#!/bin/bash

response=`i2cget -y 1 0x18 0x05 w`
upper_byte=$(($response & 0x00FF))
lower_byte=$(($response & 0xFF00))
let "sign=0"
# test the sign
if [ $(($upper_byte & 0x10)) = 0x10 ]
then
	upper_byte=$(($upper_byte & 0x0F))	
	let "temperature = 256 - (upper_byte * 16 + lower_byte / 4096)"
else
	upper_byte=$((upper_byte & 0x0F))
	let "temperature = ($upper_byte*100 * 16 + $lower_byte*100 / 4096)"
fi
# printf %.2f "$(($temperature))e-2"
echo $temperature > toto;