====== c-info-wand ======

{{:projects:c-info-wall.jpg?200|}}

===== elektronic =====

  * connected launchpad
  * 3 RGB LED stripes (common +)
  * MOSFETs: IRL540N
  * Schaltung ist wie beim Ingress-Table: https://github.com/c-base/ingress-table#led-driver-circuit
  * PWM-PINs in RGB-Dreier-Gruppen:
    * erste Gruppe: PM_3, PD_1, PD_0
    * zweite Gruppe: PL_4, PL_5, PM_1
    * dritte Gruppe: PM_7, PA_7, PM_6
  * Pinout siehe: http://energia.nu/img/EK-TM4C1294XL.jpg
===== code =====

  * Sourcecode uses energia: http://energia.nu/
  * Sourcecode on github: https://gist.github.com/uwekamper/ebefbdc992248407a1e7

<code>
/*
  Fade for c-info wall at c-base with MQTT
*/

#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>

// Apparently the preprocessor variables B0 and B1 are already taken.
// Therefore we use the prefix CBASE

#define CBASER0 PM_3
#define CBASEG0 PD_1
#define CBASEB0 PD_0

#define CBASER1 PL_4
#define CBASEG1 PL_5
#define CBASEB1 PM_1

#define CBASER2 PM_7
#define CBASEG2 PA_7
#define CBASEB2 PM_6

int brightness = 50;    // how bright the LED is
int fadeAmount = 1;    // how many points to fade the LED by
int fadeCounter = 0;

// MQTTServer to use
char server[] = "c-beam.cbrp3.c-base.org";

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Received message for topic ");
  Serial.print(topic);
  Serial.print("with length ");
  Serial.println(length);
  Serial.println("Message:");
  Serial.write(payload, length);
  Serial.println();
  fadeCounter = 20;
}

EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);


void setup()  { 
  pinMode(CBASER0, OUTPUT);
  pinMode(CBASEG0, OUTPUT);
  pinMode(CBASEB0, OUTPUT);
  pinMode(CBASER1, OUTPUT);
  pinMode(CBASEG1, OUTPUT);
  pinMode(CBASEB1, OUTPUT);
  pinMode(CBASER2, OUTPUT);
  pinMode(CBASEG2, OUTPUT);
  pinMode(CBASEB2, OUTPUT);
  
  Serial.begin(115200);
  
  Serial.print("Ethernet starting.");
  
  // Start Ethernet with the build in MAC Address
  Ethernet.begin(0);

  Serial.print("My IP address: ");
  Serial.println(Ethernet.localIP());
} 

void doFade() {
  while(true) {
    if (brightness < 50) {
      fadeAmount = 1;
      brightness = 50;
      return;
    }
  
    if (brightness >= 200) {
      fadeAmount = -1;
    }
  
    // There was some problem with the upper-most LED stripe.
    // That is why we just set this one to full brightness forever.
    if(fadeCounter > 0) {
      analogWrite(CBASER0, 0);
      analogWrite(CBASEG0, 0);
      analogWrite(CBASEB0, 255);
    } 
    else {
      analogWrite(CBASER0, 255);
      analogWrite(CBASEG0, 0);
      analogWrite(CBASEB0, 0);
    }
  
    // The rest of the wall is pulsing.
    analogWrite(CBASER1, brightness);
    analogWrite(CBASEG1, brightness);
    analogWrite(CBASEB1, brightness);
    analogWrite(CBASER2, brightness);
    analogWrite(CBASEG2, brightness);
    analogWrite(CBASEB2, brightness);
    delay(10);
    brightness = brightness + fadeAmount;
    
  }
}

void loop() {
  if (!client.connected()) {
    Serial.println("Disconnected. Reconnecting....");

    if(!client.connect("c-info")) {
      Serial.println("Connection failed");
    } else {
      Serial.println("Connection success");
      if(client.subscribe("user/boarding")) {
        Serial.println("Subscription 2 successfull");
      }
    }
  }
  
  client.loop();
  Serial.print("fadeCounter: ");
  Serial.println(fadeCounter);
  doFade(); 
  if (fadeCounter > 0) {
    fadeCounter--;
  }
  delay(800);
}

</code>