This project displays the temperature on a web page that auto refreshes. The color of the temperature readout changes based on the temperature.
Functional Parts in the Project:
- Arduino WiFi Rev 2 – https://store.arduino.cc/usa/arduino-uno-wifi-rev2
- Analog Temperature Sensor – https://amzn.to/2Rkkl3k
- Breadboard Kit – https://amzn.to/2Xih5ei
- 560 Piece Jumper Wire Kit – https://amzn.to/2MsCLjL


#include <SPI.h>
#include <WiFiNINA.h>
#define sensorPin A0
char ssid[] = "test";
char pass[] = "";
int keyIndex = 0;
int status = WL_IDLE_STATUS;
WiFiServer server(80);
int highTemp = 82;
int goodTemp = 76;
void setup() {
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(sensorPin);
float voltage = reading * 5.0;
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");
String currentLine = "";
while (client.connected()) {
if (client.available()) {
char c = client.read();
Serial.write(c);
if (c == '\n') {
if (currentLine.length() == 0) {
client.println("<head><meta http-equiv=\"refresh\" content=\"5\"></head>");
if (temperatureF >= highTemp){
client.print("<h1 style=\"color:red; font-size:400px\">");
client.print(temperatureF);
client.println("</h1>");
}
else if(temperatureF < highTemp && temperatureF >= goodTemp){
client.print("<h1 style=\"color:yellow; font-size:400px\">");
client.print(temperatureF);
client.println("</h1>");
}
else {
client.print("<h1 style=\"color:green; font-size:400px\">");
client.print(temperatureF);
client.println("</h1>");
}
break;
}else {
currentLine = "";
}
} else if (c != '\r') {
currentLine += c;
}
}
}
client.stop();
Serial.println("client disconnected");
}
}
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