Active Sensor Thermometer

How to build a simple and accurate thermometer using an active temperature sensor (MCP9071/A).

Apr 25, 2017

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home automation

thermometer

active sensor

Devices & Components

Arduino Mega 2560 Rev3

MCP9071/A

Project description

Code

Arduino code for thermometer active sensor based

arduino

taking the application scheme as referencehow to connect the sensor to the Arduino board and loading this code in the arduino, it is possibile read the room temperature in the serial output interface. Every 1s the measure is done and printed

1/*
2
3   The value of Vout is obtained by averaging 1024 values reading  the voltage on pin A0. whicch is connected to the sensor output. The value of temeprature  ta, read by the sensor is shown on the serial monitor.
4
5*/
6
7
8// set  pin numbers:
9
10const int in = A0;            // input for reading the sensor  output
11
12// set constants:
13const float vout0 = 400;   //  sensor output  voltage in mV at 0°C
14const float tc = 19.53;   // mV for °C temperature constant  for the  MCP9701/A
15
16// variables:
17
18int i, f;
19float vout, vout_avg,  ta;
20
21
22// MAIN PROGRAM
23
24void setup() {
25  Serial.begin(9600);
26  pinMode(in, INPUT);            // set pin in as input
27  pinMode(13, OUTPUT);            // set pin 13 as output
28  digitalWrite(13, LOW);
29  analogReference(DEFAULT);
30  
31}
32
33void loop() {
34  vout_avg = 0;
35  for (i = 0; i < 1024; i++) {
36    vout = analogRead(A0) * (4976.30 / 1023);
37    //Serial.println(vout);
38    vout_avg = vout_avg + vout;
39  }
40  vout = vout_avg / 1024;
41  //Serial.println(vout);
42  ta = (vout - vout0) / tc;
43  Serial.print("temperature ( celcius degree)   =  " );
44  Serial.println(ta);
45  delay (1000);
46}

/*

   The value of Vout is obtained by averaging 1024 values reading  the voltage on pin A0. whicch is connected to the sensor output. The value of temeprature  ta, read by the sensor is shown on the serial monitor.

*/


// set  pin numbers:

const int in = A0;            // input for reading the sensor  output

// set constants:
const float vout0 = 400;   //  sensor output  voltage in mV at 0°C
const float tc = 19.53;   // mV for °C temperature constant  for the  MCP9701/A

// variables:

int i, f;
float vout, vout_avg,  ta;


// MAIN PROGRAM

void setup() {
  Serial.begin(9600);
  pinMode(in, INPUT);            // set pin in as input
  pinMode(13, OUTPUT);            // set pin 13 as output
  digitalWrite(13, LOW);
  analogReference(DEFAULT);
  
}

void loop() {
  vout_avg = 0;
  for (i = 0; i < 1024; i++) {
    vout = analogRead(A0) * (4976.30 / 1023);
    //Serial.println(vout);
    vout_avg = vout_avg + vout;
  }
  vout = vout_avg / 1024;
  //Serial.println(vout);
  ta = (vout - vout0) / tc;
  Serial.print("temperature ( celcius degree)   =  " );
  Serial.println(ta);
  delay (1000);
}

Arduino code for thermometer active sensor based

arduino

1/*
2
3   The value of Vout is obtained by averaging 1024 values reading   the voltage on pin A0. whicch is connected to the sensor output. The value of temeprature   ta, read by the sensor is shown on the serial monitor.
4
5*/
6
7
8// set   pin numbers:
9
10const int in = A0;            // input for reading the sensor   output
11
12// set constants:
13const float vout0 = 400;   //  sensor output   voltage in mV at 0°C
14const float tc = 19.53;   // mV for °C temperature constant   for the  MCP9701/A
15
16// variables:
17
18int i, f;
19float vout, vout_avg,   ta;
20
21
22// MAIN PROGRAM
23
24void setup() {
25  Serial.begin(9600);
26   pinMode(in, INPUT);            // set pin in as input
27  pinMode(13, OUTPUT);             // set pin 13 as output
28  digitalWrite(13, LOW);
29  analogReference(DEFAULT);
30   
31}
32
33void loop() {
34  vout_avg = 0;
35  for (i = 0; i < 1024; i++) {
36     vout = analogRead(A0) * (4976.30 / 1023);
37    //Serial.println(vout);
38     vout_avg = vout_avg + vout;
39  }
40  vout = vout_avg / 1024;
41  //Serial.println(vout);
42   ta = (vout - vout0) / tc;
43  Serial.print("temperature ( celcius degree)   =   " );
44  Serial.println(ta);
45  delay (1000);
46}

/*

   The value of Vout is obtained by averaging 1024 values reading   the voltage on pin A0. whicch is connected to the sensor output. The value of temeprature   ta, read by the sensor is shown on the serial monitor.

*/


// set   pin numbers:

const int in = A0;            // input for reading the sensor   output

// set constants:
const float vout0 = 400;   //  sensor output   voltage in mV at 0°C
const float tc = 19.53;   // mV for °C temperature constant   for the  MCP9701/A

// variables:

int i, f;
float vout, vout_avg,   ta;


// MAIN PROGRAM

void setup() {
  Serial.begin(9600);
   pinMode(in, INPUT);            // set pin in as input
  pinMode(13, OUTPUT);             // set pin 13 as output
  digitalWrite(13, LOW);
  analogReference(DEFAULT);
   
}

void loop() {
  vout_avg = 0;
  for (i = 0; i < 1024; i++) {
     vout = analogRead(A0) * (4976.30 / 1023);
    //Serial.println(vout);
     vout_avg = vout_avg + vout;
  }
  vout = vout_avg / 1024;
  //Serial.println(vout);
   ta = (vout - vout0) / tc;
  Serial.print("temperature ( celcius degree)   =   " );
  Serial.println(ta);
  delay (1000);
}

Downloadable files

SCHEMATIC

The hardware implementation is executed by using the Arduino MEGA 2560 card: just connect the active sensor as shown in the figure. Pin A0 is set as an analog input for converting the output voltage of the sensor to the AD.

SCHEMATIC

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