LED Thermometer with LM35 & LM3914 - PCB Tutorial

This is a wide range LED Thermometer, it can be used for measuring temperatures between 0 and 150°C Celsius! - The sensor that mounts is an LM35 while driving the LEDs is an LM3914, all with a five color scale. As you can see the in the circuit diagram, output of the LM35 is connected to the input of the LM3914, and there is also a 47K trimmer through which to make small adjustments of the instrument. The LM35 output is a voltage signal (V+) and varies with temperature variation, directly calibrated in °C Celsius.

After trying the excellent service offered by JLCPCB I recommend it, the quality of the PCB is high, customer service is always available and professional, the time of realization is short and the delivery of PCBs is by express courier. JLCPCB is a great place to get hight quality custom circuit boards at an extremely low price, you can buy 5 PCB Boards (Any Color) for 2$ !!!

Components:
- 1x 100K Trimmer
- 2x 1K resistor
- 1x 18K Resistor
- 1x 10K resistor
- 10x 5mm LED (3 Blue, 2 Green, 2 Yellow, 1 Orange, 2 Red)
- 1x 3mm LED (as pwr LED - any color)
- 1x DIP 18 Pin

*Don't use my PCB for profit or sponsored videos.

HD Photos

This circuit must be powered with 5V DC, below I leave the references to view: the electronic circuit diagram, the PCB and the Gerber file to be uploaded directly on the JLCPCB website.

- Circuit Diagram: See at: 0:28

For any other questions you can ask me for explanations in the video comments:)

Music:
"Affectus" by Vexento
"Devotion" by Vexento

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WARNING: This video is only for demonstration. I don't take any responsibility for damage to things, people and animals.

#LM35 #LM3914 #Thermometer

[niko]

Thank you so much bro, I had project work and I chose this thermometer and got the highest

[LC-uemp]

Thank you sir for your videos. They help me learn and make me happy.

[kiranbabu]

Simply superb, can the temperature be displayed on led board. Instead of many led lights can a single multi coloured led be used. Thanks in advance

[tonyd]

Beautiful stuff. Molte grazie, Stefano. God[Bible] Bless.

[hariniparanthamansumathy]

what is the each led temperature range .. can you please tell me

[Vorterix]

Does this pcb come with coronavirus? :(

[mikewelch]

Stephano, I have the PCB file in my JLCPCB cart. I am going to order these circuits. But before I do, I was wondering if you could advise me about an alteration to this design? In place of the LM35, could you offer a suggestion to replace it with the KY-024 linear Hall Effect module? I’ll wait on your reply before placing my order with them. Thanks!!!

[whitefeatherflock]

U have attached a nine volt battery 🔋 na or any other to test the circuit

[robertheselwood]

What is the purpose of the 18K resistor on Pin1 led

[gumm]

What would I have to do, to change the increments of the temperature? For example 5 degrees? Thanks

[HenryGhost]

how can I make something just like this but measuring only temperatures between (for example) 20 - 40 ° C ??

[АлександърКолчев-хп]

is it possible to measure below zero also?
like -20

[estebanhm]

i think you should adjust the trim to the real temperature where you have.. because you actually could have damaged the circuit by setting it to 0 celcius and should be on the real temperature you are located. So in that instance you problably remove or lowest the accuracy of the transistor specially if the soldering iron was on hot enough to melt a bit the poor transistor

[fuelknightmare]

Can you please provide a schematic and pcb file. Thanks. need these for my school.

[احمدابراهيم-قفن]

please, I would really appreciate it if you can send me the proteus pcb lay out of the project, love your video its very useful.

[tonyd]

Dear sir, can one cascade two or more of these drivers to achieve more steps for a reduced rate of temps (0- 50C/32~120F) (for higher resolution), please? (w/more LED steps). (The idea is for a thermometer-like board, for use, in 120F to ~25F environment). Please don't spend too much of your time answering kindly. Just wondering if it's possible. Thank you. (Your results with the work displayed it awesome). 🙂

[wr]

Pretty nifty little project. I may have to look into acquiring one. I am a would-be electronic hobbyist. I know many things, but not enough - I am no electronic engineer. I have a very ambitious (for me) project in mind and need some help. Could you or would you (or anyone else) be willing to help? What I am seeking to do is randomly flash a field of 50 sets of 6 LEDs. I also want to make a field of 30-50 LEDs be constantly on, but randomly strobe the LEDs in each field as though they are getting a voltage spike. I don't even know if any of this is possible. I have found that maybe the 555 timer and the 4017 counter might be the ICs I need. I am not sure about caps or resistors or transistors. Timing is a challenge, too. Your help would be greatly appreciated. If this could be made on a PCB, that would be soooo cool.

[itcprojects]

like to see one that is for Hot and Cold Thermometer if possible ?

[antonioagostinelli]

Hi!
Nice project!
Is it possible to have an estimation of the overall current consumption?
What voltage are you supplying the circuit at?

[sokauo]

Can you make a tutorial on how you create your pcbs??