3.1415

get_temp.sh

@@ -1,6 +1,17 @@
 #!/bin/bash
 
-response = `i2cget -y 1 0x18 0x05 w`
-upper_byte = $(($response & 0x00FF))
-echo $response
-echo $upper_byte
+response=`i2cget -y 1 0x18 0x05 w`
+upper_byte=$(($response & 0x00FF))
+lower_byte=$(($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