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These sensors work in a similar way, but are calibrated differently to output a voltage proportional to the different temperature units. The LM35 outputs 10 mV per degrees Celsius rise in temperature. In a similar way, the LM outputs 10 mV per degrees Kelvin rise in temperature and the LM34 outputs 10 mV per degrees Fahrenheit rise in temperature. For example, if the LM35 outputs a voltage of mV, that means we have a temperature value of The adj pin can be used to calibrate the sensor and obtain more accurate temperature readings.
The following code reads the temperature from the LM35 sensor and displays the readings in the Serial Monitor. This code is also compatible with LM and LM34 — you just need to uncomment some lines in the code to use the right sensor.
View raw code. You start by defining the pin that is connected to the sensor output. It must be an analog pin. The voltageOut variable will store the actual voltage output value coming from the sensor.
Then, create variables that will store the temperature value. Here, we create a temperatureC and a temperatureF variables to hold the temperature in Celsius and Fahrenheit, respectively. In the setup , declare the sensorPin as an input:. Initialize a serial communication at a baud rate of You need to initialize the serial communication so that you can display the readings on the Serial Monitor:.
In the loop , read the value coming from you sensor and save it in voltageOut variable. To read an analog value with Arduino you just need to use analogRead function and pass the pin you want to read as an argument. As mentioned previously, these sensors output a voltage value that is proportional to the temperature. The analog values read from the Arduino may have a value between 0 and , in which 0 corresponds to 0V and to 5V.
So, we can easily get the output voltage of the sensor in mV. So, the temperature in Celsius corresponds to the voltage read from the sensor in mV divided by 10mV. You just need to keep in mind that the LM returns the temperature in Kelvin degrees and the LM34 in Fahrenheit degrees. Then, you can convert the values to other units if needed. Finally, print the sensors readings to the Serial Monitor both in Celsius and Fahrenheit degrees. Upload the code to your Arduino IDE. After that, open the Serial Monitor at a baud rate of You should get new temperature readings every second.
You can cover the sensor with your finger to see the temperature values increasing. You can use the preceding links or go directly to MakerAdvisor. Follow the next instructions to install those libraries. The Library Manager should open. After wiring the circuit and installing the required libraries, upload the following code to your Arduino board. Now, you can check the sensor readings in the OLED display. New temperature readings are displayed every second.
They can be powered by the Arduino 5V pin, and to read the voltage, you use an analog pin. Reading the voltage from the sensor is as easy as using the analogRead function on the sensor pin. Then, you just need to make a simple calculation to get the temperature in your desired unit. We have other guides about Arduino sensors and modules that you may like:.
Much appreciated! I am still waiting on the LM35DZ amongst other items This can be a real show stopper as some shipments get lost and or take as long as 90 days to arrive. Hi Chris. Sometimes parts from China take a long time to get to its destination. But, they are also very cheap. So, we have to wait. Regards, Sara. Great Tutorial! Thanks a lot. And change the value on Notify me of follow-up comments by email. Notify me of new posts by email.
Recommended Resources. What to Read Next…. ESP Weather Forecaster. Enjoyed this project? Stay updated by subscribing our weekly newsletter! Regards, Sara Reply. Download our Free eBooks and Resources.
Precision Centigrade Temperature Sensor LM35DZ Waterproof
Description The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. Lower cost is assured by trimming and calibration at the wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device makes interfacing to readout or control circuitry especially easy.
LM35C Sensors. Datasheet pdf. Equivalent
The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. Lower cost is assured by trimming and calibration at the wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device makes interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the …. PDF , 1.
Guide for LM35, LM335 and LM34 Temperature Sensors with Arduino
Datasheet Texas Instruments LM35DZ/LFT1