Raspberry PI DS18B20 connect to GPIO

 

How to connect DS18B20 to RaspberryPI GPIO

 

 

 

 

 

How to view what is the ID of the Device?

 

 
In terminal

 

pi@raspberrypi /sys/bus/w1/devices $ cd /sys/bus/w1/devices/
pi@raspberrypi /sys/bus/w1/devices $ ls
28-000004d13e6d  w1_bus_master1
 
 
28-000004d13e6d This is a my ID 

 

 

How to test DS18B20

 

cat /sys/bus/w1/devices/28-000004d13e6d/w1_slave

 

 

t=26500 = 26.5 C

 

PHP Script 

 

<?php
//File to read
$file = '/sys/bus/w1/devices/28-000004d13e6d/w1_slave';
 
//Read the file line by line
$lines = file($file);
 
//Get the temp from second line 
$temp = explode('=', $lines[1]);
 
//Setup some nice formatting (i.e. 21,3)
$temp = number_format($temp[1] / 1000, 1, ',', '');
 
//And echo that temp
echo $temp . "C";
?>
 
 
 
 

 

Download PHP Script - DOWNLOAD

 

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