NOTE: There is lot of different type of relays. In this video I'm using 12V relay module and it works good. But I have another relay that look similar to this that I'm using in this video and also for 12V and that relay won't work with this circuit. Only difference between that two relay is resistors with different values. If you want to be sure that this circuit will work it's better to use 5V relay module.

In this video I will show how to use motion sensor only with relay module. With this circuit we can control high voltage and high current devices up to 250V and 10A.

The PIR sensor (Passive Infrared Sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically-activated lighting systems.


This module is small size and easy to use. It is just a single bit output (High or Low) and compatible with any types of microcontroller.
Specification

Product Type: HC--SR501 Body Sensor Module
Operating voltage range: DC 4.5-20V
Quiescent Current: up to 50uA
Level output: High 3.3 V /Low 0V
Trigger: L cannot be repeated trigger/H can be repeated trigger(Default repeated trigger)
Delay time: 5-200S(adjustable) the range is (0.xx second to tens of second)
Block time: 2.5S(default)Can be made a range(0.xx to tens of seconds
Board Dimensions: 32mm*24mm
Angle Sensor: les than 100 ° cone angle
Operation Temp: -15-+70 degrees
Lens size sensor: Diameter:23mm(Default)


Applications:

Switch
Motion sensor
Thief-guarding system
Industrial automation

RELAY
Specification:

Maximum load: AC 250V/10A, DC 30V/10A
Trigger current: 5mA
Working voltage: 12V
Module size: 50 x 26 x 18.5mm (L x W x H)
Four mounting bolts holes, diameter 3.1mm

Module interface:

DC+: positive power supply (VCC)
DC-: negative power supply (GND)
IN: can be high or low level control relay

Relay outputs:

NO: normally open relay interface
COM: Common Interface Relays
NC: normally closed relay interface

High and low level trigger options:

It is low level trigger when jumper connect to LOW pin
It is high level trigger when jumper connect to HIGH pin

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