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Reading a Temperature Sensor — SIK Circuit 7

작성자

17. 3월 2026

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.

안내

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!

이 단계의 재료:

SparkFun Inventors Kit - V3.21 키트

Arduino Uno R31 개

Breadboard1 개

TMP36 Temperature Sensor1 개

Jumper Wires3 개

필요한 도구:

Computer with Arduino IDE

Hardware Hookup

Wiring Instructions

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

Connect the left pin to 5V.
Connect the middle pin (signal) to Analog Pin A0.
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.

이 단계의 재료:

TMP36 Temperature Sensor1 개

Breadboard1 개

Jumper Wires3 개

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
}

이 단계의 재료:

Arduino Uno R31 개

필요한 도구:

Computer with Arduino IDE

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.