Arduino LED Temperature Indicator

Give this the parameters you want and the LEDs will light up according to the temperature cold blue, green fine, red hot

Dec 4, 2017

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8 respects

temperature

led

simple

Devices & Components

Arduino Uno Rev3

LED (generic)

Jumper wires (generic)

Temperature Sensor

Breadboard (generic)

Project description

Code

arduino

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1const int hot = 87; //set hot parameter
2const int cold = 75; //set   cold parameter
3void setup() {
4pinMode(A2, INPUT); //sensor
5pinMode(2, OUTPUT);   //blue
6pinMode(3, OUTPUT); //green
7pinMode(4, OUTPUT); //red
8Serial.begin(9600);
9}
10void   loop() {
11int sensor = analogRead(A2);
12float voltage = (sensor / 1024.0) *   5.0;
13float tempC = (voltage - .5) * 100;
14float tempF = (tempC * 1.8) + 32;
15Serial.print("temp:   ");
16Serial.print(tempF);
17if (tempF < cold) { //cold
18digitalWrite(2, HIGH);
19digitalWrite(3,   LOW);
20digitalWrite(4, LOW);
21Serial.println(" It's Cold.");
22}
23else   if (tempF >= hot) { //hot
24digitalWrite(2, LOW);
25digitalWrite(3, LOW);
26digitalWrite(4,   HIGH);
27Serial.println(" It's Hot.");
28}
29else { //fine
30digitalWrite(2,   LOW);
31digitalWrite(3, HIGH);
32digitalWrite(4, LOW);
33Serial.println(" It's   Fine.");
34}
35delay(10);
36}
37

const int hot = 87; //set hot parameter
const int cold = 75; //set   cold parameter
void setup() {
pinMode(A2, INPUT); //sensor
pinMode(2, OUTPUT);   //blue
pinMode(3, OUTPUT); //green
pinMode(4, OUTPUT); //red
Serial.begin(9600);
}
void   loop() {
int sensor = analogRead(A2);
float voltage = (sensor / 1024.0) *   5.0;
float tempC = (voltage - .5) * 100;
float tempF = (tempC * 1.8) + 32;
Serial.print("temp:   ");
Serial.print(tempF);
if (tempF < cold) { //cold
digitalWrite(2, HIGH);
digitalWrite(3,   LOW);
digitalWrite(4, LOW);
Serial.println(" It's Cold.");
}
else   if (tempF >= hot) { //hot
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4,   HIGH);
Serial.println(" It's Hot.");
}
else { //fine
digitalWrite(2,   LOW);
digitalWrite(3, HIGH);
digitalWrite(4, LOW);
Serial.println(" It's   Fine.");
}
delay(10);
}

Code

arduino

Upload code into Arduino

1const int hot = 87; //set hot parameter
2const int cold = 75; //set  cold parameter
3void setup() {
4pinMode(A2, INPUT); //sensor
5pinMode(2, OUTPUT);  //blue
6pinMode(3, OUTPUT); //green
7pinMode(4, OUTPUT); //red
8Serial.begin(9600);
9}
10void  loop() {
11int sensor = analogRead(A2);
12float voltage = (sensor / 1024.0) *  5.0;
13float tempC = (voltage - .5) * 100;
14float tempF = (tempC * 1.8) + 32;
15Serial.print("temp:  ");
16Serial.print(tempF);
17if (tempF < cold) { //cold
18digitalWrite(2, HIGH);
19digitalWrite(3,  LOW);
20digitalWrite(4, LOW);
21Serial.println(" It's Cold.");
22}
23else  if (tempF >= hot) { //hot
24digitalWrite(2, LOW);
25digitalWrite(3, LOW);
26digitalWrite(4,  HIGH);
27Serial.println(" It's Hot.");
28}
29else { //fine
30digitalWrite(2,  LOW);
31digitalWrite(3, HIGH);
32digitalWrite(4, LOW);
33Serial.println(" It's  Fine.");
34}
35delay(10);
36}
37

const int hot = 87; //set hot parameter
const int cold = 75; //set  cold parameter
void setup() {
pinMode(A2, INPUT); //sensor
pinMode(2, OUTPUT);  //blue
pinMode(3, OUTPUT); //green
pinMode(4, OUTPUT); //red
Serial.begin(9600);
}
void  loop() {
int sensor = analogRead(A2);
float voltage = (sensor / 1024.0) *  5.0;
float tempC = (voltage - .5) * 100;
float tempF = (tempC * 1.8) + 32;
Serial.print("temp:  ");
Serial.print(tempF);
if (tempF < cold) { //cold
digitalWrite(2, HIGH);
digitalWrite(3,  LOW);
digitalWrite(4, LOW);
Serial.println(" It's Cold.");
}
else  if (tempF >= hot) { //hot
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4,  HIGH);
Serial.println(" It's Hot.");
}
else { //fine
digitalWrite(2,  LOW);
digitalWrite(3, HIGH);
digitalWrite(4, LOW);
Serial.println(" It's  Fine.");
}
delay(10);
}

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Wire Drawing

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