Fireplace fan control

Q&A Forum › Category: Home Automation › Fireplace fan control

Larry asked 3 years ago

So I know I should be able to figure this out but for some stupid reason I can’t see the problem.
This is a baby step approach but what I am attempting to do is turn on a relay with temperature change. I have a working program to display the temperature on a webpage, I used GPIO 2 to turn on an led ,later will be replaced with a relay. So to make sure it wasn’t a wiring issue I wrote a simple flashing led and it does what is expected. I then built the circuit to display the temp and it works. I used the Led in place of the relay and programmed a < than statement to fire GPIO 2.
I cannot get the led to fire when I change the temp from ambient to a higher temp, I know this should be simple but I am not seeing the problem. Code compiles ,I have mover the if statement around in the program and still it don’t work. Any help would be appreciated

Start your co

#include <ESP8266WiFi.h>
#include <math.h>
int led=2;

// http://arduino.esp8266.com/stable/package_esp8266com_index.json
unsigned int Rs = 150000;
double Vcc = 3.3;
// WiFi parameters
const char* ssid = “*****”;
const char* password = “************”;
// Pin

WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
Serial.println();
pinMode (led,OUTPUT);

// Connect to WiFi network
WiFi.mode(WIFI_STA);
Serial.println();
Serial.println();
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}
Serial.println(“”);
Serial.println(“WiFi connected”);
// Start the server
server.begin();
Serial.println(“Server started”);
// Print the IP address
Serial.println(WiFi.localIP());
}
void loop() {

delay(1000);
Serial.println(Thermister(AnalogRead()));
float temp = Thermister(AnalogRead());

WiFiClient client = server.available();
client.println(“HTTP/1.1 200 OK”);
client.println(“Content-Type: text/html”);
client.println(“Connection: close”); // the connection will be closed after completion of the response
client.println(“Refresh: 3”); // refresh the page automatically every 5 sec
client.println();
client.println(“<!DOCTYPE html>”);
client.println(“<html xmlns=’http://www.w3.org/1999/xhtml’>”);
client.println(“<head>\n<meta charset=’UTF-8′>”);
client.println(“<title>Fireplaceh Wifi Temp Sensor</title>”);
client.println(“<link href=’https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css’ rel=’stylesheet’>”);
client.println(“</head>\n<body>”);
client.println(“<div class=’container’>”);
client.println(“<div class=’panel panel-default’ margin:15px>”);
client.println(“<div class=’panel-heading’>”);
client.println(“<H2>Fireplace Wifi Temp Sensor</H2>”);
client.println(“<div class=’panel-body’ style=’background-color: powderblue’>”);
client.println(“<pre>”);
client.print(“Temperature (°F) : “);
client.println(temp, 2);
client.println(“</pre>”);
client.println(“</div>”);
client.println(“</div>”);
client.println(“</div>”);
client.print(“</body>\n</html>”);
}

int AnalogRead() {
int val = 0;
for(int i = 0; i < 20; i++) {
val += analogRead(A0);
delay(1);
}
val = val / 20;
return val;
}

double Thermister(int val) {
double V_NTC = (double)val / 1024;
double R_NTC = (Rs * V_NTC) / (Vcc – V_NTC);
R_NTC = log(R_NTC);
double Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * R_NTC * R_NTC ))* R_NTC );
//Temp = Temp – 273.15;
Temp = Temp – 303.01;
Temp=(Temp*9.0)/5.0+32;
return Temp;
if (Temp<80){
digitalWrite(led,HIGH);
}else{
digitalWrite (led,LOW);
}
Serial.print (Temp);
}

de here

Question Tags: WeMos D1

18 Answers