Temperature from DS18B20 on a Raspberry Pi

ds18b20_read

#!/bin/bash

# read DS18B20 (default is data connect on GPIO4)
# add 'dtoverlay=w1-gpio' to /boot/config.txt to load one-wire device tree and reboot
# test on Rpi with Raspbian Jessie

while [ true ]
do
    cat /sys/bus/w1/devices/28-0000040de8f8/w1_slave | grep 't=' | awk -F 't=' '{printf("%.2f\n", $2/1000)}'
done