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/*
Infinity ALPHA Steuerung

by Simon Krause
*/

#include "SPI.h"
#include "Adafruit_WS2801.h"

float watertemp; //Aktuelle Wassertememperatur
float pcbtemp; //Aktuelle Boardtemperatur
int fanport = 0; //RPM-Signal an PIN 2/Interrupt 0
int rpmcount = 0; //hilfvariable fuer RPM_messung
int rpm = 0; //aktueller Wert der RPM-Messung
int lrpm; //letzter Wert der RPM-Messung
int fanintervall = 5000; //RPM-Messung ueber 5 Sekunden
unsigned long lastmillis = 0;
int fadeamount = 2; //Fadeverlauf
int watertemppin = 5; //Pin des Temperaturfuehlers des Wasser
int pcbtemppin = 4; //Pin des Temperaturfuehlers des Wasser
int led = 6; //Anzahl der WS2801-LEDs

uint8_t dataPin = 8; //WS2801-Data an Pin 8
uint8_t clockPin = 9; //WS2801-Clock an Pin 9

Adafruit_WS2801 strip = Adafruit_WS2801(led, dataPin, clockPin);

void setup() {
Serial.begin(9600); //Serialoutput auf Port 9600 aktiviert
attachInterrupt(fanport, rpm_fan, FALLING);
strip.begin(); //WS2801 Inistialisierung
strip.show();
PowerOn(30);
}

void loop() {
watertemp = Thermister(analogRead(watertemppin)); //Temperatur ermitteln
pcbtemp = Thermister(analogRead(pcbtemppin)); //Temperatur ermitteln

if (millis() - lastmillis >= fanintervall){
detachInterrupt(fanport);
rpm = rpmcount * (30000 / fanintervall);
lrpm = rpm;
rpmcount = 0;
lastmillis = millis();
attachInterrupt(fanport, rpm_fan, FALLING);
}

if (Serial.available() > 0) { //Steuerung ueber Serial
int comand = Serial.read(); //Daten in comand speichern
if (comand == 49) {
PowerOn(30);
}
if (comand == 50) {
Serial.println(watertemp);
}
}
}

void PowerOn(int fadespeed) {
float brightness = 0;
float i = 0;
unsigned long time;
boolean fadeup = true;
time = millis();
while(brightness < 255 && fadeup == true) {
brightness = pow(i,fadeamount)/(pow(i,fadeamount)+pow((1-i),fadeamount))*255;
for (int i=0; i < led; i++) {
strip.setPixelColor(i, brightness, brightness, brightness);
}
strip.show();
if ((millis()-time)>fadespeed) {
i = i + 0.05;
time = millis();
}
}

if(brightness == 255) {
fadeup = false;
i = 0;
time = millis();
}

while(brightness > 0 && fadeup == false) {
brightness = 255 - (pow(i,fadeamount)/(pow(i,fadeamount)+pow((1-i),fadeamount))*255);
for (int i=0; i < led; i++) {
strip.setPixelColor(i, brightness, brightness, brightness);
}
strip.show();
if ((millis()-time)>fadespeed) {
i = i + 0.05;
time = millis();
}
}
}


double Thermister(float RawADC) { //Funktion zur Temperaturbestimmung
double Temp;
Temp = log(((10240000/RawADC) - 10000));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
Temp = Temp - 273.15; //Wert in Celsius konvertieren
return Temp;
}


void rpm_fan(){
rpmcount++;
}