LED Temperature Indicator Circuit - LM3914
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- Опубликовано: 9 фев 2012
- This circuit is an easy, reliable circuit for monitoring the temperature of your engine oil/block, hot water heater, or engine coolant.
Schematic: i.postimg.cc/vZR0THxV/temp.jpg
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Наука
Thank you for your videos, easy to understand.
Thanks for this, I was able to modify it for engine use.
Vash Spiegel Good to hear! Please rate Thumbs Up and share my videos.
Thanks!
I was looking for something like this for a computer case to monitor temperatures. This is the best thing, everything else was temperature sensitive LED shower heads! I don't know anything about circuits, but this one doesn't seem too painful.
Yes. Very easy. Video coming up.
Very Nice.
can i get to know how the temperature range is adjusted by adjusting the pot??
Great vid, thank you! Do you think its possible to wire this circuit so all the LEDs light up at low temperature and then they go off one by one as the temperature rises? Using a similar NTC sensor. (104F=925Ohms -> 302F=32Ohms)
I'm thinking to DIY a dynamic redline indicator for my tachometer in my car. Thanks in advance
Use a PTC thermistor instead. :-)
LM35 is a very precise temp sensor , but this circuit will also get the job done.
hi, i'm looking to build a high temperature indicator circuit. Do you think i'd be able to reach temperatures 500-800 celsius if i changed the thermistor?
The best way to do that would be to buy a thermocouple on ebay. When heat is alpplied to the thermocouple, a very small voltage is produced between the 2 dissimilar metals in the tip. You then can take the MV output and use that to drive a circuit(comparator) which will trigger an LED when a certain temp is reached(due to an increased MV output from the thermocouple).
Thanks for watching. Be sure to check out my video playlists.
Thanks for the video. Why does the LED continue to glow for sometime after the match stick is removed?
Sounds like you need to adjust the circuit's sensitivity using the POT's, and double check all resistor values and circuit connections. Thanks for watching!
Hello!
First off, thanks for the circuit.
One question though: if I use a 10k thermistor how should I adjust the other resistance values? (also, just to confirm, it is a ntc thermistor, right?)
Lincoln Junior Hi there. The thermistor is NTC, not PTC. Not sure of the values for modification. You can try adding a 22k to 33K resistor in series with the thermistor. Also try a 20K POT instead of the 10K.
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I will make this for my final project. thanks!
Great to hear! Be sure to check out all the other great circuits shown on my channel. :-)
electronicsNmore hi sir! can i replace the potentiometer with a 10k resistor instead? i tried it on proteus it perfectly worked but idk if it is going to work on the actual hardware.
Nakedmolerat Yes, once you have it properly set you'll know what value to use.
i finished it. your circuit worked perfectly. thanks again! :)
Great to hear!
Is there any way you can send me a step by step instructions on how to make it? I was unable to connect to the link in the description.
Your browser is the problem. Try another browser. Thanks
is it NTC or PTC thermistor???
please tell me what kind of thermistor did he used in the video ? when I try to search 10k thermistor there are too many types what r u using ? please ASAP .
Refer to the link below. They're very inexpensive. Many other items are also sold at that website. If you need a coupon code for more expensive purchases, just ask. :-)
bit.ly/2mMZlSm
nice work
Thank You! Be sure to check out my other videos as well, and share with others.
how did u define range of temperature
Hi wat is the temperature range? also share a how to do video with a buzzer for high temperature for industrial machine which uses a bearing which gets heated very fast...thx in advance
+Gugan S
Hi. I did not test the full range. If you want to add a buzzer, please watch my other video below. You can substitute a buzzer for the cooling fan.
Be sure to rate thumbs up, and share. Thanks
ruclips.net/video/UO1_229BGMA/видео.html
thanks men
You're welcome! Thanks for watching. Be sure to share my channel with others. :-)
url is working ....thank you !!!!!
You're welcome! Be sure to rate thumbs up and share my channel with friends. Thanks
is it posible to make it turn on a fan when the last led is on and make the fan last for a few seconds? If yes then how.
I think with a combination of capacitor and resistor before the fans you can do it.
Sooo... 11 years later... you're probably active here to answer this... but can this be achieved with a KSD9700? Would an LM35 be better? I intended to mount it to a heat sink. EDIT: Probably not. The KSD9700 is a thermostat that's open or closed at a preset temperature whereas the LM35 would allow voltage proportional to the heat.
a good video ! but i can not see the link in the video .i want to have the schematic.thank you for answering.
+Mohamed DOUMI
Video description area.
hi I want to make something that uses nicrome as a heating element and a thermistor to regulate the temperature. would you know how to make that?
The thermistor could not be placed too close to the resistive wire. You may need to use a thermocouple circuit which triggers a triac or relay. Take a look here:
www.banggood.com/search/thermocouple.html?p=U627203391019201512Z
+electronicsNmore I have no clue to be honest. I've tried to learn but I'm a hands on learner. is there anyway were can talk off youtube? if you need my email just ask. I would like to make you an offer
David Stone
Unfortunately, I have over 340 videos with many people asking to chat on the phone. I cannot do that. Please visit "Talking Electronics" website to learn more about electronics. Thanks.
+electronicsNmore I don't want to chat over the phone. I want to invent. Unfortunately I don't know how to make circuit boards. I've tried to learn but I'm a hands on learner and its like reading Chinese I can't self learn. I do however want to email you so that I could possibly pay you money to make 1 for me and hopefully a video of how you made it. My email is stonedavid70@yahoo.com. I look forward to negotiating payment amount with you ( I'm not going to low ball you) and hopefully you can pass on some knowledge to a beginner.
+David Stone
Have you seen my video showing how to make circuit boards? Video link below.
ruclips.net/video/lvNCKwAcg90/видео.html
nice... u can substitute maybe with multicolor LED for less LEDs
Is there a circuit for measuring cold instead of heat ???
Hi there. I'm sure if the thermistor location was moved, you could reverse how the circuit works. I also have this video:
LM741 Temperature Indicating LED Circuit(Hot/Cold) 6V
thank
You're welcome! I have many great videos on my channel covering many different subjects, so be sure to look over my extensive video playlists for other videos of interest to you and most importantly share. Thanks
what value of potentiometer to get for 50k thermistor
All information is in the video, or the link placed in the video description area. Thanks for watching!
what if I use 10k Thermistor ? and can you tell me where is VR in the circuit ?
VR is a "variable resistor" or "Potentiometer".
Aeona Paula i have also the same question. pls tell me how to connect
The VR is the 10K on the far left side of the schematic. Use the center pin of the VR and either side.
electronicsNmore pls tell me how to connect potentiometer
FINally i can do my project, the problem is that the image was not indicated the color of leds..
thanks for advance... ( the speaker of my laptop is not functioning/damage)
AlSCI Warz The green LED's start at pin #1, then 18, then 17. other colors follow starting at pin 16. The last LED is Red pin 10.
Thank for watching. Be sure to check out all my other videos and share.
thanks....
How about using 2 ic?
Why?
good
Glad you enjoyed the video!
please make a project K type thermocouple .....
How u built the circuit? from the datasheet?
Should be a link to the schematic in the video description area.
Thanks For Watching!
Thanks, i found the link. But were u using NTC or PTC? does it matter?
NTC
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how do you make that
+David Stone
Hello. The link is in the video description area. Thanks For Watching!
can you plss send me the link of its circuit ?
Located in the video description area. Thanks for watching.
Don't forget to check out my video playlists as well.
@@electronicsNmore URL is not working. kindly, help.
blog and URL is not working !!!!!!!!!!!!!!!!!!!!!
Check now.
Can you give a schematic, pls, thank you. I tried many, many times but it did not word. I think something is wrong in your old circuit diagram
+Huy Khôi Hà
Hello. Nothing wrong. Everything is fine. There is a link in the video description area.
Thank You
+electronicsNmore Following your schematic, I connected pin 9 and pin 3 together to Vcc. Pin 8, pin 4 and pin 2 to ground. In my circuit, NTC 10 was used to connect pin 5 and pin 6, resistor 1K, I used 10K volume variable resistor to connect pin 5 with ground. I burnt the NTC, but my circuit did not work. I removed variable resistor 10K, resistor 1K and NTC gradually and I supply 9V, the LEDs still lighted together. I would be grateful if you give me your help, thank you
Huy Khôi Hà
This is one of the simpler circuits on my channel. I suggest trying another IC. You may have a faulty IC.
Thanks.
+electronicsNmore Thank you. Ah, can I use 10K NTC instead of 47K, is it problem???
Huy Khôi Hà
You will have to modify the other resistor values if you change the thermistor value.
hello sir please make K-type thermistor
Can I have a list of the components please?
+Ryan Talattad
Hey Ryan. There is a link in the video description area.
+electronicsNmore thanks. but what is the value of the potentiometer?
Ryan Talattad
10K
I NEED TO HAVE 20 LED HOW CAN I DO IT
20 is a lot of LED's! This chip does not have that many outputs. Sorry.
use 2 lm3914/16/15 linked together.
+nndondeni mudau The LM3914 data sheet has sample circuits for driving 20+ LEDs
there are no circuit diagram
Hi there. Link is in the video description area!
electronicsNmore is not available
.electroschematics. com temp meter for schematic