Questions tagged [lm35]

An LM35 is an analog temperature sensor.

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Weird but consistent noise in LM35 measurement

I'm developing an incubator which includes a hot air pump. I'm generating the heat with 2 40W-12V ceramic resistor from 3D printer conected to a transistor (IRF540N) which is controlled by an ...
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1answer
54 views

LM35 connected to amplifier unexpected output

I am trying to connect the output of a temperature detector LM35 to the input of an op amp. The op amp will later be connected to an ADC. The goal is to amplify the signal between 8C (80mV at the ...
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45 views

Amplify low voltage signal coming from lm35

I am using a lm35 to measure temperature from a box. The range of output voltage is 0.2V to 0.5V. I need to amplify this signal by 5. I tried using a non inverter op amp configuration with a LM358 and ...
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36 views

Unvalid output voltage of LM35 temperature sensor

I have connected once the Vss and Ground of my LM35 sensor reversely wrong. After correction of this, the output voltage is 0.5 V which seems to be invalid in room temperature. I'm not sure if the ...
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2answers
125 views

Transistor as a heater device and measured by LM35 temperature sensor?

The aim is to make a temperature control circuit using an Arduino Uno as a controller, an LM35 sensor as feedback to measure the actual temperature, a TIP31C transistor as actuator to control the ...
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2answers
80 views

Can LM35 temperature sensor be used to measure temperatures in bone in an in vitro setting? are they comparable to K type thermocouples?

I belong to the medical field. I have zero knowledge about electronics. For my thesis, where I will be measuring temperature within the bone during drilling, I am required to use a temperature sensor ...
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1answer
63 views

lm35 Temperature Readings are not right after sealing with Hot-melt adhesive (How mush has it Soldering max Temp toleration ?)

I need to seal the LM35 temp sensor so, I used this device for sealing it: The code I have used are: ...
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3answers
83 views

LM35 max input current - I have a wrong output from the sensor [closed]

I’m currently doing a small project. I’m trying to make my first pcb. That’s for a light I made. But the LM35DZ outputs a wrong voltage. My LM35 puts out 4.6V instead of 380mV. With a 12V - 2A ...
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2answers
185 views

LM35 sensor giving weird readings [closed]

I am a mechanical engineering student and I'm quite bad at electronics so I decided to post here. For my dissertation, I require 2 circuits using the same 5.7 V DC power supply. One of the circuits is ...
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1answer
340 views

LM35 temperature sensor strange behaviour

I have a set of LM35 temperature sensors hooked up to an Arduino. I find it hard to believe all 3 sensors are broken. The Arduino code is very simple. ...
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1answer
260 views

LM35 bypass capacitors

I'm used to always use 100 nF (0.1 uF) ceramic capacitors as bypassing capacitors for ICs. However, in the LM35 datasheet I find two different figures: The circuit above I need, since I probably ...
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1k views

Why there are two diodes instead of one used for an LM35 negative temperature circuit?

See the system examples of the LM35 temperature sensor datasheet on page 16, see picture. This should be used for negative temperatures. However, the voltage change is 10 mV/C and it supports -55 C ...
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671 views

Output of LM35 temperature sensor > 3.3 V?

According to the datasheet the maximum rating of the output of an LM35 is 6 V. However, the output should give 10 mV/C and it supports upto 150 C, which results in 10 mV/C * 150 C = 1500 mV which is ...