arduino thermometer


If you’re doing like a weather station or some kind of like home environmental control, project, they’re, really good, really inexpensive and very easy to set up the thermistor I’m using in this video is a 100 K, own resistance, thermistor we’re, going to set up a voltage divider. So we need to have a resistor that is equal in resistance to the thermistor. So in this case I have a 100 kilo, ohm resistor so I’m, going to take the thermistor and insert it into the breadboard I’m, going to take my 100 kilo ohm resistor and connect one side of the resistor to one side of the thermistor, then I’m, going To take a jumper wire and connect the side of the thermistor that’s not connected to the resistor and insert that into the 5 volt pin of the Arduino now I’m going to take another jumper wire and connect the side of the resistor that’s not connected into the Thermistor and insert that into the ground, pin at the Arduino now I’m going to take another jumper wire and insert that into the breadboard in the same row that the thermistor and the resistor are connected. Then I’m going to connect that to analog, pin a 0 on the Arduino and that’s it as far as connecting the circuit goes so now I can upload a program. I have a blog post for this. Video and I’ll put the link in the description. So you can go there to get the get the code and I go into a little bit more detail about how the thermistor works and what it’s made of how the voltage divider comes into effect.

Here I have a diagram showing how to connect what we just made, but I just might demonstrate it for now so let’s grab this copy that and open up the Arduino IDE paste that in there and click the upload button and once that’s uploaded, we can open Up the serial monitor and the temperature readings will be displayed here so it’s around 76 degrees Fahrenheit, and if I grab the thermistor, it goes up almost immediately, so the response is really good on these. So what if you want to output the readings in Celsius? It’S really easy find this line right here and enter two forward slashes at the beginning of the line to comment it out. This line of the code converts the temperature readings from Celsius to Fahrenheit. So if we comment that out, we’ll get our Celsius readings and we want to change the F to a C about the serial monitor and now the temperatures in Celsius and going back to the circuit so that’s. How good? If you’re fine, with just having the temperature readings output to the serial monitor, but if you want to hook up a LCD display and have them output to the LCD, I have another article: how to set up an LCD display on an Arduino. So you can go check that out. That’Ll show you how to connect up the LCD display to the Arduino I’m, not really going to go in detail here about how to connect it.

I actually have another video too about that, so you can check that out. If you want and we’ll set up our thermistor and resistor voltage, divider here, it’s, exactly the same as before. Just remember that you need to have your resistor be the same resistance value as your thermistor. If you don’t know the resistance value of your thermistor, I have a paragraph in the blog post that will tell you how to find that out. We’Ll copy this code and paste it in there and upload. So you can see the temperature readings displayed on the LCD. An LCD would be good for a weather station or a home environment monitoring project, and they just look cool so alright, well that’s about it be sure to check out the blog post, I’ll link to that in the description and I’ll go into a lot more detail. Plus there’s diagrams and other things there for you that explain it more in depth and if you like it, please like it and share it and don’t forget to subscribe. We’Ve got a lot more videos coming out all right. We’Ll talk to you later have a good day.


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Comment (26)

  1. I almost always use LM35 for temperature tansducer. 10mV/°C, precisely 1.00 volt at 100°C.
    Cheers from Indonesia

  2. I need little expert help.
    My AirConditioner outside has a heat sensor when outside temperature is above 35 C it cools alot below 35C everything is fine as per its compressors working .
    Is there any way i can fix the temperature of sensor no matter how hot outside it gives the inside system temperature of 34C fixed any way possible ?

  3. How can I use the Thermistor to measure the temperature of say some running water?
    Clearly I cant submerge it in watter right…

  4. I recommend to anyone trying this project to use a trimmer instead of a resistor so, that you can adjust the sensitivity of the temperature reading. Also, there are some temperature reading error. I found the solution within the comments, just change some values to c1=0.7904710802e-3, c2=2.251846924e-4, c3=0.87060700625e-7.

  5. Hi, I am beginner in Arduino. You video is very clear and very useful.
    But I just saw the website, I am wondering is the first equation should be R1/(R1 + R2), not R2/(R1+R2).
    Please clarify my concept if I am wrong. Thank You!!!

  6. Would that thermistor thingy survive if applied over a heat sink? i need to keep a metal at a stable temperature and it should be able to survive certain peaks.


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