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October 12, 2014 23:06
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Arduino Shower Controller
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| /* | |
| Shower Contoller | |
| 8/9/2010 - Ryan Kilkenny | |
| features: | |
| -relays to control two valves and a pump (main & recirculation) | |
| * digital pins 13,12,11 | |
| -thermistor to detect temp of hot water pipe | |
| -hall effect sensor to detect when soap is in use | |
| Vers. 1 - when turned on, arduino will: | |
| 1. check temp of hot water pipe | |
| 2. if too cold, will open recirculation valve and turn on pump | |
| - continue to check temp until temp rises to cutoff setting | |
| - turn off pump, close recirc valve | |
| 3. turn on main valve | |
| */ | |
| #include <math.h> | |
| #define MAINVALVE_PIN 10 | |
| #define RECIRCVALVE_PIN 12 | |
| #define PUMP_PIN 11 | |
| #define THERM_PIN 0 | |
| //global vars | |
| double temperatureCutoff = 91.0; | |
| boolean showerOn = false; | |
| boolean testMode = false; | |
| void setup() | |
| { | |
| // initialize the digital pins as an output: | |
| pinMode(MAINVALVE_PIN, OUTPUT); | |
| pinMode(RECIRCVALVE_PIN, OUTPUT); | |
| pinMode(PUMP_PIN, OUTPUT); | |
| Serial.begin(115200); | |
| SetRelay(MAINVALVE_PIN, false); | |
| SetRelay(RECIRCVALVE_PIN, false); | |
| SetRelay(PUMP_PIN, false); | |
| } | |
| void loop() | |
| { | |
| if(testMode) | |
| { | |
| SetRelay(MAINVALVE_PIN, false); | |
| SetRelay(RECIRCVALVE_PIN, false); | |
| SetRelay(PUMP_PIN, false); | |
| delay(3000); | |
| //readThermistor(); | |
| /* | |
| delay(2000); | |
| SetRelay(MAINVALVE_PIN, true); | |
| delay(3000); | |
| SetRelay(RECIRCVALVE_PIN, true); | |
| delay(3000); | |
| */ | |
| SetRelay(PUMP_PIN, true); | |
| delay(3000); | |
| } | |
| else | |
| { | |
| if(!showerOn) | |
| { | |
| SetRelay(MAINVALVE_PIN, false); | |
| SetRelay(RECIRCVALVE_PIN, false); | |
| SetRelay(PUMP_PIN, false); | |
| delay(3000); | |
| Recirculate(); | |
| Shower(); | |
| } | |
| } | |
| } | |
| /*functions*/ | |
| double Thermister(int RawADC) { | |
| double Temp; | |
| Temp = log(((10240000/RawADC) - 10000)); | |
| Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp)); | |
| Temp = Temp - 273.15; // Convert Kelvin to Celcius | |
| Temp = (Temp * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit | |
| return Temp; | |
| } | |
| void SetRelay(int pin, boolean on) | |
| { | |
| if(on) | |
| { | |
| digitalWrite(pin, HIGH); // set the LED on | |
| } else { | |
| digitalWrite(pin, LOW); | |
| } | |
| } | |
| /*events*/ | |
| void Recirculate() | |
| { | |
| Serial.println("Recirculating..."); | |
| SetRelay(MAINVALVE_PIN, false); | |
| SetRelay(RECIRCVALVE_PIN, true); | |
| Serial.println("Recirculation valve: on"); | |
| delay(1000); | |
| SetRelay(PUMP_PIN, true); | |
| Serial.println("Recirculation pump: on"); | |
| double currentTemp = Thermister(analogRead(THERM_PIN)); | |
| while (currentTemp <= temperatureCutoff) | |
| { | |
| delay(3000); | |
| currentTemp = Thermister(analogRead(THERM_PIN)); | |
| Serial.println(int(currentTemp)); | |
| } | |
| SetRelay(PUMP_PIN, false); | |
| Serial.println("Recirculation pump: off"); | |
| delay(3000); | |
| SetRelay(RECIRCVALVE_PIN, false); | |
| Serial.println("Recirculation valve: off"); | |
| delay(3000); | |
| } | |
| void Shower() | |
| { | |
| Serial.println("Starting Shower..."); | |
| delay(1000); | |
| SetRelay(MAINVALVE_PIN, true); | |
| SetRelay(RECIRCVALVE_PIN, false); | |
| SetRelay(PUMP_PIN, false); | |
| delay(1000); | |
| showerOn = true; | |
| Serial.println("Shower valve: on"); | |
| } | |
| /*Tests*/ | |
| void readThermistor() | |
| { | |
| double currentTemp = Thermister(analogRead(THERM_PIN)); | |
| Serial.println(int(currentTemp)); | |
| delay(1000); | |
| } |
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