Question

ESP8266/Arduino UNO and temperature sensor MCP9700A.

Temperature sensor gives incorrect temperature readings in celsius.

Both ESP8266 and UNO uses 3.3v pin.

Codes:

float temp;

void setup() {

Serial.begin(57600);

};

void loop () {

temp = analogRead(0)*3.3/1024.0;

temp = temp - 0.5;

temp = temp / 0.01;

Serial.println(temp);

delay(500);

};

Answer 1

Here is the code , that actually works

float temp;
int tempPin = 0;

void setup() {
Serial.begin(9600);
}

void loop() {
temp = analogRead(tempPin);
// read analog volt from sensor and save to variable temp
temp = temp * 0.48828125;
// convert the analog volt to its temperature equivalent
Serial.print("TEMPERATURE IS = ");
Serial.print(temp); // display temperature value
Serial.print("*C");
Serial.println();
delay(1000); // update sensor reading each one second
}