[onewire] / readtemp.sh

#!/bin/bash

DEV=/dev/ttyUSB0
TIMEOUT=5
LOCK=/var/tmp/readtemp.lock

SYSDEV=/sys/bus/usb/devices
for i in $SYSDEV/*
do
if [ -f "$i/interface" ]
then
	if grep -q "CP2102 USB to UART" "$i/interface"
	then
		DEV=/dev/$(basename `ls -d $i/ttyUSB* `)
		# dont break here, keep going so we get the last one
		# break
	fi
fi
done

if ! lockfile -r 3 -l 5 $LOCK
then
echo "Failed to obtain lock"
exit;
fi

if ! stty --file=$DEV | grep -q 'speed 19200'
then
stty --file=$DEV 19200
sleep 1
fi

if ! stty --file=$DEV | grep -q '-echo'
then
stty --file=$DEV -echo
sleep 1
fi

echo -n "t" >> $DEV

MODE=plain
if [ $# -ge 1 ] && [ "$1" == "-c" ]; then
MODE=cacti
fi

while read -t $TIMEOUT -u 3 CODE ID TEM OTH; do
# last one
	if [ "$CODE" == "END" ]; then 
		break;
	fi

# not a valid line
	if [ "$CODE" != "TEMP" ]; then
		echo "ERROR CODE=$CODE ID=$ID TEM=$TEM"
		continue;
	fi

# truncate for paranoia
	TEM=${TEM:0:4}

# calculate degrees from the hex code
	DEGC=`echo "16 i $TEM A i 4 k 0.0625 * p" | dc`
# display the result
if [ $MODE == "cacti" ]; then
	printf "id:%s temp:%s\n", "$ID" "$DEGC"
else
	printf "%s %s degC\n" "$ID" "$DEGC";
fi
done 3< $DEV

rm -f $LOCK
Commit	Line	Data
	1	#!/bin/bash
	2
	3	DEV=/dev/ttyUSB0
	4	TIMEOUT=5
	5	LOCK=/var/tmp/readtemp.lock
	6
	7	SYSDEV=/sys/bus/usb/devices
	8	for i in $SYSDEV/*
	9	do
	10	if [ -f "$i/interface" ]
	11	then
	12	if grep -q "CP2102 USB to UART" "$i/interface"
	13	then
	14	DEV=/dev/$(basename `ls -d $i/ttyUSB* `)
	15	# dont break here, keep going so we get the last one
	16	# break
	17	fi
	18	fi
	19	done
	20
	21	if ! lockfile -r 3 -l 5 $LOCK
	22	then
	23	echo "Failed to obtain lock"
	24	exit;
	25	fi
	26
	27	if ! stty --file=$DEV \| grep -q 'speed 19200'
	28	then
	29	stty --file=$DEV 19200
	30	sleep 1
	31	fi
	32
	33	if ! stty --file=$DEV \| grep -q '-echo'
	34	then
	35	stty --file=$DEV -echo
	36	sleep 1
	37	fi
	38
	39	echo -n "t" >> $DEV
	40
	41	MODE=plain
	42	if [ $# -ge 1 ] && [ "$1" == "-c" ]; then
	43	MODE=cacti
	44	fi
	45
	46	while read -t $TIMEOUT -u 3 CODE ID TEM OTH; do
	47	# last one
	48	if [ "$CODE" == "END" ]; then
	49	break;
	50	fi
	51
	52	# not a valid line
	53	if [ "$CODE" != "TEMP" ]; then
	54	echo "ERROR CODE=$CODE ID=$ID TEM=$TEM"
	55	continue;
	56	fi
	57
	58	# truncate for paranoia
	59	TEM=${TEM:0:4}
	60
	61	# calculate degrees from the hex code
	62	DEGC=`echo "16 i $TEM A i 4 k 0.0625 * p" \| dc`
	63	# display the result
	64	if [ $MODE == "cacti" ]; then
	65	printf "id:%s temp:%s\n", "$ID" "$DEGC"
	66	else
	67	printf "%s %s degC\n" "$ID" "$DEGC";
	68	fi
	69	done 3< $DEV
	70
	71	rm -f $LOCK