Arduino temperature sensor

Arduino temperature sensor
Arduino temperature sensor

Have you ever wished to monitor your home or business temperature with a bespoke sensor? Arduino makes it easier than you think! This tutorial will show you how to quickly create an Arduino-based temperature sensor. We’ll cover the parts, circuit assembly, code upload, and temperature data collection. Arduino newbies will love this project. In basic language, I’ll explain everything. Your Arduino temperature sensor will work by the end. Let’s construct!

Introduction to Arduino Temperature Sensors

An Arduino temperature sensor only a few basic components. Popular microcontroller boards like the Arduino Uno can read sensor data and act on it. Use a DHT11 or DHT22 digital temperature sensor to measure temperature. These are cheap, accurate, and simple to set up.

Connecting the Sensor

The DHT sensor has power, ground, and data pins. The power pin should be connected to Arduino 5V, the ground pin to ground, and the data pin to digital pin 2. The Arduino receives digital temperature and humidity data from the DHT.

Programming the Arduino

To read sensor data, install the DHT sensor library. In Arduino IDE, select Sketch > Include Library > Manage Libraries. Install “DHT sensor library” from search. Include it at the top of your code:

Include “DHT.h”

Next, specify your pin and sensor type:

Define DHTPIN 2 and DHTTYPE DHT11 to link the DHT sensor to the pin.


Start serial communication and DHT sensor initialization in setup:

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

Finally, read the DHT sensor’s temperature and humidity and print them to the Serial Monitor in the loop function:

float t = dht.readTemperature(); float h = dht.readHumidity();
Print(“Temperature: “);
Serial.print(t); Serial.print(“°C “); Serial.print(“Humidity: “); Serial.print(h); Serial.println(” %”);

Upload this code to Arduino and open Serial Monitor to see temperature and humidity. Congratulations on your Arduino temperature sensor! Any questions? Let me know.

Parts Needed to Build an Arduino Temperature Sensor

A basic Arduino temperature sensor just a few components. Here’s all you’ll need for this fun DIY project.

Arduino Uno Board

An Arduino Uno powers this project. This popular microcontroller board controls electronics and reads sensors. Simple programming makes it ideal for beginners.


Connect components to a breadboard to test your circuit before soldering. Internal rows of holes allow component assembly without wire.

Jumper wires

Connecting breadboard components to the Arduino board requires male-to-male jumper wires. To color-code your connections, these flexible wires come in various colors.

LM35 temperature sensor

Analog temperature sensors like the LM35 produce voltage proportional to temperature. It measures -55°C to 150°C. VCC, GND, and Output are this sensor’s pins.

10K Ohm resistor

Connecting the LM35 to the Arduino requires a 10K Ohm resistor. This connects the LM35’s output voltage to the Arduino’s reference voltage for precise temperature readings.

LCD display (optional)

Connect an LCD display to show temperature. A basic 16×2 LCD display will do for this project. It displays data in 16 columns and 2 rows.

Get everything you need to construct a DIY Arduino temperature sensor with these parts. Start breadboarding your circuit, programming the Arduino, and displaying temperature information on the LCD. Have fun and luck!

Wiring the Temperature Sensor Circuit

The temperature sensor circuit requires a few simple components:

TMP36 temperature sensor

A voltage corresponding to ambient temperature is output by this sensor. The range is -50°C to 125°C with ±1°C precision.

Arduino Uno

Arduino is the circuit’s brain. The sensor is powered and the analog voltage signal is converted to digital temperature.

Jumper wires are required to connect the temperature sensor to the Arduino.

Breadboard (optional)

Without soldering, a breadboard lets you prototype the circuit. Connect components and cables by plugging them in.

Resistor (optional)

A 10KΩ pull-down resistor is recommended for precise temperature readings. It stabilizes sensor voltage.

GND pin

Connect the temperature sensor GND pin to any Arduino GND pin. A ground reference for the voltage signal.

VCC pin
The sensor’s VCC pin must connect to the Arduino’s 5V pin to power it.

Analog pin
Any Arduino analog input pin, A0 to A5, receives the temperature sensor’s analog voltage signal. This example uses A0.

You must upload code to the Arduino to read the sensor’s analog signal and convert it to temperature. The code calculates temperature from voltage using the sensor’s datasheet formula.

After wiring the temperature sensor, the Arduino can measure your environment’s temperature! Monitor sensor readings in the Arduino IDE serial monitor and modify code or circuit as appropriate.

To read temperature data from the DHT11 sensor, code the Arduino. Using a DHT sensor library simplifies sensor interaction.

Import DHT Sensor Library.

Install the DHT sensor library first. In Arduino IDE, select Sketch > Include Library > Manage Libraries. Adafruit’s DHT sensor library can be found and installed.

Determine Pin and Sensor Type

Define the DHT11 data pin and sensor type at the top of your code:

Define DHTPIN 2 and DHTTYPE DHT11 to link the DHT sensor to the pin.

Make DHT Object
Pass the pin and sensor type to construct a DHT object. This simplifies sensor reading in the code.


Start Serial Monitor

Initialize the serial monitor in setup() to view temperature readings.

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

Loop temperature read

Read the DHT sensor temperature and print it to the serial monitor in loop(). Wait 2 seconds between readings.

void loop() { float t = dht; // Read temperature as Celsius (default).readTemperature();

// Read temperature in Fahrenheit (isFahrenheit = true)
float f=dht.readTemperature(true);

// If readings fail, quit early to try again.
If (isnan(t) || isnan(f)) { Serial.println(“Failed to read from DHT sensor!”); return; }

Print temperatures.
Serial.print(“Temperature: “); t; “°C / “; f; “°F”;

Between measurements, wait a few seconds.
Delay (2000);

Upload this code to Arduino and open serial monitor. Temperature readings should appear every 2 seconds!

Testing and Fixing Arduino Temperature Sensor
After building your temperature sensor, test it! Connect your Arduino board to your computer and launch Arduino IDE. Upload your temperature sensor reading code.

Check Serial serial monitor.

First, verify that the Arduino is reading the temperature sensor. Open Arduino IDE’s Serial Monitor window. This shows temperature sensor data in raw format. Temperature readings should scroll continuously. Recheck your wiring to ensure all connections are secure.

Compare Readings

Next, check your Serial Monitor readings against a nearby thermometer. We should see temperatures within a degree or two Celsius. A wide disparity may suggest a temperature sensor problem. The sensor may be too close to a heat source (like your Arduino) affecting readings. You may need to move or shield the sensor.

Differential Temperature Test

Take readings at various temperatures for the most complete test. Put the sensor near a window where it becomes colder at night. Compare daylight and overnight measurements to calibrate the sensor across temperatures. If measurements are incorrect at some temperatures but not others, your sensor may be sensitive.

Tips for Fixing

If your temperature sensor doesn’t read properly after testing, examine these:

• Check wire connections twice. The wiring is often loose or wrong.

•Make sure your Arduino power source provides 5V consistently.

•Rate your temperature sensor for the desired range. Some sensors can’t measure extreme cold or heat.

•Change your temperature sensor. Unfortunately, sensors might arrive damaged or fail early. Sensor replacement is simple.

•Shield the sensor. Nearby heat sources or electrical components can affect temperature readings. Adding a shield can reduce interference.

Testing and troubleshooting can get you accurate temperature readings fast! Any questions? Let me know.


That’s it, folks! With a few parts and some knowledge, you can construct an Arduino temperature sensor quickly. Get an Arduino board, a temperature sensor, jumper wires, and a breadboard, then follow the wiring diagram. Install your custom sensor, upload the code, and read Celsius and Fahrenheit temperatures quickly. You can make cool stuff using basic gear, right? You can now monitor house, garden, and other temperatures. Unlock Arduino’s power for unlimited possibilities. Let your creativity shine and build something great!

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