first commit

README.md

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+# LED Annunciator
+A quick and dirty little device to inform people you are on the phone or in an
+appointment with a traffic light. The state information are generated by a
+groupware or messaging application that writes a single letter code into a file.
+
+| Command | Meaning                   |
+|---------|---------------------------|
+| a       | Turn on all leds          |
+| 0       | Turn off all leds         |
+| r       | Switch to the red line    |
+| g       | Switch to the green line  |
+| y       | Switch to the yellow line |
+
+AnnunciatorServer takes the code and sends it via serial port to the device.
+Alternatively, similar commands can be send by an infrared remote control.
+
+## Hardware
+An Arduino Nano with nine leds on pins D02 - D10. The leds are arranged in three
+rows (red, yellow, green) of three leds each.
+A YS1838B infrared receiver is connected to D11 and sits on top facing
+backwards.
+
+## Software
+### led-annunciator
+The Arduino code.
+
+### checkLedPins
+A program to check the led/pin mapping by turning them on one by one.
+
+### annunciatorServer
+The shell script that checks a commandfile and sends single-character
+commands to the serial port.
+This is useful when the commandfile needs to sit on a network share.
+
+## Room for improvements
+- Sometimes the ir receiver starts to send random codes
+- As all leds are connected individually, many more commands can be defined.

annunciatorServer/annunciatorServer.sh

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+#!/bin/bash
+
+port=/dev/ttyUSB0
+cmdfile=~/annunciatorServer.txt
+
+## Setup serial port
+stty -F $port ispeed 9600 ospeed 9600 -ignpar cs8 -cstopb -hupcl
+
+## Setup files
+touch $cmdfile
+
+## Monitor file for new commands
+while true
+do
+	incmd=$(head -c 1 $cmdfile)
+	if [ _$incmd != _ ]
+	then
+		echo $incmd > $port
+		> $cmdfile
+	fi
+	sleep 1
+done
+

checkLedPins/checkLedPins.ino

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+// Pins
+int r1 =  5;   // Rot  1 an Pin  5
+int r2 =  6;   // Rot  2 an Pin  6
+int r3 =  4;   // Rot  3 an Pin  4
+int y1 =  7;   // Gelb 1 an Pin  7
+int y2 =  9;   // Gelb 2 an Pin  9
+int y3 =  8;   // Gelb 3 an Pin  8
+int g1 =  2;   // Grün 1 an Pin  2
+int g2 = 10;   // Grün 2 an Pin 10
+int g3 =  3;   // Grün 3 an Pin  3
+int ir = 11;   // IR Empfänger an Pin 11
+
+void setup() {
+  pinMode(r1, OUTPUT);
+  pinMode(r2, OUTPUT);
+  pinMode(r3, OUTPUT);
+  pinMode(y1, OUTPUT);
+  pinMode(y2, OUTPUT);
+  pinMode(y3, OUTPUT);
+  pinMode(g1, OUTPUT);
+  pinMode(g2, OUTPUT);
+  pinMode(g3, OUTPUT);
+}
+
+void loop() {
+  for (int i = 2; i <= 10; i++) {
+    digitalWrite(i, LOW);
+  }
+  digitalWrite(r1, HIGH);
+  delay(1000);
+  digitalWrite(r2, HIGH);
+  delay(1000);
+  digitalWrite(r3, HIGH);
+  delay(1000);
+  digitalWrite(y1, HIGH);
+  delay(1000);
+  digitalWrite(y2, HIGH);
+  delay(1000);
+  digitalWrite(y3, HIGH);
+  delay(1000);
+  digitalWrite(g1, HIGH);
+  delay(1000);
+  digitalWrite(g2, HIGH);
+  delay(1000);
+  digitalWrite(g3, HIGH);
+  delay(5000);
+}

led-annunciator/led-annunciator.ino

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+
+
+// Pins
+int r1 =  5;   // Rot  1 an Pin  5
+int r2 =  6;   // Rot  2 an Pin  6
+int r3 =  4;   // Rot  3 an Pin  4
+int y1 =  7;   // Gelb 1 an Pin  7
+int y2 =  9;   // Gelb 2 an Pin  9
+int y3 =  8;   // Gelb 3 an Pin  8
+int g1 =  2;   // Grün 1 an Pin  2
+int g2 = 10;   // Grün 2 an Pin 10
+int g3 =  3;   // Grün 3 an Pin  3
+int ir = 11;   // IR receiver an Pin 11
+
+// Prepare ir device
+#include <IRremote.h>
+IRrecv irrecv(ir);
+decode_results results;
+
+void setup() {
+  // LED Pins
+  pinMode(r1, OUTPUT);
+  pinMode(r2, OUTPUT);
+  pinMode(r3, OUTPUT);
+  pinMode(y1, OUTPUT);
+  pinMode(y2, OUTPUT);
+  pinMode(y3, OUTPUT);
+  pinMode(g1, OUTPUT);
+  pinMode(g2, OUTPUT);
+  pinMode(g3, OUTPUT);
+  pinMode(ir, INPUT);
+
+  // IR Receiver
+  irrecv.enableIRIn(); // Activate IR Pin
+
+  // Serielle Schnittstelle
+  Serial.begin(9600);
+}
+
+
+void loop() {
+
+  // SERIAL
+  while (Serial.available()) {
+    String rcv_sr = Serial.readString();
+
+    // Send data to serial port
+    Serial.println("RX serial: " + rcv_sr);
+
+    // Switch LEDs
+    switch (rcv_sr[0]) {
+      case 'g' :
+        led_allOff();
+        led_greenLine();
+        break;
+
+      case 'a' :
+        led_greenLine();
+        led_redLine();
+        led_yllwLine();
+        break;
+
+      case 'y' :
+        led_allOff();
+        led_yllwLine();
+        break;
+
+      case 'r' :
+        led_allOff();
+        led_redLine();
+        break;
+
+      case '0' :
+        led_allOff();
+        break;
+    }
+
+  }
+
+  // IR
+  if (irrecv.decode(&results)) {
+    int rcv_ir = results.value;
+
+    // Send data to serial port
+    Serial.println("RX ir: " + String(rcv_ir));
+
+    // Switch LEDs
+    switch (rcv_ir) {
+      case -23971 : //Taste 1
+        led_allOff();
+        led_greenLine();
+        break;
+
+      case 25245 : //Taste 2
+        led_allOff();
+        led_yllwLine();
+        break;
+
+      case -7651 : //Taste 2
+        led_allOff();
+        led_redLine();
+        break;
+
+      case 26775 : //Taste 0
+        led_allOff();
+        break;
+
+      case -26521 : //Taste +100
+        led_greenLine();
+        led_redLine();
+        led_yllwLine();
+        break;
+
+    }
+
+    // ReArm IR
+    irrecv.resume();
+  }
+}

led-annunciator/led_commands.ino

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+void led_allOff() {
+  digitalWrite (r1, LOW);
+  digitalWrite (r2, LOW);
+  digitalWrite (r3, LOW);
+  digitalWrite (g1, LOW);
+  digitalWrite (g2, LOW);
+  digitalWrite (g3, LOW);
+  digitalWrite (y1, LOW);
+  digitalWrite (y2, LOW);
+  digitalWrite (y3, LOW);
+}
+
+void led_redLine() {
+  digitalWrite (r1, HIGH);
+  digitalWrite (r2, HIGH);
+  digitalWrite (r3, HIGH);
+}
+
+void led_yllwLine() {
+  digitalWrite (y1, HIGH);
+  digitalWrite (y2, HIGH);
+  digitalWrite (y3, HIGH);
+}
+
+void led_greenLine() {
+  digitalWrite (g1, HIGH);
+  digitalWrite (g2, HIGH);
+  digitalWrite (g3, HIGH);
+}