Quick background, very new to coding.. Help desk and windows server support for 15 years, has helped me little for this! But I am trying.
I put together some parts to make a tstat for my garage furnace.
Uno
5v relays
DHT22
HRC501
W5500 ethernet wired in, not a shield.
The code is built from examples I've found, how to's I've done, and guides that I've read. I had a solid running thermostat, and I decided to add web; turns out...
My HTTP abilities are non existent, and I feel it shows.
My request is for some tips, tricks, links or directions to go in to better my code in general. Ive briefly read about using ajax/java to do partial updates on the page, and I have read about other options that I really dont have any idea if it would even work. So Im hoping I can get some help building bridges here as I grow.
Some pieces are relics from stages as i went, but i think that most will get the flow
Any help is greatly appreciated!
#include <SPI.h>
#include <Ethernet.h>
#define tempIn 7
#define heatTrigger 6
#define humTrigger 4
#define motionIn 5
#include <DHT.h>
#include <neotimer.h>
DHT dht(tempIn, DHT22);
float setTemp = 65;
float setHum = 40;
float tempVarianceNoMotion = 10;
float tempVarianceMotion = 1;
float humVariance = 1;
bool heatOn = false;
bool humOn = false;
bool ledOn = false;
unsigned long safetyTimeout = 1000;
Neotimer safetyTimer = Neotimer(safetyTimeout);
unsigned long logTimeout = 10000;
Neotimer logTimer = Neotimer(logTimeout);
unsigned long motionTimeout = 600000;
Neotimer motionTimer = Neotimer(motionTimeout);
bool motion = false;
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = {192,168,11,85};
byte gateway[] = { 192, 168, 11, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(80);
String readString;
String tempString;
String activeString;
String awayString;
void setup() {
Ethernet.init(10);
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
Serial.begin(115200);
dht.begin();
pinMode(humTrigger, OUTPUT);
pinMode(heatTrigger, OUTPUT);
pinMode(motionIn, INPUT);
pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
// get temp and humidity from DHT22 sensor
float hum = dht.readHumidity();
float tempF = (dht.readTemperature() * 1.8) + 32;
unsigned long motionRemain = (motionTimer.getRemaining());
EthernetClient client = server.available();
if (client) {
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (readString.length() < 100) {
readString += c;
}
if (c == '\n') {
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.println("<HTML>");
client.println("<HEAD>");
client.println("<TITLE>Arduino Garage Thermostat</TITLE>");
client.println("</HEAD>");
client.println("<BODY>");
client.println("<H1>Arduino Garage Thermostat</H1>");
client.println(String(tempF) + " :Temp
" + String(hum) + " :rH%</p>" + String(setTemp) + " :SetPoint
" + (motion ? String(setTemp-tempVarianceMotion) : String(setTemp-tempVarianceNoMotion)) + " :Adjusted</p>" + "Heat: " + (heatOn ? "On " : "Off")+ "
Humidity: " + (humOn ? "On " : "Off") + "
Away Mode in: ");
if (!motionTimer.started()){
if (motion==true){client.println(" MOTION DETECTED</p>");}
else{
client.println(" AWAY MODE ACTIVE</p>");}}
else{
client.println(String(motionRemain/60000) + " mins </p>");}
//web input data
client.println("<FORM ACTION='/' method=get >"); //uses IP/port of web page
client.println("<INPUT TYPE=TEXT NAME='TEMP' VALUE='' SIZE='4' MAXLENGTH='2'> Temp Setting (50-80)
");
client.println("<INPUT TYPE=TEXT NAME='ACTIVE' VALUE='' SIZE='4' MAXLENGTH='2'> Active Variance (0-5)
");
client.println("<INPUT TYPE=TEXT NAME='AWAY' VALUE='' SIZE='4' MAXLENGTH='2'> Away Variance (10-20)
");
client.println("<INPUT TYPE=SUBMIT NAME='submit' VALUE='Submit'>");
client.println("</FORM>");
client.println("
");
//take submissions and do something with it
tempString = readString.substring(11,13);
activeString = readString.substring(21,22);
awayString = readString.substring(28,30);
if(readString.indexOf("submit") >0){
if (tempString == "&A"){}
else{
if ((tempString.toInt()<50) || (tempString.toInt()>80)){}
else{setTemp = tempString.toInt();}}
if(activeString == "A" || activeString == "W" || activeString == "&"){}
else{
if ((activeString.toInt()<0) || (activeString.toInt()>5)){}
else{tempVarianceMotion = activeString.toInt();}}
if(awayString == "&s" || awayString == "bm" || awayString == "su" || awayString == "ub"){}
else{
if ((awayString.toInt() < 10) || (awayString.toInt() > 20)){}
else{tempVarianceNoMotion = awayString.toInt();}}
client.println("<meta http-equiv=refresh content=1;URL='http://192.168.11.85/'>");
client.println("</BODY>");
client.println("</HTML>");
delay(1);
client.stop();
}
else{
client.println("</BODY>");
client.println("</HTML>");
delay(1);
client.stop();
}
//clearing string for next read
readString="";
}
}
}
}
if (digitalRead(motionIn)) {
if (!motion) {
//Serial.println(" motion mode");
}
motion = true;
motionTimer.reset();
}
else if(motion) {
if (motionTimer.done()) {
motion = false;
motionTimer.reset();
//Serial.println(" no motion mode");
}
else if (!motionTimer.waiting()) {
motionTimer.start();
//Serial.println(" no motion countdown started");
}
}
// if we cant read data properly from the sensor, heat and humidity will default to off
bool sensorUnplugged = isnan(tempF) || isnan(hum);
if (sensorUnplugged) {
heatOn = false;
humOn = false;
} else {
// determine if heat output pin should be switched on or off or stay the same
if ((!safetyTimer.started() || safetyTimer.done()) && ((motion && tempF <= (setTemp - tempVarianceMotion)) || (!motion && tempF <= (setTemp - tempVarianceNoMotion)))) {
heatOn = true;
safetyTimer.reset();
} else if (tempF >= setTemp) {
heatOn = false;
safetyTimer.start();
}
// determine if humidity output pin should be switched on or off or stay the same
if (hum < (setHum - humVariance)) {
humOn = true;
} else if (hum > (setHum + humVariance)) {
humOn = false;
}
}
// set the heat/humidity pin output values
digitalWrite(heatTrigger, heatOn);
digitalWrite(humTrigger, humOn);
// log the temp/humidity and heater status on a timer
if (logTimer.repeat()) {
ledOn = !ledOn;
digitalWrite(LED_BUILTIN, ledOn);
if (sensorUnplugged) {
Serial.println("Failed to read data from temperature/humidity sensor");
} else {
Serial.print("SetPoint/Adjusted/Temp/rH%: " + String(setTemp) + " " + (motion ? String(setTemp-tempVarianceMotion) : String(setTemp-tempVarianceNoMotion)) + " " + String(tempF) + " " + String(hum) + " Heat: " + (heatOn ? "On " : "Off")+ " Humidity: " + (humOn ? "On " : "Off") + " Motion: ");
if (digitalRead(motionIn)){
Serial.println("Yes");}
else{
Serial.println("No");}
}
}
}
