Manual Fan Control Temperature System with Arduino Uno WiFi

This project shows you how to build a temperature alert system that will allow you to manually trigger a fan to turn on or off from hyper links.

NOTE:

This project can be a bit “quirky” as written. Auto refresh does not work well on Google Chrome. This should be taken purely as a learning experiment, and not something to be copy/pasted to a real environment.

Functional Parts in the Project:

Arduino WiFi Rev 2 – https://store.arduino.cc/usa/arduino-uno-wifi-rev2
L298N Motor Module – https://amzn.to/2Xa9uiR
200mm 12v Fan – https://amzn.to/2X40nQt
Analog Temperature Sensor – https://amzn.to/2Rkkl3k
Breadboard Kit – https://amzn.to/2Xih5ei
560 Piece Jumper Wire Kit – https://amzn.to/2MsCLjL
DC 2.1mm Power Adapter – https://amzn.to/2xzn5kk
12V 2A Power Supply – https://amzn.to/2Xv3GM0

#include <SPI.h>
#include <WiFiNINA.h>

#define tempSensor A5

#define enA 8
#define in1 9
#define in2 10

char ssid[] = "test";
char pass[] = "";
int keyIndex = 0;

int status = WL_IDLE_STATUS;
WiFiServer server(80);

String readString;

int highTemp = 82;
int goodTemp = 76;

void setup() {
  pinMode(enA, OUTPUT);
  pinMode(in1, OUTPUT);
  pinMode(in2, OUTPUT);

  analogWrite(enA, 255);

  Serial.begin(9600);

  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to Network named: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, pass);
    delay(10000);
  }
  server.begin();

  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
}

void loop() {

  int reading = analogRead(tempSensor);
  float voltage = reading * 5;
  voltage /= 1024.0;
  float temperatureC = (voltage - 0.5) * 100 ;
  float temperatureF = (temperatureC * 9.0 / 5.0) + 32.0;

  WiFiClient client = server.available();
  if (client) {
    Serial.println("new client");

    while (client.connected())
    {
      if (client.available())
      {
        char c = client.read();
        if (readString.length() < 100)
        {
          readString += c;
          Serial.write(c);

          if (c == '\n') {

            client.println("<head><meta http-equiv=\"refresh\" content=\"5\"></head>");

            if (temperatureF >= highTemp) {

              client.print("<h1 style=\"color:red; font-size:400px; margin-bottom: 10px;\">");
              client.print(temperatureF);
              client.println("</h1>");

              client.println("<a href=\"/?fanon\"\">Turn On Fan</a>");
              client.println("<br />");
              client.println("<br />");
              client.println("<a href=\"/?fanoff\"\">Turn Off Fan</a><br />");

            }
            else if (temperatureF < highTemp && temperatureF >= goodTemp) {
              client.print("<h1 style=\"color:yellow; font-size:400px; margin-bottom: 10px;\">");
              client.print(temperatureF);
              client.println("</h1>");

              client.println("<a href=\"/?fanon\"\">Turn On Fan</a>");
              client.println("<br />");
              client.println("<br />");
              client.println("<a href=\"/?fanoff\"\">Turn Off Fan</a><br />");

            }
            else {
              client.print("<h1 style=\"color:green; font-size:400px; margin-bottom: 10px;\">");
              client.print(temperatureF);
              client.println("</h1>");

              client.println("<a href=\"/?fanon\"\">Turn On Fan</a>");
              client.println("<br />");
              client.println("<br />");
              client.println("<a href=\"/?fanoff\"\">Turn Off Fan</a><br />");

            }

            delay(1);

            if (readString.indexOf("?fanon") > 0)
            {
              digitalWrite(in1, HIGH);
              digitalWrite(in2, LOW);

              delay(1);
            }
            else {
              if (readString.indexOf("?fanoff") > 0)
              {
                digitalWrite(in1, LOW);
                digitalWrite(in2, LOW);

                delay(1);
              }
            }

            readString = "";

            delay(1);
            client.stop();
            Serial.println("client disonnected");
          }
        }
      }
    }
  }
}