lookslikematrix / motiondetector

This is a project for motion detection with the raspberry pi and the motion senscor HC-SR501.

MotionDetector

This is a project for motion detection with the raspberry pi and the motion senscor HC-SR501.

Installation

If you want to install the motion detector on your raspberry pi you first have to connect your motion detector as in the image above. The HC-SR501 has a jumper for configuration between two modes. I chose the L mode, which means that when motion is detected the signal stays high (1) until there is no more detection.

After connecting your sensor you can turn on the rasperry pi, connect to it and type the following lines.

git clone https://github.com/deckersoftware/MotionDetector.git
cd MotionDetector
python3 main.py

Now your motion detection should be started with default configuration. If you like to end the the program just press Ctrl + C.

To automatically start the script after a reboot, you have to execute the following lines.

sudo ln -s `pwd`/motion_detector.service /etc/systemd/system/motion_detector.service
sudo systemctl enable motion_detector.service
sudo systemctl start motion_detector.service

Configuration

In the config.json file you can set the motion detection with the following parameters. The file is copied from the config.json.sample file at the first start of the program.

Parameter	Description	Default
motion_input_pin	Defines the pin where the motion detector is connected to the raspberry pi	7
motion_detected_duration_in_seconds	Defines duration before no_motion_action is executed	30
no_motion_detected_duration_in_seconds	Defines duration until motion_action is executed	6
no_motion_action	Defines action when there is no motion detected. For example turn of the display	vcgencmd display_power 0
motion_action	Defines action when there is motion detected. For example turn on the display	vcgencmd display_power 1
motion_detection_time	Defines the time when the motion detection is activated. For example every day from 5 o'clock till 21 o'clock.	{"monday": "5:00 21:00", "tuesday": "5:00 21:00", "wednesday": "5:00 21:00", "thursday": "5:00 21:00", "friday": "5:00 21:00", "saturday": "5:00 21:00", "sunday": "5:00 21:00" }

HC-SR501

The motion detection sensor has two potentiometers. One of them is for the time adjust delay which is configurable between 5 and 300 seconds, the other one is for the sensitivity. I set the first one to 5 seconds which explains the 6 seconds no_motion_detected_duration_in_seconds configuration. When there is still motion after 6 seconds I would like to execute the motion action. Otherwise, nothing should happen.