#!/bin/bash -f
I2C_ADDR="0x5d"

# start ONE_SHOT convertion
i2cset -y 2 ${I2C_ADDR} 0x21 0x01 b
sleep 0.5

# get value
PHI=` i2cget -y 2 ${I2C_ADDR} 0x2a b`
PMID=`i2cget -y 2 ${I2C_ADDR} 0x29 b`
PLO=` i2cget -y 2 ${I2C_ADDR} 0x28 b`
THI=` i2cget -y 2 ${I2C_ADDR} 0x2c b`
TLO=` i2cget -y 2 ${I2C_ADDR} 0x2b b`

# value forming
PHI=` echo ${PHI}  | sed -e 's/0x//g' | tr "[:lower:]" "[:upper:]"`
PMID=`echo ${PMID} | sed -e 's/0x//g' | tr "[:lower:]" "[:upper:]"`
PLO=` echo ${PLO}  | sed -e 's/0x//g' | tr "[:lower:]" "[:upper:]"`
THI=` echo ${THI}  | sed -e 's/0x//g' | tr "[:lower:]" "[:upper:]"`
TLO=` echo ${TLO}  | sed -e 's/0x//g' | tr "[:lower:]" "[:upper:]"`
PHEX_VALUE="${PHI}${PMID}${PLO}"
THEX_VALUE="${THI}${TLO}"


# calc
echo "scale=2; ibase=16; ${PHEX_VALUE} / 1000" | bc

if [ `echo "ibase=16; 8000 <= ${THEX_VALUE}"|bc` = 1 ];
then
    TDEC_VALUE=`echo "ibase=16; ${THEX_VALUE} - 10000" | bc`
else
    TDEC_VALUE=`echo "ibase=16; ${THEX_VALUE}" | bc`
fi
printf "%3.2f\n" `echo "scale=2; 42.5 + (${TDEC_VALUE} / 480)" | bc`


# reset sensor ( for next conv. )
i2cset -y 2 ${I2C_ADDR} 0x21 0x80 b