Make an Arduino Temperature Sensor (Thermistor Tutorial)
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- Опубліковано 8 вер 2024
- Make an Arduino Temperature Sensor (Thermistor Tutorial)
In this video, we walk through the steps in setting up a thermistor temperature sensor on an Arduino Uno. First I show how to output the temperature readings to your serial monitor. Then I go over how to connect and output the temperature readings to a 16x2 LCD display.
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More information about this project can be found in the tutorial at: www.circuitbas...
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To anyone getting negative values, measure the resistance of the thermistor and use a resistor with the same value! I had the same problem with the thermistor I got from a cheap Arduino starter pack. Turned out it was not as the seller described a 10k, but a 100k resistance thermistor. after I changed the resistor to a 100k one to match the thermistor, I got plausible values.
Also thanks for putting together the formulas, Circuit Basics, I gave up after reading about it for 10mins.
Exactly, and if you want to be very accurate, measure both, and try to match, you may find that some 10 K's read high, others low, I tried six before I got an exact match.
It should be log(10000./(1024./RawADC-1)) via the voltage divider equation.
The sensor uses a thermistor, which changes resistance at varying temperatures.
The Steinhart-Hart equation approximates the temperature at a given resistance of the thermistor via 1/T=A+BlnR+ClnRlnRlnR.
Since the Arduino cannot measure resistance directly, a voltage divider is made by simply adding a resistor in series with the thermistor.
Since current is the same in a series circuit, the total current I=E1/(R1+R2) and I=E2/R2.
E1 is the 5V you apply to the + pin.
R1 is the small resistor in the circuit, which you can measure with a multimeter to be about 10000 Ohms.
R2 is the resistance of the thermistor.
E2 is the voltage measured with the S pin in reference to - GND using analogRead().
Therefore, E1R2=E2R1+E2R2, then solving for R2=E2R1/(E1-E2), which can be rewritten as R2=R1/((E1-E2)/E2) and further as R2=R1/(E1/E2-1).
So, the resistance of the thermistor R2= 10000/(1024/analogRead(A0) - 1) .
Arduino ATmega 328 microcontroller has an inbuilt analog to digital converter,it can sample and quantize analog reading to digital.
Do we need to calculate the thermistor resistance manually... And how to enter the values in Arduino to change into temperature
Thanks a billion! I was digging through my component collection this morning and came across a bag of 40 thermistors, 20 rod and 20 glass bulb. I have no friggin idea why the hell I ever ordered them, but I must have had something in mind at the time, could have been a few years back but I am sure I never did anything with any of them. So I decided to do something with at least one of them today. I spend much of the morning looking at different projects done by others, many very complicated, others rather simple, some that appeared to have less of an understanding of these things then I do. Then I found yours. The instructions were simple, code readily at hand, and it worked right off first try, what a deal! Instead of using a breadboard, I have some screw terminals with plugs on the opposite side, this worked great for experimenting with these things. OH WOW It just came to me, my niece wanted me to build here some temp sensors for her ghost hunting outfit! I got these for that, and never got around to building it, as her mom passed on right after I got them, wow. Well now I have to figure out how to build the group of four sensors to tell if a cold or hot spot develops in her target location. Fun building for her ghost adventures, I am not really into ghosts, but I love building detectors of all sort for her outfit!
The code shows R1 = 10000 but the fixed resistor in your circuit in 100k or 100000. Is the code wrong?
Your sensor maximum rezistente can be deferent
This was very useful, thank you for the great explanation! Exactly what I need to finish a project I'm working on :)
instablaster...
Thanks for the how-to, I'll have to refer to this again when i get all the parts in.
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.
lmao these are even worse, instead of 90° room temperature I now have 143° room temperature. Great.
I almost always use LM35 for temperature tansducer. 10mV/°C, precisely 1.00 volt at 100°C.
Cheers from Indonesia
Wah ini
Wah ini
Great job, and a helpful circuit.
I have made a temperature sensor circuit using NTC and without arduino, just in case if anyone want to understand how does it works.
yes i will like to understand please
Short but sweet. Excellent intro project.
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Excellent Thankyou. I probably won't be using an Arduino but the info on Thermistors and converting from V to C is just what I was looking for. Hopefully going to control some fermentation with the info :)
This is just awsome! Simply explained and thus perfectly understandable.
Add the termistor to Gnd side of V divider. Suppose if smthng goes wrong & thermistor shorts it would short 5v to the analog pin without resistance so 10K before thermistor is safe
Yes!!! Basic enough I can understand!!!
Thanks a lot. I recently did scavenge a thermistor from an old laptop battery and I was really thinking how could I use it and I just made a thermometer using it although I had a hard time to obtain its resistance value but I finally calculated it to be around 10 k ohms
would be good if you explained what each component does
Chris Scully the thermistor (thermal resistor) and the resistor create a basic voltage divider. the thermistor's resistance varies with temperature. The voltage divider takes that variation in resistance and turns it into a variable voltage signal. Using math and a little logic you can map that signal to what ever scale you like. Fahrenheit, Celsius, Kelvin etc.
Chris Scully qtips clean wax out of your ears.
If you don't know anything about electronics you should close this video and learn basic things about them
Explaining the code and all those strange values coming from nowhere is a must, without that the video is pretty much worthless, can't understand how it works besides the voltage-divider, like if you need to connect the thermo-resistor to ground or use a ptc instead of ntc, then you can't do anything with the shown code, all you can do is just copy&paste blindly without any understanding of what is going on, this is not the way how one can learn anything, even if the global schooling system works like that, but no one of us goes there to learn anything, but we watch videos like this to learn things.
How did you come up with these numbers:
Temp = log(10000.0*((1024.0/RawADC-1)));
Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp
This equation comes from the thermistor data sheet. Check this before imputing the equation. Different thermistor have different coefficients.
this is a answer www.thinksrs.com/downloads/programs/Therm%20Calc/NTCCalibrator/NTCcalculator.htm
Marcin, I actually found out that the code was slightly wrong and should be log(10000./(1024./RawADC-1)) from the voltage divider equation and now the sensor works fine :) Nevertheless, thanks for the link, it helped me understand the formula better!
Excellent video. I am new to Arduino world and this served as a great introduction to Arduino for me.
Thank you! Although, the page from the link to circuitbasics.com it's a bit different that the one in your video.
@Tatum Leonidas Hi there! I'm not sure how this would be related to my original comment. I commented the video, not about something else.
SO COOL! SIMPLE AND EASY TO FOLLOW. YOU DESERVE MORE LIKES
Looks cool! will try this when i'm home i like the simplicity you put into your vids
What would be the simplest way to use the data collected and create a longterm graph? (weeks of data)
Use a sd reader and simply add your readings to a simple text file
Great Chanel great video. Can u upload how to conect the lcd to the androino and what is the resistants that need?
Does the formula in the code change if I use a 10K thermistor and 10K resistor?
I just used one to control a relay, i used the same code and it worked just fine
This was useful. Thank you. Does the thermistor need to be calibrated?
Which resistor did you use for the display??
Thnx :)
I needed to put the sensor to the 5V pin, if not it was showing me 10 degrees less.
i don know why the 100 k divider.. i mean you can put the thermistor on the 5 v tough. and once its increase its value or decrease it change its output voltage. this can be converted to temperature in arduino.
equation of R2 will be R1 / (1023.0 / (float)Vo - 1.0)
Can't copy the code...link is not working properly...can copy everything on page except the code itself???? No matter what browser i try...
Hello. Great Job!! Tks.
Look, is there any possibility to 'log' (save) this data into a database or TXT file for example?
That is the best introduction to Arduino I have seen thank you!!
I love my arduino! ❤️😀👍
Another excellent video. You did a great job !!!
Why am I getting readings of -459.67 F repetitively?
what are the resistance value for the second and third resistors?
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Excellent! Thank you!
nice video , can you help me and tell me where or how you found Steinhart-Hart equation variables?...
great.
will try.
thanks.
this was a really good video. thanks a ton
sir i need clear connections of lcd and aduino as explained for thermistor and arduino will u plzzz made a video oevrall for lcd connections for temperature detection
Tanks for video😍😍😍
Plz help what can i change if i use 10ohm thermestor
Dude. How do you program a Thermal Checker during like the ones they're using to check your temperature.
how temperature readings may differ if we cover one side of thermistor with hand and the other left open to surroundings..???
will there any effects of environment temperature to it too or just the temperature from the hands are sufficient to drive the thermistor.?
If I used another thermistor instead of the resistor would this give me the difference? I want to monitor the cooling of my radiator.
Thanks, this is a really amazing project! I am having a slight issue where it's reading 194 degrees though... I'm pretty sure my room isn't on fire right now either. Any ideas?
Or you are not using a 100k ohm thermistor. This is a potential divider circuit. The output voltage you read all depends on your components ‘ resistance.
you probably needed to subtract a value from it to bring it into correct range
that was great , can you ask my question? how to read the pirani vacuum gauge using arduino?
Can you make a distance measure curcit
Doesn't a thermistor heat itself up when operating (there's current passing through)?
(sorry, I don't have sound on my laptop here, maybe it was mentioned in the video)
Can we change into Celsius with the lcd display??
Is this sensor can detect ultra low temperature? Below -80 degree celcius? Your comment very much appreciated
The epoxy style thermistors like this one usually only go down to around -55C at the most. If you need to monitor lower temperatures you could always use a dry ice TempTale
thank you man
is that a NTC or PTC thermistor? because the code you provided makes the temperature drop for the thermistor Im using while temperature increases...
The output of a thermistor is nonlinear, in the calibration block of code how to account for it?
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.
i am looking to convert an old freezer into an arduino controlled air conditioner, how would you recommend i do this
great info.. thanks...:)
Can I do it with a NODEMCU module?
Hi, thank you for this demo, Is that possible to mount 2 thermistor at the same time ? and the output data shows as curve ?
noob question. Why the resistor needs to be the same value as thermistor??
nice video but i have some question.... i have a project like this video but in my project if the temp up to 50 C , i want red led is on if below 50 c the green led is on.... why make it work? thanks before....
AS we are using 100k resistor for R1 the value of variable r1 must be 100000 but why the code has value 10000 for R1?,some one please answer if you know
Hello brother this circuit make with volt and current meter means volt amp Watt and temperature show on one display for 5v
Please make a More video
Could the Arduino have 64 thermistors that it monitors in sequence, then repeats?
Or have the Arduino work in unison with an STC1000 temp monitor, and connect the 64 thermistors across the terminals of the STC1000
Why it stop serial.println when temperature is up 38°c
Hi, I have been using a 10 ohm thermistor which heats up a lot when I use a 10 Ohm resistor. So, can you please tell me what should I do so that the resistor and thermistor don't not heat up so much because I just burned myself without realizing today. Any help will be appreciated
please master, how to combine three or more temperature sensors in an arduino and display on an LCD, I wanna making Thermal
Conductivity Meter
How to send this data to nextion display?
keep up the good work
Yes
No
Yes
Is it possible interfacing ultrasonic sensor HC-SR04 with Xcos? If yes, can you tell me how?
Give the link for downloading math library please
well, now I know what to do, thanks
you probably dont remember posting this comment but did you end up using the code on the website? Or the one in the video?
Do you know the range from that thermistor?
I have a module of that thermistor. Will it work to module to?I
hey there I have a ntc thermistor 4k7 I think its blue with UEI 085 on it so not sure what kind is it how can I detect on what kind cause the reading it give me is 200 + F
and 100+ C
great tutorial, thank you. i have an homework. the goal is to measure the temperatue and the moisture level of a fridge wirelessly. analyzing and saving the data gathered from the device. how can I do that?
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Well done
I intend to build one but i want to measure very high temps(160-200 Celsius). Using a thermistor from my 3d printer as it can measure up to 250 Celsius.Do you think it will work?
Thanks bro. But why is showing negative temperatures for me?
would this work with a high temperature thermocouple as well?
Hi sir, c'est une très bonne présentation
if we want to connect to lcd screen how many resistors needed and with what resistance
Hi what if I wanted to get a table containing each degree of temperature with its own resistance, what can I change in the coding program?
will it work without contact and can we use 10 k resistor how will the code change
can we do the same on arduino nano?
Is this suitable to measure surrounding temperature?
Hi! Thanks for the help i would like to know how can I attache Bluetooth and take the reading on my phone
You have to dev an app. Then, you have to send the data by Bluetooth.
Great video 👍🏻
Is it possible to run the thermistor with 3,3v? The NodeMCU´s analogread pin only supports up to 3,3v :/ If yes, how? The analogpin outputs values of 0-1024 like the normal arduino but it doesn´t work properly...
what range of temperature we can use it? could we use to measure about 300c?
I got this to work and would like to use it in my greenhouse. I can put the Arduino in a weather proof box, but how do I put the thermister/resistor on a long wire in the greenhouse? I am sure someone has done this. Perhaps you could show me how you did it.
Bill Grubbs if you are running a long distance you will have to take voltage drop into consideration. use some small gauge communications wire, something like shilded twisted three wire. solder the whole voltage divider setup on ther end and use heat shrink on all the leads and a larger piece to bundle them up
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 ?
Nice one...however i have a question.How to add a mosfet to the code to controll a fan when the temp reach a set point?i don't know how to program arduino that why i ask..thank you!
use the code for led on mosfet works fine
Can you make this water proof?
How do u put the lcd display on the bread board
If we use LM35 sensor can we add same code to that??
I copy pasted the code and when I touch it it goes down instead of up and im pretty sure im warmer than my room. why is that happening?
Great thanks.
when i change it to celsius it doesnt change numbers with both f and c it shows it as minus
excellent!!
I have ntc 10d/9 what to change in code?