Arduino Controlling Multiple P.I.R Sensor on Same Bord

Today I will tell you how to connect multiple PIR Sensors with single Arduino Bord

>here i have also used 4 channel relay module for some extra functionality.

ARDUINO + 4 Channel Relay Module + 4 PIR Sensor (OR You can used as many pin your arduino has )

Step 1: Hardware Required

1. Arduino Uno
2. P.I.R Sensor Hc-SR501
3. Breadboard
4. Jumper Wires
5. 12 V-2 A D.C Power Supply
   
6. 5V Relay Module

Step 2: Hardware Connection

Arduino________________TO_____________________PIR SENSORS(PIR1,PIR2,PIR3,PIR4)

Arduino PIN 3........................................PIR1-output pin

Arduino PIN 4........................................PIR2-output pin

Arduino PIN 5........................................PIR3-output pin

Arduino PIN 6........................................PIR3-output pin

Arduino 5v..............................................PIR1,PIR2,PIR3,PIR4(VCC )//connect all Vcc pin of pir1, pir2 , pir3 , pir4

//to the Arduino 5 v

Arduino GND..........................................PIR1,PIR2,PIR3,PIR4(GND )

ARDUINO________________TO________________________REALY MODULE

Arduino PIN 9.................................................................IN1 RELAY

Arduino PIN 10.................................................................IN2 RELAY

Arduino PIN 11...............................................................IN3 RELAY

Arduino PIN 12................................................................IN4 RELAY

Arduino GND..................................................................Relay GND

Arduino Vin.....................................................................Relay VCC

12 v -2A Power Supply .................................................to...........................................Relay Model 12v Input &GND (Some Relay Module Does not have 12 v power input so you need a 12 v to 5 v converter ......or you can distribute power by yourself .

Step 3: Programming Part

Here Programming is most important part

while in this project I face lots of problem in programming only.

• here i have used a Arduino internal pulled up resistor
• I used (IF-Statement) Without else Statement for stability

If you face any problem do not forget to comment

Comments

[byron.green.904]

I am trying to connect multiple motion sensors to the same relay with or || signs and it is just leaving the light on. I have If (lightVal<50 && motion3||motion4||motion5||motion6== HIGH)
digitalWrite(relay, HIGH);
delay(dv);
for some reason the light just stays on regardless of motion.

I also have an else of digitalWrite (relay, LOW);

[michelkeijzers]

I think you missed one combination, I see 15 and there should be 16 I guess.

In that case, the code can be simplified using arrays:
(the alignment is removed by posts sadly, replace ~ by spaces).

const int NR_OF_MOTION_RELAYS = 4;
const int MOTION_PINS[NR_OF_MOTION_RELAYS] = { 3, 4, 5, 6 };
const int RELAY_PINS[NR_OF_MOTION_RELAYS] = { 9, 10, 11, 12 };

void setup()
{
~~for (int motion_relay = 0; motion_relay < NR_OF_MOTION_RELAYS; motion_relay++)
~~{
~~~~pinMode(MOTION_PINS[motion_relay], INPUT_PULLUP);
~~~~pinMode(RELAY_PINS [motion_relay], OUTPUT);
~~}
}

void loop()
{
~~for (int motion_relay = 0; motion_relay < NR_OF_MOTION_RELAYS; motion_relay++)
~~{
~~~~digitalWrite(RELAY_PINS[motion_relay], digitalRead(MOTION_PINS[motion_relay]));
~~}
}

[Leo99]

Hi, I have a question. I've read your code and I've seen that you did 14 "if cases" in order to control each PIR state. I was wondering if you could replace in the code these 14 structures with 4 if cases written as follow:

if (proximity1==HIGH){
digitalWrite(RELAY1, HIGH);
}
else{
digitalWrite (RELAY1, LOW);
}

[kmutahi]

cant see code

[muhammadhishaam583]

Hey I want to increase their time, and i don't want to add delay as it pause the program, also not from the PIR delay, is there any other option to increase their time?

[dhanasekhar2514]

code please

[hackplague]

Code is in the end.

[jivian111]

How to add buzzer and gsm module for this

[DRNFBN]

Have you already known how? I also need it for my project