Turn a pin from Raspberry on at a time for a duration period.

pinsched.sh

    #!/bin/bash
    # call using ./pinsched <time> <duration> <pin number>
    # example: ./pinsched 14:00 2hours 5

    timeat="$1"
    duration="$2"
    ledpim="$3"

    endtime=`date +%H:%M -d " $timeat today + $duration"`

    gpio -g mode $ledpin out
    echo "gpio -g write $ledpin 1" | at $timeat
    echo "gpio -g write $ledpin 0" | at $endtime