OpenWrt – Rev 4

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#!/bin/sh

GPIO=$1

trap "" INT HUP

echo $GPIO > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio${GPIO}/direction

while true; do
        echo 1 > /sys/class/gpio/gpio${GPIO}/value
        sleep 1
        echo 0 > /sys/class/gpio/gpio${GPIO}/value
        sleep 180
done