Commit 9736af10 authored by Roland Richter's avatar Roland Richter

Add example 'Lichtfalle' for LinuxWochen Linz workshop

parent dbd1389f
/* Lichtfalle.ino
* Copyright 2015 Roland Richter
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty
* See the GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <>.
const int BarrierPin = 2;
const int BuzzPin = 12;
volatile boolean alarm = false;
// Interrupt service routine
void triggerAlarm()
alarm = true;
void setup()
pinMode(BarrierPin, INPUT);
pinMode(BuzzPin, OUTPUT);
attachInterrupt(0, triggerAlarm, RISING); // Zeile 38
// Interrupt 0 = Pin 2 auf UNO
void loop()
if (alarm) {
tone(BuzzPin, 880);
digitalWrite(LED_BUILTIN, HIGH);
else {
digitalWrite(LED_BUILTIN, LOW);
1. Warum wird in Zeile 38 der Interrupt mit einer steigenden Flanke ("RISING")
verknüpft? Was würde passieren, wenn man hier "FALLING" oder "CHANGE"
verwenden würde?
2. Erweitere das Programm so, dass der Alarm beendet wird, sobald die
Lichtschranke nicht mehr unterbrochen ist.
3. Ändere den Alarm: so lange die Lichtschranke unterbrochen ist, soll
die LED blinken und den Ton parallel dazu ein- und ausgeschaltet werden.
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