Questions tagged [temperature]

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

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Total length of cable to connect 1-wire DS18B20 sensors without problem

Based on this topic and the connection that is proposed I would like to make two questions (if somebody has face the same problem/task). So can I connect the data cable to a raspberry GPIO and then ...
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Wiring 4-wire PT1000 to MCP3008

Is it possible to read a 4-wire PT1000 using an MCP3008, which is connected to a Raspberry Pi? I can handle the software part; I am looking for how to wire things up. Is this possible after all? Which ...
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64 views

Wheatstone bridge: Modifications for different temperature sensor resistance

I am trying to build a Wheatstone circuit to detect temperature changes of a low resistance (about 10 ohm) wire. For a first try I would like to use a circuit proposed in this Maxim Application Note ...
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Which sensor should I use to recognize just humans? (not all of the obstacles)

I would like to make a social distance meter and the device should only avoid from humans, not the obstacles. I'll use an ultrasonic sensor and a PIR sensor but I'm not sure it will be enough. Do I ...
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Issue with circuit board implementing temperature circuit

I have not got a lot of experience with PCBs, but I have moved a breadboard circuit to a PCB and I am seeing an issue. The objective of the board is to sense temperature. When the circuit is on the ...
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How to connect 15kΩ NTC thermistor sensor to thermostat which requires 10kΩ NTC thermistor

I have a electric floor heating in my house. Old DEVI thermostat broke down few day ago. Problem is that DEVI thermostats are expensive and a little bit dump (not smart). I want to replace thermostat ...
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1answer
37 views

Calculating maximum permissible track amperage for intrinsic safe PCB

I'm reading IEC 60079-11 standard (Equipment protection by intrinsic safety "i") which discusses how to design intrinsic safe circuit boards. In section 5.6.4 it talks about permissible ...
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47 views

Thermal pads, their thickness and conductivity

I would like fo know how do thermal pads work, more specifically why does their thickness matter so much even more so than their actual conductivity numbers sometimes and how do I choose the proper ...
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52 views

Measuring parallel resistor without current

I am trying to read the temperature sensor in a car with a Raspberry Pi. The temperature sensor's resistance changes as the engine temp increases however the temperature sensor would be in parallel to ...
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What is the absolute maximum temperature of a ceramic capacitor while not operating? (non-operational maximum)

I'm trying to determine the maximum non-operational limits of my system. The operational limits are easy to determine as they are provided in all of the datasheets for each of my components. However, ...
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How can I use a 2N2222 transistor as a temperature sensor?

I'm supposed to use a TMP36 transistor for a class to read the temperature of the environment, but I only have a 2N2222 transistor; the Arduino will have an analog read of it, but the numbers won't ...
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PT100 temperature sensor: meaning of “measuring current” specification

I'm measuring temperature using a PT100 temperature sensor on a Wheatstone bridge. As I'm working on a battery powered application, I'm choosing the resistors in the bridge so that only a small ...
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Maths behing implementing temperature compensation on a signal

I have a fluid pressure sensor (blue line) whose measurements are affected by outdoor temperature (yellow line). So there is a 12 hours cyclic component (day/night) in my pressure measurements. How ...
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1answer
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Measuring Discharge Rate of LiPo battery

I am attempting to change the temperature that a 3.7v rechargeable LiPo Battery is discharged in and am seeing how this affects the capacity and discharge rate of the battery. My setup currently uses ...
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Creating battery pack with biased thermistor resistor network. How to ground if sensing externally

I designed a battery pack board for a customer that uses a multi-cell low-side (NMOS) protection IC. The protection includes OV, UV, OC, and OT/UT protection for the pack. The Overtemp and Undertemp ...
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PTC thermistor vs. NTC thermistor for measuring the temperature of a liquid

I have to measure the temperature of a liquid. Does a PTC thermistor has any advantage over an NTC one? I mean, are there conditions where one is preferred over the other?
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Lead resistance of 3 wire RTD100

I am using a three wire RTD100 as a temperature sensor. I know the advantage of the 3 wire RTD100 is that it gives accurate temperature output by canceling the lead resistance. First the resistance ...
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Temperature sensing with ADS1115

I am using an ADS1115 as an analog to digital converter to measure temperature. I am using an RTD100 temperature sensor to measure a temperature range of -40 to 150 degree celsius but the resistance ...
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1answer
63 views

Understanding Thermal Characteristics for Microchip CL2N3-G Constant Current LED Driver

I'm having trouble interpreting the thermal characteristics of the Microchip CL2N3-G Constant Current LED Driver chip. Here's the datasheet: CL2N3-G Constant Current LED Driver 1 What I want to do is ...
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How to calculate temperature rise of PCB polygon?

I'm designing a PCB where I have a polygon that carries current from one terminal to two pads, each pad should pull 33 Amperes, so a total of 66 Amperes running through that polygon. How can I ...
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UV protection for character LCD

I am using 20X4 character LCD display. Like these: https://www.alibaba.com/product-detail/big-size-20x4-line-white-color_62471561311.html?spm=a2700.pc_countrysearch.main07.78.2bafd2a7u344W2 The ...
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2answers
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Thermistor with sharp “cutoff” edge (reaching around 45°C)? [closed]

Is there a thermistor which has a very low resistance up to about 45°C and then, within a few degrees, raises the resistance to a very high resistance? Sort of like a self resetting thermal cutoff ...
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1answer
97 views

What type of vintage semiconductor device is this? Is it an SCR?

I found this circuit board from an 1980s old humidity controlled chamber. This definitely looks like a temperature regulator of some sort. It has a M logo which means made by Motorola. It has the ...
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Is there a non-contact temperature sensing technology that can measure the temperature of something emersed in water/other liquids?

It's pretty much all said in the title... I want to get the temperature of a surface that my device is moving past. The surface may be as cold as -55°C. I was thinking about non-contact thermometer ...
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81 views

Building a furnace with more than one thermocouple for accurate temperature measurement

I am a mechanical engineering student. I am in the process of making a special purpose heating equipment. It could be considered as a 3 phase electrical resistance furnace. I want the temperature in ...
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3answers
84 views

how to calibrate my multimeter temperature probe

I have a multimeter with the following temperature accuracy for its Type K probe ±3% of reading ±5C The display is in steps of 1C I attempted some calibration: In ...
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87 views

PCB low power self heating component separation

I am an EE that is fresh out of college and and starting at a smaller company, and I have a question about electronic self heating, and how to keep heat from spreading in a PCB to heat sensitive ...
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1answer
62 views

What does it mean 'package limitation current' on a MOSFET datasheet?

I was looking at the datasheet for IRF1405 and got really excited when I saw 169A @ 25C! Then I started scrolling down and it says 'package limitation current is 75A'. Does that mean the maximum ...
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793 views

Effect of length on a thermocouple's accuracy

I'm a mechanical engineer working on acquiring some temperature data using thermocouples. Q. I wanted to know the effect of wire length on a thermocouple's accuracy. I don't have much of electrical ...
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2answers
93 views

heat sink solution for light source around 1000°C

I'm going to use a infrared light source IR12k which can reach 975°C for my design. However, I'm not sure whether I can solder this light source with cable whose other end is soldered with power board....
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Theoretical question: Could an incandescent light bulb be used as a temperature sensor?

Let's assume a plain old incandescent light bulb. It runs on a fixed (assuming an ideal supply grid) voltage and will regulate the current going through it as its resistance raises with the ...
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100 views

Why is the MCP23S17 device getting too much hot suddenly and randomly Raspb 4A?

Circuit is a Raspberry Pi 4A SPI master node talking with one MCP23S17 device: datasheet. I'm testing the singlest circuit version in a protoboard. We are using A bank GPIOs for reading, and B bank ...
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42 views

Is it okay to leave regulators heating at higher end of range of operating range?

IC operating range -20 to 80 degrees Celsius Regulator IC application spec 12V in, 5V 1.5A output Is it okay to keep IC running at 70-75 degree Celsius (with heat sink) all the time, circuit will be ...
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1answer
48 views

Help for checking if PID code

I am designing a PID temperature controler; as far as I managed to write it so far, you find the code below. Can you please help me check if Integrator wind up and other PID elements are configured ...
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91 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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45 views

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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47 views

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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1answer
31 views

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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93 views

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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74 views

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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3answers
53 views

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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68 views

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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2answers
130 views

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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52 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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