log.sh

#!/bin/bash

# find the sensor_id by looking for a suitable device
sensorid=`find /sys/bus/w1/devices/* -type l | grep -o '[0-9]*-.*$'  | head -n 1`

# extract temperature from file
filename="/sys/bus/w1/devices/$sensorid/w1_slave"
T=`tail -n 1 "$filename" | grep -o "[0-9]*$"`

# change units to celsius
t=${T:0:2}.${T:2:3}

# get the date & time
unix=`date "+%s"`
d=`date "+%Y-%m-%d %H:%M:%S %Z"`

# turn into JSON
json="{ \"ts\": $unix, \"date\": \"$d\", \"temperature\": $t, \"sensor_id\": \"$sensorid\" }"

# send to CouchDB
curl -X POST -H "Content-Type: application/json" -d "$json" "http://localhost:5984/logger/"