phone-is-home

arp.sh

#!/bin/bash
# http://www.reddit.com/r/raspberry_pi/comments/1yrudi/a_simple_bash_script_for_detecting_the_presence/

MACS=`arp -an | awk '{print $4}'`
IFS='\n'

read -a  MAC_ARRAY <<< "${MACS}"

for MAC in $MAC_ARRAY
do
    if [ $MAC == {insert your phone mac adress here} ]
    then
        echo "phone is home!"
    else
        echo "phone is not home :("
    fi
done

original.sh

#!/bin/bash
# http://www.reddit.com/r/raspberry_pi/comments/1yrudi/a_simple_bash_script_for_detecting_the_presence/
# Checks for presence of device and speaks a notification

NOW=$(date +"%s")
dayBegin=$(date --date="Today 07:00" +"%s")
dayEnd=$(date --date="Today 22:00" +"%s")

if [ ${NOW} -gt ${dayBegin} ] && [ ${NOW} -lt ${dayEnd} ]; then
    ping 192.168.1.40 -c 1 -W 5 > /home/pi/devicelist
    status=$(grep -i -c '1 received' /home/pi/devicelist)
    prevStatus=$(cat /home/pi/ishome)

    if [ $status = $prevStatus ]; then
        echo "No change"
    else
        if [ $status = "1" ]; then
            echo "Phone detected"
        else
            echo "Phone lost"
        fi
    fi

    echo $status > /home/pi/ishome
fi