Skip to main content

PIR ON RASPBERRY PI

PASSIVE INFRARED MOTION SENSOR (PIR)

Humans and other animals emit radiation all the time. This is nothing to be concerned about, though, as the type of radiation we emit is infrared radiation (IR), which is pretty harmless at the levels emitted by humans. In fact, all objects above absolute zero (-273.15C) emit IR radiation.
A PIR sensor detects changes in the amount of IR radiation it receives. When there is a significant change in the amount of IR radiation it detects, then a pulse is triggered. This means that a PIR sensor can detect when a human (or any animal) moves in front of it.
pir

WIRING A PIR SENSOR

The pulse emitted when a PIR detects motion needs to be amplified, and so it needs to be powered. There are three pins on the PIR; they should be labelled Vcc, Gnd, and Out. If these labels aren't clear, they are sometimes concealed beneath the Fresnel lens (the white cap), which you can temporarily remove to see the pin labels.
wiring
  1. As shown above, the Vcc pin needs attaching to a 5V pin on the Raspberry Pi.
  2. The Gnd pin on the PIR sensor can be attached to any ground pin on the Raspberry Pi.
  3. Lastly, the Out pin needs to be connected to any of the GPIO pins.

DETECTING MOTION

You can detect motion with the PIR using the code below:
from gpiozero import MotionSensor

pir = MotionSensor(4)

while True:
    if pir.motion_detected:
        print("You moved")

Comments

Post a Comment

Popular posts from this blog

PUNCHING MACHINE

ACCIDENT AVOIDING SYSTEM FOR PUNCHING MACHINE SYNOPSIS The aim of our project is to take a system-wide approach to preventing the machine accident. The system includes not just the machine and the operator; but rather, it includes everything from the initial design of the machine to the training of everyone that is responsible for any aspect of it, to the documentation of all changes, to regular safety audits and a finally a corporate culture of safety-first. Design is the part of a machine's life where the greatest impact can be made in relation to avoiding accidents. The designer should ensure that the machine is safe to set up and operate, safe to install, safe to maintain, safe to repair, and safe to decommission. Although safe operation is usually at the forefront of a designer's mind, safe maintenance and repair should also be a high priority. Around 50% of fatal accidents involving industrial equipment are associated with maintenance activities, and design...
Post a Comment
Read more

Inverted Linear Quadtree: Efficient Top K Spatial Keyword Search

Inverted Linear Quadtree: Efficient Top K Spatial Keyword Search ABSTRACT: In this paper, With advances in geo-positioning technologies and geo-location services, there are a rapidly growing amount of spatiotextual objects collected in many applications such as location based services and social networks, in which an object is described by its spatial location and a set of keywords (terms). Consequently, the study of spatial keyword search which explores both location and textual description of the objects has attracted great attention from the commercial organizations and research communities. In the paper, we study two fundamental problems in the spatial keyword queries: top k spatial keyword search (TOPK-SK), and batch top k spatial keyword search (BTOPK-SK). Given a set of spatio-textual objects, a query location and a set of query keywords, the TOPK-SK retrieves the closest k objects each of which contains all keywords in the query. BTOPK-SK is the batch processing of sets...
Post a Comment
Read more

A simple and reliable touch sensitive security system CODING

#include <REGX51.H> #include "lcd.c" #define MAX_DELAY() delay(65000) sbit Vibra_Sense=P3^1; sbit Buz=P1^0; void intro() {  lcd_init();  lcd_str("Touch Sensitive ",0x80);  lcd_str("Security System ",0xc0);  MAX_DELAY();MAX_DELAY();  lcd_clr();  }  void main()  { unsigned int i = 0, j= 0; intro();    while(1)    { lcd_str("Security Syst On",0x80); lcd_str("No Vibra Detectd",0xc0); Buz = 1; if(Vibra_Sense == 1) { while(Vibra_Sense == 1) delay(1000); } else { while(Vibra_Sense == 0) delay(1000); } Buz = 0; lcd_str("Vibraton Detectd",0xc0);delay(65000); while(1);    }  }
Post a Comment
Read more