LM35 with Arduino | Temperature Sensor | SdevElectronics
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- Опубліковано 25 сер 2024
- In this Tutorial, we'll see about How to interface LM35 Temperature Sensor with Arduino & demonstration.
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#SdevElectronics #Arduino #LM35
GREAT VID KEEP IT UP!🤩
Thanks 🔥
Your formula to calculate temperature is bit wrong. It has to be "float millivolts= (rawvoltage/1024.0) * 5000; ". As lm35 is of 5 volt, you need to multiply it with 5000. and its output ranges from 1024. So dividing with same.
why 5000?
You see though, he wasn't calculating the millivolts from the lm35. He was calculating the actual temperature.
@@limitedbraingame9382 1
ua-cam.com/video/M3eEOLkACmc/v-deo.html
Thank you, this tutorial was awesome. :)
ua-cam.com/video/M3eEOLkACmc/v-deo.html
this is good, can this lm35 be used to determine the cooling temperature of a fridge or 1horse power A/C?
Yes you can use...
when i plug it the sensore got very hot it almost burned if i didn't unplug it even when i use 3.3 voltage
i'm having some problems, i don't know if my arduino is not working, or the sensor, it's my first time testing both, but the monitor shows numbers that keep increasing and then decreasing the value, even when the sensor is not connected in the Analogic output,
You'll get random values, when nothing connected in analog Pin.
I think your LM35 may be damaged, Try another one.
You are most propably encountering Electro Magnetic Interference induced on the wire that connects to the Analog input pin. Eg: led lamps, cfl lamps, badly shielded switching psu's and even RF noise. Measuring unbalanced unfiltered small signal analog voltages is always a pain. However, this exercise will give deeper insights on how the adc works. (Linearity errors, reference voltages, etc.
@@houtmann774 it was 5 years ago, I can barely remember the topic but if im not mistaken my sensor was fried or something like this. I remember testing a different sensor and it was working fine.
Thank you nevertheless 🙏
thanks its very easy to understand.
Good
My sensor beacomes too hot and shows value more than 200 in the output. Can you help me with this ?
Ur explanation was so gud ... But I have a doubt ..there r 4 types of temperature sensor right ... So thermocouples for measuring water state nd liquid state thermistor ... In this vedio u measured a solid state so which type of temperature sensor it is...?? Plz respond
Lm35 it says
Hi,
can i make the same princip with a NTC resistor instead of LM35?
If yes, can i make it with 5 NTC‘s during the same time?
Many Thanks in advance fot help and reply.
Best regards
ua-cam.com/video/M3eEOLkACmc/v-deo.html
I like this circuit, can it be reversed to show red with low temperature instead ? I want to use it to show if the heat isn’t working !
Yes you can. Switch the LED
When I powered my arduino with a 9v external power supply adapter, the reading temperature every sec is not stable, it fluctuates from 32, to 19, to 22, to 27 so on.. please help
Hey, can I use 10k or 220 resistor instead of 100k ? I just dont have 100k resistor
Yes I noticed the Long Pinky Nail too...
Hello there. Your video is very informative. I have a question. Is there a way to code an alert in difference of temperature change, for example, when the temperature increases or decreases within 5 degrees?
Good explanation
Please can a triton board be used in place of the bread board
this guy really wrote tempr instad of temp
Please help I want to understand the (lmvalue * 500)/1023; in the code, can someone please explain.
Přivedené napětí na lm35 je 5V. V analogové řeči arduina je hodnota1023 rovna právě 5V. Dále platí z datasheetu k lm35, že 10mV=1°C. A vy potřebujete převést signál ze senzoru, který je ve voltech na milivolty, konkrétně na 10mV, proto je násobeno 500. Kdybyste násobil 5000, dostane 1mV, ale vy chcete 10mV, abyste poté zobrazil °C.
do i need to design the circuit in the proteus first before writing the coding?
No need,
Connect as per the circuit diagram, and upload Arduino Sketch
@@SDevElectronics when itry to open the serial monitor, it said that "Error opening serial port COM3. (Port busy)" so how????
What kind of wires did you use to connect the LEDs to the Arduino board?
Dupont wires...
I used DIY Dupont wires with PCB headers
Hi, I just wanted to ask you..how can I change the temperature?? Like I want to set it 35°C and when it hit 35°C the buzzer will on...
You can change temperature in 18th line of 5:57
@@SDevElectronics ok thanks youuu
is there a library for this? because when I inserted the sensor the Arduino turns off please help.
hi can I know to which pin did you connect the blue wire? appareciate the help.
Ground...
Circuit diagram inside the video
Refer circuit diagram ..
@@SDevElectronics thank you so much:)
thank you for this beneficial video. i have a question, why when i hold the lm35, the temperature becomes 0? isn't it supposed to be body temperature, 37?
Max 150 graus
it doesnt show body temperature because it cant detect temperature through skin
ua-cam.com/video/M3eEOLkACmc/v-deo.html
Does it work with skin temperature? The sensor
Yes,
It's range = −55o to +150oC
Accuracy = 0.5oC
Why multiply by 500 and divide by 1023?
There are two prerequisites. Firstly, the LM35 can only output a max of 1.5 volts and does so when the temperature is 150 degrees celsius. Secondly, analogRead returns a value between 0 and 1023. It returns 1023 when the analog pin measures 5v, 0 for 0v, and anything between.
Let's first convert the analogRead to volts. Let's first divide by 1023. This will give a ratio between the given analogRead and the maximum value a read can give. The result is between 0 and 1. Then multiply by 5. This will give the correct voltage reading of the analog pin (because as mentioned before, the max volt reading is 5v). Now, let's imagine a situation where the LM35 is outputting the full 1.5 volts. This means the temperature is 150 degrees celsius. What do you need to multiply 1.5 by to get 150? 100. Because the voltage output of the LM35 is linear with the temperature, we will only ever need to multiply by 100. A slightly less voltage reading will give slightly less than 150 and so on.
So, in summary, we divided by 1023 to get a usable ratio, then multiplied by 5 to get the actual voltage reading, then multiplied by 100 to get the temperature:
tempr = lmvalue / 1023 * 5 * 100.
This is equivalent to what was shown in the video:
tempr = lmvalue * 500 / 1023
tempr = (lmvalue * 500) / 1023 (with the needless brackets)
Hi .can we use the DHT11 temperature and humidity module as a substitute to the lmd35 ic?if yes does the wiring the same
DHT11 is much, much better option.
Can you please upload a video of another circuit contating temperature sensor LM35
What's up for this project...
@@SDevElectronics it is great... Easy to understand.. Bt when i tried it the ends of the jumper wire started to melt and temperature of arnd 315 was show... How do i rectify this can u please tell?
sir i have have a problem my value decreases when i rise the temperature near lm35 ...what should i do in code kindly tell this.
same problem i tried it in different lm35 same code same wiring i dont know why it happening
@7:18 what is that thing called?
Buzzer, used to make noise
sir, it is known as piezo electric buzzer or simply as a buzzer.
If you want to send the temperature to a screen like an i2c oled rather than the serial monitor how do you do that?
bro kenapa led tu tak suka kecik
Nice. Can we use two LM35 connected to two analog pin (A0,A1) to read the temperature of an AC room and a NON_AC room? When I try that, the second sensor gives erranious reading. Please help me to know the reason. Thankyou.
void setup() {
Serial.begin(9600); }
void loop() {
float lmvalue0 = analogRead(A0);
float tempr0 = (lmvalue0 * 500)/1023;
Serial.println(tempr0);
float lmvalue1 = analogRead(A1);
float tempr1 = (lmvalue1 * 500)/1023;
Serial.println(tempr1);
delay(200); }
Use A0 & A1
If you get error, change LM35
@@SDevElectronics Thankyou verymuch Brother.
what means lmvalue?
User defined variable to store LM35 values, You can change to any text...
Hi, how to make it without arduino liby (without analogRead)
Simply connect 5v gnd pound respectively...
In output pin, it gives 10mV for every 1°C.
0.2V = 200mV = 20°C
0.5V = 500mV = 50°C
You can use comparator here...
Why the resistors 100 ohm?
It is current limiting resistor...
I don't have 220 ohm resistor, so I used 100 ohm resistor
@4:06 what is that thing called? The white wire
Two ribbon wires soldered with male header pins
@@SDevElectronics which label in arduino to connect the red,green and yellow wires?
does the 2 ribbon wires can replace with the jumper wires?
Yeah Sure
Check Circuit Diagram
NIce Bro, My project is on glucose detection by non invasive technique. If you have any idea regarding this, can you please do a video on this including code for that
With lcd 16x2 display and code
I'll upload this video, Tomorrow
A unha do Zé do caixão
How tomonitor an array of sensors?
You can connect the sensors from A0 to A5...
Read the value. Store them into arrays....
@@SDevElectronics thanks the problem its bigger my baterry has 35 cells i want to monitor each cell for overheating.
To monitor each cells, you should use a Sensor for each cells.
But reading 35 analog pins require 6 Arduinos,
By resolving this problem, you can connect the sensor and Arduino with 8:1 or 16:1 multiplexer ics ...
For example if you use 16:1 mux, you can read 48 inputs with 3 analog pins & 15 digital pins ...
With one Arduino...
I think the problem solved
@@SDevElectronics great thx
Give me arduino code please
sdevelectronics.blogspot.com/2018/04/arduino-lm35-temperature-sensor-b.html
Great video but please cut your nails