The Arduino reads temperature from a MCP9700 temperature sensor IC and displays the temperature in the Arduino IDE serial monitor window.
Also see the Arduino LCD thermometer tutorial (tutorial 14).
Prerequisites
Complete Tutorial 9: Using the Arduino Serial Port before attempting this tutorial.
Components
Besides an Arduino Uno board, USB cable, wire links and a breadboard, you will need:
| QTY | PART | DESIGNATOR | NOTES | TYPE |
|---|---|---|---|---|
| 2 | 100n | C1, C2 | Non-polarized | Capacitor |
| 1 | MCP9700 | U1 | Linear Active Thermistor IC | Semiconductor |
Circuit Diagram
The schematic for the Arduino serial thermometer and pinout for the MCP9700 is shown below. The MCP9700 temperature sensor is packaged in a TO-92 case – it looks like a transistor.
Building the Circuit
The circuit is very simple to build, click the picture below for a bigger image of the breadboard circuit..
Programming the Arduino
The serial_temperature sketch is listed below. Copy the sketch and paste it into the Arduino IDE.
/*--------------------------------------------------------------
Program: serial_temperature
Description: Reads the voltage from a MCP9700 temperature
sensor on pin A0 of the Arduino. Converts the
voltage to a temperature and sends it out of
the serial port for display on the serial
monitor.
Date: 15 April 2012
Author: W.A. Smith, http://startingelectronics.com
--------------------------------------------------------------*/
void setup() {
// initialize the serial port
Serial.begin(9600);
}
Read more: Arduino Serial Thermometer