How to get an IR sensor and motors to work together?

Question

I've managed to connect a IR sensor to GPIO pin 23 and get LIRC to work with one of my remote controls. I've also set irexec up to launch a bash-script that drives motors (connected via open collectors):

#!/bin/bash

gpio -g mode 4 out
gpio -g mode 7 out

function forward {
        gpio -g write 4 1
        gpio -g write 7 1
}

function left {
        gpio -g write 4 0
        gpio -g write 7 1
}

function right {
        gpio -g write 4 1
        gpio -g write 7 0
}

function stop {
        gpio -g write 4 0
        gpio -g write 7 0
}

case $1 in
    "forward")
        forward
        ;;
    "left")
        left
        ;;
    "right")
        right
        ;;
    "stop")
        stop
        ;;
esac

Now, the problem is, after the first key press on the remote control, the motors start to spin but LIRC stops receiving any signals.

I assume writing to pins other than 23 causes the 23rd pin to be lost for lirc_rpi?

Answer 1

I think you need to read a character from keyboard like this.

#!/bin/bash
a=`stty -icanon ; dd bs=1 count=1 2>/dev/null`

gpio -g mode 4 out
gpio -g mode 7 out

function forward {
        gpio -g write 4 1
        gpio -g write 7 1
}

function left {

        gpio -g write 4 0
        gpio -g write 7 1
}

function right {

        gpio -g write 4 1
        gpio -g write 7 0
}

function stop {

        gpio -g write 4 0
        gpio -g write 7 0
}

case $a in

    "f")
        forward
        ;;

    "l")
        left
        ;;

    "r")
        right
        ;;

    "s")
        stop
        ;;

esac

I hope that help you