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Questions tagged [lm35]

14 questions
7
votes
7 answers

Fluctuating readings of LM35 temperature sensor (+- 5°C) with Arduino UNO

I am trying to read a LM35 temperature sensor with Arduino UNO which I got as a gift. The issue is the fact, that my readings of sensor are, well, suspicious at least - they jump with each reading some 5 °C up or down. I had used several posts how…
Rao
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About Corrupted LM35 IC and Arduino port problem

I have one Arduino Uno which was working fine by below circuit(link): But when I have connected the new bought the LM35 Ic by the below connection: The Arduino UNO don't be recognized by the my Ubuntu OS as you can see below: And by removing the…
Soheil Paper
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2
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0 answers

Different behavior when Arduino Micro powered by laptop USB vs portable charger USB

I'm working on a project that uses an LM35 temperature sensor to control a few LEDs. Above 97 degrees, one LED should switch on. Below 95 degrees, it should switch off and the other should switch on. In between those temperatures, the LED state…
pyfi12
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2
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1 answer

LM35 readings are erratic

My son just did the Love-o-meter project in the Arduino Start Kit. However, the sensor readings of the LM35 temperature control vary widely. Below is a sample. What could be wrong? Sensor Value: 217, Volts: 1.06, degrees C: 105.96 Sensor Value: 587,…
Kaveenga Wijayasekara
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1
vote
1 answer

LM35 temperature decreases when heated

I have a question regarding the LM35. The sensor is supposed to have values that are to be directly proportional. But instead of the temperature increasing, the sensor values decrease. This is my setup below. It seems to be a standard setup in…
fireblazer10
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Output from LM35 temperature sensor varies wildly

I've seen other posts on this board which related to output from the LM35 sensor, but mine seem to be more 'extreme' than anything else I've seen. I've connected the pins as is commonly suggested - left hand to 5v, middle A0, and right to GRN and…
Andy_Smart
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Noob here.. Need help with a thermostat controlled relay

So After trying several sketches for a LM35 and none working I finally found one that was giving me accurate results. The problem is the code is way over my head. I was able to modify it enough to get the serial and temperature to a LCD but I cant…
Dnozz
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1
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Can't get the right values with the pulse sensor and the LM35 temperature sensor . Reading 2 anolog sesnors

I am trying to combine the two sensors (pulse sensor using this library and LM35 temp)(on a Arduino UNO board),but there is a problem with them when is a noise at the pulse sensor .The values are fluctuates especially the LM35 it goes from 31…
Wolffyx
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1
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1 answer

Temperature Sensor not giving proper values

In my current project I am reading temperature through sensor which is having only two wires. To read sensor values, I have used below schematic which I have found on Arduino Project Hub site. In my project I am using below Arduino…
karanrp
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0
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2 answers

my LM35 temperature sensor gives weird measurements,

Board: esp32 I know my wiring is correct because I get data from the sensor, but the data is a bit weird. At 22 celcius I get 140, even though if I do the voltage calculation (* 0.473372) it still doesn't work. the number 0.473372... comes from…
user216002
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1 answer

Connecting HC-06 and LM35

Hello I am trying to send temperature data via bluetooth using the HC-06 module. Since TXD and RXD only allow 3.3V I have divided the circuit into two like the below image. Is this method correct? or is there a better way to connect both two? Any…
Satsuki
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0
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1 answer

Need help with sending Arduino data to web page with ESP8266

I am developing a system that reads data from an LM35 temperature sensor and forwards it to a web page using an Arduino Uno and a ESP8266 WiFi Module. The data flow is as follows: LM35 --> Arduino Uno --> ESP8266 (Having a web server) -->…
nishthapa
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1 answer

Interfacing LM35 and MQ2 with Arduino

When I interface LM35 temperature sensor and MQ-2 gas sensor with Arduino - my LM35 sensor gave incorrect values. From research I've found out that MQ-2 gas sensor dragging the AREF voltage down and causing the error due to its 31ohm heater that…
mugdho nahian
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1 answer

NodeMCU unable to connect to mobile hotspot when I include codes for reading the temperature sensor

Good day. The NodeMCu successfully connected to mobile hotspot when i didn't put any others codes except the Wifibegin etc. Howveer when I include some codes for temparature sensor, it keeps on connecting whereas the everything else including the…
mocha234
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