Arduino temperature sensor

Arduino temperature sensor
Arduino temperature sensor

You’ve probably heard of Arduinos and wondered if you could use one to measure temperature. New to Arduinos and sensors? Where do you start? No worries! With a few inexpensive parts, a rudimentary circuit understanding, and a desire to learn, you can sense temperatures quickly. I’ll demonstrate a simple Arduino temperature sensor setup in this post. Connect the sensor, load code, and view readings. I’ll also explain how it works and help you advance your idea. Bring your beginner’s mindset—no experience needed. A simple construction can help you learn Arduino and create more complex projects. Jump in!

Arduino temperature sensing introduction

Arduino temperature sensing requires a few basic components. An Arduino, a temperature sensor, and a breadboard for prototyping are the primary components. The breadboard connects everything, the Arduino board is the brain, and the temperature sensor measures temperature.

Selection of Temperature Sensor

Arduino supports numerous temperature sensors. Beginners usually choose the DHT11 or DS18B20. The DHT11 is cheap but inaccurate, while the DS18B20 is more expensive yet precise. DHT11 works well for most basic projects. It measures 0–50°C with 2°C accuracy and is straightforward to set up. For heavier duty, the DS18B20 is waterproof and measures -55 to 125°C with 0.5°C accuracy.

Sensor Connection

Connect your sensor to your Arduino board. The sensor is connected to Arduino power, ground, and a digital pin via jumper wires. The sensor you choose determines the connections. Connect +5V to the DHT11’s power pin, GND to ground, and pin 2 to data. For the DS18B20, connect +3.3V to red, GND to black, and any digital pin to yellow.

Making Temperature Records

The final step is adding code to your Arduino sketch to read the sensor temperature and print it to the serial monitor. Use Adafruit’s DHT sensor library for DHT11. The DS18B20 has a built-in OneWire library. The sensor you pick will affect the code, but both will give you Celsius temperature data that you can show on an LCD or utilize in Arduino projects! Simple components and coding will get you measuring temperature using Arduino in no time. Have more questions? Let me know!

Selecting an Arduino Temperature Sensor

Nice that your Arduino project requires temperature sensing! But with so many temperature sensor possibilities, how do you pick? Here are some suggestions to help you choose.


Thermistors are cheap, simple, and accurate. They are either NTC (negative temperature coefficient) or PTC (positive temperature coefficient) thermistors. Arduino projects typically use NTC thermistors. Creating a voltage divider circuit requires an external resistor.

RTDs detect resistant temperatures.

Resistance changes linearly with temperature in RTDs, like thermistors. They are accurate but more expensive than thermistors. The PT100 and other platinum and nickel RTDs are the most frequent. Arduino connections require an external resistor.


As temperature varies, thermocouples produce a minor junction voltage variation. They measure several temperatures and are cheap and sturdy. Trade-off: reduced precision. The most popular Arduino kinds are K and T. They need an amplifier circuit to convert voltage to an Arduino-readable signal.

Integrated Digisensors

These integrated sensors have an Arduino-compatible digital interface and on-board analog-to-digital conversion. Popular models include DHT11, DHT22, and DS18B20. They’re easy to put up but fixed range and inaccurate. You can use them for small projects or when precision isn’t important.

Finally, consider accuracy, temperature range, and budget. Beginners should start with integrated digital sensors or thermistors for ease of usage. Learn programming and circuit building basics before dealing with more complicated components. Your next Arduino temperature-sensing project can be upgraded!

Arduino Temperature Sensor Wiring

Connect your temperature sensor to Arduino to use it. This entails connecting power, ground, data, and any other sensor-specific pins.

GND/5V power

First, connect your sensor’s power and ground pins to Arduino’s 5V and GND pins. Powering your sensor allows it to read.

Data Pin

Next, connect your sensor’s data pin to Arduino’s analog input pin A0. This is where the Arduino receives sensor temperature measurements. The data pin on your sensor may be labeled “out”, “data”, or “signal”.

Additional Pins?

Enable and interrupt pins are needed for some sensors. Check your sensor’s datasheet for additional pins to connect to Arduino digital pins.

Verify Connections

After connecting everything, verify that your sensor’s 5V, GND, and data pins match your Arduino’s. Also verify any additional pin wiring. Check all cables before connecting pins to avoid damaging your sensor or Arduino.

Try Your Sensor

To test your temperature sensor, submit a simple Arduino sketch with all pins attached. Test by reading the analog value of your sensor’s data pin and printing it to the serial monitor. The serial monitor should show temperature updates if your sensor is working!

Recheck all connections if your sensor doesn’t work. Please check your sensor’s datasheet to confirm your code is reading sensor data appropriately. Troubleshooting will get your Arduino temperature sensor working quickly!

Reading Temperature Data into Arduino Sketch

Communication between your sensor and Arduino is needed to read temperature data. Use the DallasTemperature library for simplicity.

Installation of Library

Install the DallasTemperature library first. In Arduino IDE, select Sketch -> Include Library -> Manage Libraries. Search for “DallasTemperature” and install Bill Greiman’s library. The Arduino can interface with the DS18B20 sensor using this library.

Declaring Sensor Pin

Next, define your sensor’s pin in your sketch. As an example:

// Data wire connects to Arduino pin 2 #define ONE_WIRE_BUS 2

Set up a OneWire instance to talk to devices.

// Send Dallas Temperature our oneWire reference.
DallasOneWire temperature sensors;

It specifies a sensor on pin 2, sets up OneWire communication, and passes it to the DallasTemperature library.

Sensor Initialization

Call sensors in setup().begin() to start sensor communication:

void setup() { sensors.start();

Reading Temperature

In your main loop, call sensors.Request sensor temperature using requestTemperatures(). Then call sensors.getTempCByIndex(0) for the initial sensor’s Celsius temperature:

void loop() { sensors.requestTemperatures(); float tempC = sensors.getTempCByIndex(0); }

Use your DS18B20 sensor’s current temperature in your sketch! Display it on an LCD, graph it, or send it serially to your computer. Endless possibilities. Have more questions? Let me know!

Making a Simple Arduino Temperature Monitor

After getting your Arduino Uno and DHT11 temperature sensor, develop your temperature monitoring project. This Arduino-based sensor system teaches environmental data reading for beginners.

Connecting DHT11 Sensor

Power, ground, data, and a non-connected pin make up the DHT11. Connect the Arduino’s power pin to 5V, ground pin to any GND, and data pin to digital pin 7.

Installing DHT Sensor Library

Install the DHT sensor library to connect the Arduino to the DHT11. In Arduino IDE, select Sketch > Include Library > Manage Libraries. Find the latest “DHT sensor library” and install it.

Writing the Sketch

Write code to read temperature data after installing the library. Include the library in a new sketch: Include <DHT.h>

Then define your DHT sensor pin and type: DHTTYPE DHT11 // DHT 11 #define DHTPIN 7 // DHT sensor pin

Initialize the sensor in setup(): DHT(DHTPIN, DHTTYPE);

Read sensor temperature and humidity in loop(): float t = dht.readTemperature() # Celsius temperature = dht.readHumidity(); // get humidity as %

Print the values to the Serial Monitor to see the readings! Upload the sketch to Arduino and open Serial Monitor. Temperature and humidity should update every second.

Congratulations on your Arduino temperature monitoring project! Now you may log data to an SD card, display it on an LCD screen, or transfer it to a web server. Arduino and environmental sensing have unlimited applications.


It turns out Arduino temperature sensing isn’t hard. Temperature variations can be detected using a few simple components. Choosing the suitable sensor and attaching it to the Arduino is crucial. Remember to install the necessary libraries. After learning the basics, you can explore and construct more complicated temperature monitors and controllers. Arduino’s power opens up unlimited options! Apply what you’ve learned here and you’ll be ready for more difficult projects soon. Explore Arduino and make something fantastic now!

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