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Reading a Temperature Sensor — SIK Circuit 7
Ed

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Ed

17. སྤྱི་ཟླ་གསུམ་པ 2026FI
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Reading a Temperature Sensor — SIK Circuit 7

Read temperature from a TMP36 sensor and display Celsius and Fahrenheit readings on the Serial Monitor. Your introduction to serial communication and real-world data.

ལམ་སྟོན

1

Parts & Introduction

The TMP36 is an analog temperature sensor that outputs a voltage proportional to temperature. You'll learn to use the Serial Monitor to display real-time readings — an essential debugging tool.

Parts Needed

  • 1x Arduino Uno + USB cable
  • 1x Breadboard
  • 1x TMP36 Temperature Sensor
  • 5x Jumper Wires

Warning: The TMP36 looks similar to the transistor. Look for "TMP" in tiny letters and a triangle logo. The transistor has "222" printed on it. Inserting the wrong component can damage it!

གོམ་པ་འདིའི་རྫས་རིགས:

SparkFun Inventors Kit - V3.2SparkFun Inventors Kit - V3.21 kit
Arduino Uno R3Arduino Uno R31 piece
BreadboardBreadboard1 piece
TMP36 Temperature SensorTMP36 Temperature Sensor1 piece
Jumper WiresJumper Wires3 pieces

ལག་ཆས་དགོས་མཁོ:

Computer with Arduino IDE
2

Hardware Hookup

Wiring Instructions

With the TMP36 flat side facing you and pins pointing down, the pins are (left to right): 5V, Signal, GND.

  1. Connect the left pin to 5V.
  2. Connect the middle pin (signal) to Analog Pin A0.
  3. Connect the right pin to GND.

That's it — just 3 wires! The TMP36 can only be connected in one direction. Double-check before powering on.

གོམ་པ་འདིའི་རྫས་རིགས:

TMP36 Temperature SensorTMP36 Temperature Sensor1 piece
BreadboardBreadboard1 piece
Jumper WiresJumper Wires3 pieces
3

Arduino Code

Open the Arduino IDE and upload the following sketch to your Arduino board.

temperature_sensor.inoarduino
/*
SparkFun Inventor's Kit
Example sketch 07 — TEMPERATURE SENSOR

Use the serial monitor to read temperature from a TMP36 sensor.

Hardware connections:
  TMP36 (flat side, pins down, left to right): 5V, SIGNAL, GND
  Connect 5V pin to 5V, SIGNAL pin to analog pin 0, GND pin to GND.

This code is completely free for any use.
*/

const int temperaturePin = 0;

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

void loop()
{
  float voltage, degreesC, degreesF;

  voltage = getVoltage(temperaturePin);

  degreesC = (voltage - 0.5) * 100.0;
  degreesF = degreesC * (9.0/5.0) + 32.0;

  Serial.print("voltage: ");
  Serial.print(voltage);
  Serial.print("  deg C: ");
  Serial.print(degreesC);
  Serial.print("  deg F: ");
  Serial.println(degreesF);

  delay(1000);
}

float getVoltage(int pin)
{
  return (analogRead(pin) * 0.004882814);
  // Converts 0-1023 to 0.0-5.0 volts
}

གོམ་པ་འདིའི་རྫས་རིགས:

Arduino Uno R3Arduino Uno R31 piece

ལག་ཆས་དགོས་མཁོ:

Computer with Arduino IDE
4

Test & Experiment

What You Should See

Open the Serial Monitor (magnifying glass icon in Arduino IDE, or Ctrl+Shift+M). You'll see lines updating once per second:

voltage: 0.73  deg C: 23.24  deg F: 73.84

Troubleshooting

  • Nothing happens: Open the Serial Monitor! The output goes there, not to the LEDs.
  • Gibberish text: Set the Serial Monitor baud rate dropdown to 9600.
  • Temperature unchanged: Pinch the sensor with your fingers to warm it up, or apply ice to cool it down.

Experiments to Try

  • Add an LED that turns on above a temperature threshold (like a heat warning).
  • Log data over time to see temperature trends.
  • Combine with the LCD (Circuit 15) to display temperature without a computer.

རྫས་རིགས

5

ལག་ཆས་དགོས་མཁོ

1
  • 13
    Computer with Arduino IDE
ཚོད་དཔག་བསྡོམས
$130.00

You can swap these in

Can't get one of the materials? Swap it for an equivalent — these work just as well.

Recommended for this build

Products makers often use with builds like this one.

Diode KitUsed together and in similar builds
BC547 NPN Transistor (50-Pack)Used together and in similar builds
Resistor 330 Ohm 1/6 Watt PTH - 20 packUsed together and in similar builds
Servo MotorUsed together and in similar builds
5mm LED Assortment Kit (300pcs, 5 Colors)Used together and in similar builds
DC MotorUsed in similar builds
Relay ModuleUsed in similar builds
Resistor 10K Ohm 1/6th Watt PTH - 20 packUsed together and in similar builds

Related blueprints

Other builds that share materials, tools, or techniques with this one.

Using a Flex Sensor — SIK Circuit 9electronics/electromech1 shared material
Driving a Servo Motor — SIK Circuit 8electronics/electromech1 shared material
Driving a Motor — SIK Circuit 12electronics/electromech1 shared material
Using Relays — SIK Circuit 13electronics/electromech1 shared material
Flex Sensor Glove — Control 5 Servo Motors with Hand Gestureselectronics/electromech1 shared material
Reading a Photoresistor — SIK Circuit 6electronics/passive1 shared material

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