Motion Detection Notifications

Motion Detection Project with GrovePi  and Hologram Nova

This project uses the Grove Motion Sensor that can be used to detect movement of people, animals or other objects. It also can send notifications using cellular network.

Things used in this project:

Hardware components:

• Raspberry Pi Zero W or WH
• GrovePi Zero 
• Grove PIR Motion Sensor
• Grove LCD RGB Backlight
• Hologram SIM

Software Apps:

• GrovePi 
• Python
• Hologram CLI

Grove - Adjustable PIR Motion Sensor - It uses passive infrared  motion sensor, which can detect infrared object motion up to 3 meters. It is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. 

Animals, people or various objects emit heat energy in the form of radiation. This radiation is not visibile to human eye as it radiates at infrared wavelengths, but it can be detected PIR-based motion detector. These are commonly used in burglar alarms.

GrovePi Zero is a HAT from Dexter Industries  that allows Grove PIR motion sensor to connect to Raspberry Pi zero with out needing soldering or breadboards. One can plug in the Grove water sensor start programming.

Grove water sensor works with digital I/O pins and it can be connected to D3 port Grove Pi Zero as shown below.
The installation instructions for Grove Pi zero and Hologram SIM are provided here .

The following program (motion_sensor_led.py) checks the water sensor output sets the text on LCD.
After execution of the above program, the status is displayed on the LCD.

 $ sudo python motion_sensor_led.py

First  a cellular connection is established using the credentials that uses a devicekey obtained from Hologram dashboard.

After reading the digital input from port D3 it determines if motion is detected and displays the message on the LCD and it also sends notification using cellular network if there is a movement.

import time
import grovepi
from grove_rgb_lcd import *
from Hologram.HologramCloud import HologramCloud


# Establish a cellular connection
credentials = {'devicekey': 'xxxx'}
hologram = HologramCloud(credentials, network='cellular')

# Connect to port D3, which as digital pins 1 and 2

setRGB(0,255,0)
pir_sensor = 3
motion=0
grovepi.pinMode(pir_sensor,"INPUT")

while True:
        try:
                # Sense motion, usually human, within the target range
                motion=grovepi.digitalRead(pir_sensor)
                if motion==0 or motion==1:      # check if reads were 0 or 1 it can be 255 also because of IO Errors so remove those values
                        if motion==1:
                                response_code = hologram.sendMessage("Motion Detected")
                                setText_norefresh("Motion Detected")
                        else:
                                setText_norefresh("")
                  
                time.sleep(10)

        except IOError:
                print ("Error")

Configure routes in Hologram dash board to send the notifications (e.g., SMS, email etc).