Preferences->Additional Boards Manager URLs, input the following url https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json Then click OK.
ARDUINO: https://www.arduino.cc/en/Main/Software
Go to Tools->Board->Boards Manager, search for: ESP32, and install.
After installation, you can see.
Choose the correct board, here my case is DOIT ESP32 DEVKIT V1
Go to port, choose USBtoUART. If you don't see this port, go to the following link to install:
https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
You can copy & paste code from file MotionDetectionESP32.ino
There are some values you can change in the code to meet you specific requirement. For the 4-5 lines, you don't have to use GPIO 26 or 27. Use the ones you actually connected. But it only limited to the number pins, like 34, 35, 32... Pins like GND, 3V3 are already be asigned with special functions.
const int led = 26;
const int motionSensor = 27;
Line 23, be sure to match the port number with the Serial.begin()
void setup() {
Serial.begin(230400);
For Line 39, timeSecond * 100 means the LED will be ON for 1 second. timeSecond * 1000 means 10 seconds.
if(startTimer && (now - lastTrigger > (timeSeconds*100))) {
Press Upload button
When uploading done, you can see the detail compiling progress. When you see "Leaving...Hard resetting via RTS pin...", you can click Serial Monitor button, and your motion detection log is running!
- Thanks to my boss Ouyang Dong sponsored my a ESPRESSIF ESP32-WROOM-32D development kit earlier this year. I used this board and a Motion Sensor created this project.
- Thanks to Dinesh for checking and correcting my GPIO connections.
- I referenced the following pages and materials for programming:
ESP32 Series Modules SPEC: https://www.espressif.com/en/products/modules
PIR Overview: https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor?view=all
Testing a PIR: https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/testing-a-pir
ESP32 with PIR Motion Sensor using Interrupts and Timers: https://randomnerdtutorials.com/esp32-pir-motion-sensor-interrupts-timers/