commit 9e4a28db2e1f07519c90921699b14d21624c58fc
Author: Lucas Pleß <lucas@xleave.de>
Date:   Wed Feb 22 00:50:55 2017 +0100

    initial commit

diff --git a/docs/74HC_HCT595.pdf b/docs/74HC_HCT595.pdf
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index 0000000..05c3f89
Binary files /dev/null and b/docs/74HC_HCT595.pdf differ
diff --git a/docs/M62429.pdf b/docs/M62429.pdf
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index 0000000..afa86d0
Binary files /dev/null and b/docs/M62429.pdf differ
diff --git a/firmware_arduino_mini/firmware_arduino_mini.ino b/firmware_arduino_mini/firmware_arduino_mini.ino
new file mode 100644
index 0000000..d4db3a8
--- /dev/null
+++ b/firmware_arduino_mini/firmware_arduino_mini.ino
@@ -0,0 +1,157 @@
+
+#define PIN_DATA_VOL_A   5
+#define PIN_DATA_VOL_B   6
+#define PIN_DATA_VOL_C   7
+#define PIN_DATA_VOL_D   8
+#define PIN_DATA_CLOCK   9
+#define PIN_SR_DATA      2
+#define PIN_SR_LTCH      3
+#define PIN_SR_CLOCK     4
+#define PIN_LED          13
+
+long tick;
+uint16_t relaisData = 0xffff;
+
+void setup() {
+  pinMode(PIN_DATA_VOL_A, OUTPUT);
+  pinMode(PIN_DATA_VOL_B, OUTPUT);
+  pinMode(PIN_DATA_VOL_C, OUTPUT);
+  pinMode(PIN_DATA_VOL_D, OUTPUT);
+  pinMode(PIN_DATA_CLOCK, OUTPUT);
+  pinMode(PIN_SR_DATA, OUTPUT);
+  pinMode(PIN_SR_LTCH, OUTPUT);
+  pinMode(PIN_SR_CLOCK, OUTPUT);
+  pinMode(PIN_LED, OUTPUT);
+
+  // shift out one time 0xffff to set all pins high. our relais boards
+  // are active-low
+  shiftRelais(relaisData);
+}
+
+void shiftRelais(uint16_t data) {
+  digitalWrite(PIN_SR_LTCH, LOW);
+  shiftOut(PIN_SR_DATA, PIN_SR_CLOCK, MSBFIRST, (data >> 8));
+  shiftOut(PIN_SR_DATA, PIN_SR_CLOCK, MSBFIRST, data);
+  digitalWrite(PIN_SR_LTCH, HIGH);
+}
+
+// channel is our "room" 1-5 / state for switching between A or B input
+void switchInputs(uint8_t channel, bool state) {
+
+  // 16 . . . . . . . . . . . . . . . . . . . 0
+
+  // we use a simple switch case with some if instead of
+  // tricky bitmagic to allow a more visual programming 
+  // of our relais configuration
+  
+  switch(channel) {
+    case 1:
+      if(state) {
+        relaisData |= _BV(7) | _BV(6);
+      } else {
+        relaisData &= ~(_BV(7) | _BV(6));
+      }
+      break;
+    case 2:
+      if(state) {
+        relaisData |= _BV(5) | _BV(4);
+      } else {
+        relaisData &= ~(_BV(5) | _BV(4));
+      }
+      break;
+    case 3:
+      if(state) {
+        relaisData |= _BV(3) | _BV(2);
+      } else {
+        relaisData &= ~(_BV(3) | _BV(2));
+      }
+      break;
+    case 4:
+      if(state) {
+        relaisData |= _BV(1) | _BV(0);
+      } else {
+        relaisData &= ~(_BV(1) | _BV(0));
+      }
+      break;
+    case 5:
+      if(state) {
+        relaisData |= _BV(9) | _BV(8);
+      } else {
+        relaisData &= ~(_BV(9) | _BV(8));
+      }
+      break;
+  }
+
+  shiftRelais(relaisData);
+  
+}
+
+// control a M62429 Chip for Volume Control
+// function take from here: http://forum.arduino.cc/index.php?topic=244152.0
+void setVolume(uint8_t volume, uint8_t dataPin) {
+  uint8_t bits;
+  uint16_t data = 0; // control word is built by OR-ing in the bits
+
+  // convert attenuation to volume / remember 0 is full volume!
+  volume = (volume > 100) ? 0 : (((volume * 83) / -100) + 83); 
+
+  data |= (0 << 0);
+  data |= (0 << 1);
+  data |= ((21 - (volume / 4)) << 2);
+  data |= ((3 - (volume % 4)) << 7);
+  data |= (0b11 << 9);
+
+  for (bits = 0; bits < 11; bits++) {
+    _delay_us(2);
+    digitalWrite(dataPin, 0);
+    _delay_us (2);
+    digitalWrite(PIN_DATA_CLOCK, 0);
+    _delay_us (2);
+    digitalWrite(dataPin, (data >> bits) & 0x01);
+    _delay_us (2);
+    digitalWrite(PIN_DATA_CLOCK, 1);
+  }
+  
+  _delay_us(2);
+  digitalWrite(dataPin, 1); // final clock latches data in
+  _delay_us (2);
+  digitalWrite(PIN_DATA_CLOCK, 0);
+}
+
+
+uint8_t volume = 0;
+uint8_t room = 0;
+bool flag = false;
+
+void loop() {
+
+  long currentMillis = millis();
+
+
+  if(currentMillis - tick > 500) {
+
+    setVolume(volume, PIN_DATA_VOL_A);
+    setVolume(volume, PIN_DATA_VOL_B);
+    setVolume(volume, PIN_DATA_VOL_C);
+    setVolume(volume, PIN_DATA_VOL_D);
+
+    volume++;
+    if(volume > 100) volume = 0;
+
+    switchInputs(room++, flag);
+
+    if(room == 5) {
+      room = 0;
+      flag = !flag;
+    }
+    
+    tick = currentMillis;
+  }
+
+  
+
+}
+
+
+
+
diff --git a/firmware_esp/firmware_esp.ino b/firmware_esp/firmware_esp.ino
new file mode 100644
index 0000000..4907a15
--- /dev/null
+++ b/firmware_esp/firmware_esp.ino
@@ -0,0 +1,67 @@
+#include <Homie.h>
+#include <ArduinoOTA.h>
+
+
+
+long lastTickMillis;
+
+HomieNode volumeNode("volume", "volume");
+HomieNode switchNode("switches", "switch");
+
+bool nodeInputHandlerVolume(const HomieRange& range, const String& value) {
+  Homie.getLogger() << "VOL " << range.index << " set to " << value << endl;
+  
+  int r = value.toInt();
+  if(r >= 0 && r <= 127) {
+    
+      volumeNode.setProperty("output").setRange(range).send(value);
+
+      return true;
+  }
+  
+  return false;
+}
+
+bool nodeInputHandlerVolume(const HomieRange& range, const String& value) {
+  Homie.getLogger() << "VOL " << range.index << " set to " << value << endl;
+      
+  switchNode.setProperty("switch").setRange(range).send(value);
+
+  
+  return true;
+}
+
+
+
+void setup() {
+  Serial.begin(115200);
+  Serial << endl << endl;
+  
+  Homie_setFirmware("audiocontroller", "1.0.0");
+
+  volumeNode.advertiseRange("volume", 1, 4).settable(nodeInputHandlerVolume);
+  switchNode.advertiseRange("switch", 1, 4).settable(nodeInputHandlerVolume);
+
+  Homie.setup();
+  Homie.getLogger() << "started" << endl;
+
+  ArduinoOTA.setHostname(Homie.getConfiguration().deviceId);
+  ArduinoOTA.begin();
+  
+}
+
+void loop() {
+  Homie.loop();
+  ArduinoOTA.handle();
+
+  long currentMillis = millis();
+
+  if(currentMillis - lastTickMillis >= 100) {
+
+    
+    
+    lastTickMillis = currentMillis;
+  }
+  
+}
+