Let's try IoT Prototyping / Fixed point camera with RPi (gpio6 / implementation)

gpio6_shooting.bash

#!/bin/bash

BCM_PIN=6

trap 'exit 0' 1 2 3 15

function _gpio_read() {
    # $1 = reading GPIO pin (number of BMC pin)
    raspi-gpio get $1 | awk -v RS=" " -F "=" -v k="level" '$1==k {print $2}'
}

raspi-gpio set $BCM_PIN ip pu
PREV=$(_gpio_read $BCM_PIN)

while true
do
    CURR=$(_gpio_read $BCM_PIN)
    if [ "$PREV" -ne "$CURR" ]; then
        echo "Trigger on $0"
        echo "Diff!: $PREV -> $CURR"
        if [ "$CURR" -eq 0 ]; then
            echo "shooting!" | nc localhost 19000
        fi
        echo "$0 End."
    fi
    PREV=$CURR
    sleep 0.1
done

12/29/2021: Updating for using raspi-gpio from gpio(Wriring Pi). ref: https://qiita.com/ma2shita/items/b11045717333bcd79d15