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Motion Detector Example

About

Example of a motion detector using a PIR sensor, LEDs and Node-Red

Hardware:

  • 1 PIR sensor
  • 1 Green LED
  • 1 Red LED
  • 2 220ohm resisters

Configuration

Connect the LEDs and PIR sensor as shown below.

Wiring Diagram

  • Make sure that the PIR sensor is connected to the 5v pin and not the 3.3v pin on the Raspberry Pi

  • The output pin on the PIR should be connected to pin #7 on the Raspberry Pi.

  • The Green LED should be connected to pin #11 on the Pi, and the Red LED connected to pin #12

Running

Start EdgeX

While you can run EdgeX on a RaspberryPi, due to it's limited resources it's best to run the EdgeX services on your PC or another computer.

Use the docker-compose.yaml file provided in this example project to launch an EdgeX stack

docker-compose -f ./examples/MotionDetector/docker-compose.yaml up -d

This file also includes Mosquitto MQTT broker and Node Red, both of which are used later in this example.

Run the device service

Before running device-rpi for this example, you will need to change its configuration.toml to point to the IP address of your RaspberryPi as well as the IP address of your running EdgeX services.

At the top of the file, replace the Host property with the IP address of your RaspberryPi

Service Configuration

In the [Clients] section, update the Host properties for Data and Metadata with the IP address of the machine running the EdgeX services you started in the first step.

Clients Configuration

Then you can start the device-rpi service using using the MotionDetector example:

./build/release/device-rpi --confdir ./examples/MotionDetector

Configure Node-Red

A Node-Red flow is provided for this example, you will need to load it into your instance.

  1. Open http://localhost:1880/ on the the machine running your EdgeX services (or replace localhost with that machine's IP address)

  2. Import the example Node-Red configuration by copy/pasting the provided motion_detector_flow.json file into your instance:

Import from Clipboard Import Flow

  1. Click the Deploy button at the top of your Node-Red screen to start your flow

Export device service readings to Node-Red

Finally, you need to tell your EdgeX instance to export data from device-rpi to Node-Red. This example uses the Mosquitto MQTT broker to link the two.

Run the register_mqtt_export.sh script on the machine running your EdgeX services (or replace localhost at the end of that script with that machine's IP address)

./register_mqtt_export.sh

Testing

You will now have a Node-Red dashboard at http://localhost:1880/ui/ where you can watch motion events come in and also control the Red LED on your board.

Node-Red Dashboard