Questions tagged [temperature]

Temperature is a property of a substance related to the amount of heat energy it contains.

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69 views

What sensor used in all non-contact body temperature guns?

With the whole COVID thing happening, there has been a proliferation of these handheld guns on the market. I have been struggling to find out what kind of sensor is actually commonly used in these. ...
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Sensors - How to convert 4-20mA output to temperature and pressure values?

I'm dealing for the first time with two sensors, of pressure and temperature. Both have output of 4-20mA, then I'm using a 47 ohms 1% to convert to voltage. When flows 20mA, 20mA * 47 ohms = 940mV, ...
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TMP36 changing values so much

I am using a TMP36 and an Arduino (like shown in the diagram below) to measure temperature. The temperature sensor sensor is changing values abruptly. It looks like there is an error. Can you please ...
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Calculate the Thermal Resistance (Junction to ambient) from Thermal Resistance (Junction to mounting base)

I have this MOSFET - MOSFET Datasheet I want to calculate the maximum junction temperature of the MOSFET part. I have calculated the power dissipation. In the MOSFET datasheet, there is only Thermal ...
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How do I accurately measure the B value of an NTC thermistor?

I'm trying to find a part number for an NTC thermistor being used to monitor the temperature of a rechargeable battery. The thermistor I have has no color markings or numbers to indicate any ...
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Why are thin-film surface-mount resistors particularly suitable for use in cryogenic environments/conditions?

I am currently studying The Art of Electronics, third edition, by Horowitz and Hill. Appendix C.4 Resistor types says the following: The usual choices for general-purpose use are metal-film (axial-...
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38 views

What kind of temperature sensor to use?

I want to make a case for a FPGA eval board and wanted to monitor the temperature inside to start a fan if the temperature exceeds a certain value. What kind of sensor is best suited for this task in ...
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What kind of camera could work inside a microwave?

I want to record video inside a microwave, is it possible? What if it was hid behind a shield or the same galvanized material as the door? The detailed structure may completely ruin visibility tho
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Need help on building a passive Dim-to-Warm LED array

I have started a project for my home lighting, I'm trying to build a DC LED module which would change the color temperature from 3000K to 1800K as dimmed with reducing current. I'd like to do it ...
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TMP36 sensor temperature spiked to 200+ (actual temperature of the component)

I've been learning Arduino and playing with the TMP36 sensor, trying to read temperature of my room. To do that I've assembled a super-easy scheme just to read the values to Serial monitor, something ...
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Thermal camera reference device

I'm trying to find a device that can act as a reference for a thermal camera, but everything I find is always some tens-of-thousands-of-dollars blackbody device that is accurate to within 0.01 K. I ...
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Will the temperature of a resistor converge to a predetermined value assuming ideal conditions?

This is a two-part question I haven't been able to get off my mind: Given a resistor in a vacuum chamber (to ideally eliminate heat loss due to air), assume you apply a constant voltage across it. ...
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What is the difference between operating temperature and junction temperature of an IC?

On Wikipedia, I found that these are the same. However, in datasheets I find two different temperature ranges. Can somone explain the difference to me please?
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How is a four terminal sensing compensating conductor resistances?

A four terminal sensing is used to compensate the resistances of the conductions. Why is that as I even use more conductions than in a two terminal sensing? The current from the current source will ...
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What technology do IR temperature guns use?

I've seen contactless thermometer guns for sale for ~£40-50, which can read temperatures up to 1000°C. However, the only electronics components I can find which can measure these temperatures without ...
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48 views

Temperature of Power Driver ICs

I'm using TI DRV595 power driver in an application requiring several amperes of current. My observation using thermal camera has been that at 3.5 A the driver IC core reaches temperatures around 90 ...
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What does ST mean with “Temperature Offset” for the temperature sensor in their IMUs?

When reading the datasheet of the LSM6DSO32 IMU I noticed on p. 29 the characteristics of the integrated temperature sensor (see screenshot below): The sensor gives a digital reading of 0 for a ...
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Why don't electronic thermometer “move back”?

I have noticed since a long time that electronic thermometers, which use a temperature sensor at their tip to measure temperature, only move forwards, i.e., their reading only increases as they ...
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Replace Thermistor with Thermocouple in a circuit

I had a simple temperature controlling relay board (Novus N321). It would open or close a circuit powering a heater based on the reading of a thermocouple, versus a set value. The circuit is now ...
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Needed help in finding temperature of wire

How can I calculate the temperature of a heating ni-chrome wire given the following: length = 0.3m resistivity = 1.1*10power_6 ohm meter gauge of nichrome wire = 18 power given = 12V, 400W DC current ...
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36 views

Calbration of an infrared sensor

I found on a site that it is important to know the temperature of the infrared sensor while calibrating the infra red sensor, but I could not find the real reason behind this. Anyone knows it?
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Temperature degradation of ferrite cores

While building smps halfbridge (old ATX similar) recently I went to a problem: When I use working transformer as a base drive one - it works good, but when I heat it up, unwind, and wind the same - it ...
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28 views

Infrared temperature sensor

I'm trying to build (starting from scratch) an infrared temperature sensor. I don't want to use Arduino or similar, instead, I chose to use the ATSAMV70Q20. I've never built any sensor (I'm doing this ...
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Is there a method to know the temperature value of a microcontroller? [closed]

I want to know if there is a method to know the temperature of the microcontroller to avoid its over heat.
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Are there any contactless IR temperature sensors availbe for a range above 380C? [closed]

I need to measure the temperature of something without contact as part of an embedded electronics project (this sort of form factor would be ideal), and need a range up to 500C. There are IR guns (for ...
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254 views

Arduino PID temperature controller

I am running the below code on an Arduino Uno and it is partially working. I will try to explain the problem step by step: I start the soldering station from AC 230V The soldering station heats up ...
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1answer
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what is the difference between ambient temperature and object temperature in MLX90614 sensor

So, that i have read a source code of MLX90614 sensor. In the source code they have mentioned that ambient temperature and object temperature.as well the sensor which is used for measure the ...
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MOSFET driver is running hot

I've built a simple circuit to test a combo of a MOSFET (SUP70030E) and a gate driver (TC4452): The MOSFET should be compatible with the gate driver (if I'm not reading the datasheets wrong) and the ...
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1answer
85 views

Why do bare die chips (MOSFET) have a maximum storage temperature?

As far as I understand, a chip in general and a MOSFET in particular has a maximum operating temperature (let‘s say 125 °C or 150 °C for Si) because above that temperature the risk increases of ...
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Express reverse diode voltage drop as a function of temperature

I've made a simple temperature meter, with means of series of Ge diodes, followed by 10k resistor. I am applying +5V to topmost diode cathode, and measuring voltage drop between resistor and ground ...
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Problem calculating winding temperature in a brushed DC motor

I'm building a rig for measuring pull out torque for stepper motors, and am looking at dynamic braking and plugging of a permanent magnet DC motor which will be used to apply a variable braking torque....
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28 views

Electronic device operating temperature declaration

How is device operating temperature range determined? I supposed that for a specified temperature range all the built in components have to support it. I am in doubt because I saw some commercial ...
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Can I build a 4A circuit on cardboard?

I'm planning to build a 12V 4A circuit, and I was originally going to put it on a strip board. However, the board I ordered came broken (and each piece would be a bit small for building a circuit), ...
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Converting opamp output

I want to measure the temperature with PT100. At the first stage the resistance is converted to voltage (ca in range 1.5-2 V for 0°C 100°C). How can i scale this voltage to range 0-3.3V with the ...
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Unified struct in C to represent multiple sensor data

Working on desginging APIs for sensor events. I was wondering if there is a way to represent different type of sensor readings into a unified struct in C ? For example a accelerometer'e reading ...
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IC Supply Current vs Temperature at low temperature

Background I am designing a low power device where every uA counts. It has a temperature range from -25C - 35C. In the datasheet for the 74AHC1G66; 74AHCT1G66, an analog switch I'm looking at, on ...
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62 views

Heating Nichrome wire to 65°C

So I want to provide some heating to what will be like a fibreglass bucket and am contemplating adding some nichrome wire between a couple of the layers of fibreglass mat. I would ideally like to ...
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Input impedance of load cell CZL635 seems wrong

I'm working with load cell Phidget CZL635 and HX711 ADC in order to make a weight scale. Load cell: https://www.gotronic.fr/pj-461.pdf ADC: https://pdf1.alldatasheet.com/datasheet-pdf/view/1132222/...
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Maximum temperature of an electric motor and proper cooling system

I have found an electric motor in my home and I want to estimate how much time it can operate until its temperature becomes too high and eventually build a cooling system for it (I have seen that ...
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1answer
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How do I interpret the zero-g level change vs temperature specification for this accelerometer?

This is an extract from the datasheet of the MPU6050 sensor. I was expecting the level change vs temperature to be in units of mg/oC. Instead, as you can see, the temperature range is specified ...
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STM32 ADC read temperature channel rarely between timer triggered conversions of regular channel

I am using a timer to trigger conversions of the ADC. The DMA writes the conversion results to a buffer of 512 uint16_t. When the buffer is full, an interrupt is triggered and I restart the conversion ...
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2answers
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Rated power vs. temperature for resistors

As you know, there is a Rated power vs temperature curve for resistors in datasheets like the image below. For DC inputs, I think everything is clear about power. My question is that for pulse inputs,...
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78 views

Safety switch to latch when power turns off till reset

So I currently have a drive run by a PSU. I have a thermal controller that will cut power to the drive when it runs over temperature but it doesn't latch off, so as soon as the drive cools a little it ...
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54 views

Voltage of thermocouple

As we know, when we use a thermocouple, we measure mV value. This is what I wonder. Why we measure voltage not current? Like voltage, I think the current of T/C is proportional to temperature too.
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Splitting/y'ing a thermocouple amongst 2+ inputs

The system in question has just one type K thermocouple. Is it a bad practice to Y a thermocouple into 2+ thermocouple inputs? For example, Y a thermocouple into: DAC thermocouple input card Limit ...
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Temperature Sensing and board heat

My goal is to have an accurate measurement of the current temperature in my room, which I will use for a thermostat. The problem I have is I bought this breakout board and soldered it to about 5cm ...
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NTC Thermistor Trigger LED

I'm wondering if anyone would be willing to help me with the basics here. I'd like to create a circuit, as small and simple as possible, with off-the-shelf components, that will allow me to turn on an ...
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Building Temperature Control for Cotton Candy Machine

I want to build a temperature controller for a cotton candy machine. The model I have is: Carnival King Cotton Candy Machine I was thinking about building a PID control circuit with an SSR but ...
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Advice on connecting heater directly to SP2 relay of PID controller?

I have an old Omega CN-9121 PID Controller and a 105Watts 115V Fibre heater mantle with an inbuilt K-type CHromel-Alumel temperature thermocouple also attached into it. I plan to use the PID ...
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164 views

How to mount TO-92 package on a heatsink?

I want to measure heatsink temperature using LM35 TO-92 package. heatsink is a flat surface of aluminum. What is the proper way of mounting a TO-92 temperature sensor on a heatsink so that can ...

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