Questions tagged [temperature]

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

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High temperature reading of mechanically-separated body

I have a device with 2 mechanical parts. One side is stationary and can be connected to an electronic circuit with power. The second side is an enclosure that can have high ambient temperature (100-...
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1answer
223 views

Estimate temperature for silicon (p-n junction)

I need to estimate the temperature at which p-n junction made of silicon lose it rectifying characteristics. (\$N_A=N_D=10^{15}\,cm^{-3}\$) \$E_G\$ is independent of the temperature and are 1.12 eV ...
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Have I got a dodgy batch of TMP36 sensors

I bought some TMP36 sensors from Amazon.co.uk for a small project (ESP8266 NodeMCU temp sensors) and have struggled to get sensible output from them I have tried reading them from A0 on the ESP8266 ...
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39 views

Transmission distance with AM2320 temperature and humidity sensor

I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
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1answer
48 views

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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0answers
40 views

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 ...
2
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0answers
48 views

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 ...
2
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1answer
212 views

Does the load at where Pmp of a solar panel is oberved change with temperature?

After reading up on solar panels, I know that the max power that a Solar panel can supply (\$P_{mp}\$) will drop as the temperature increases. The \$V_{oc}\$ will decrease a lot more than \$I_{sc}\$ ...
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0answers
91 views

Calculate the junction temperature of a MOSFET during pulse

Hi all I have a question regarding using a MOSFET for a constant current source. I have found this question with some answers but it wasn't clear to me yet. I want to create a constant current LED ...
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0answers
153 views

Why does my SEPIC converter output more power at higher temperatures? What are the implications of this behavior?

I have a Pololu S18V20ALV SEPIC voltage regulator board that is wired to a high-amperage 5V USB power source on the input and a DC brushless fan on the output. The output is set to about 5.5V. ...
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0answers
926 views

What is the accuracy of a thermocouple after calibration?

I'd like to use a thermocouple to create a general-purpose temperature probe. However, the accuracy is quite a bit lower than I want. Almost every source I look at (example) lists the accuracy of a ...
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38 views

How can I turn off a MOSFET when the temperature rises?

I am using a MOSFET as a pre-regulator. When the voltage is too high, the temperature of the MOSFET is getting too high. (Even if I take 15 mA current.) As a safety precaution, if the junction ...
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0answers
71 views

Temperature rise in the inductor?

I have a customized inductor which is of E70 core. I would like to calculate the temperature rise in the inductor. Ac copper loss= 5W, DC copper loss 2.5W, core loss 8W (according to steinmetz). I ...
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0answers
46 views

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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62 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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30 views

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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38 views

Will the resistance of the certain valued resistor decrease or increase at cryogenic temperature?

I tried to measure resistance of 332k Ω while dipping in liquid Nitrogen (cryogenic temperature) I got the resistance value near about 458k Ω, doesn't it contradicting "Resistance should increase and ...
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44 views

Board is getting reset when I lower the temperature in Thermal Chamber

I have a board which I put in the thermal chamber. I increase the temperature inside the thermal chamber to 85degC. Soak it for 2 hours and note some readings. Then, when I change the temperature to ...
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0answers
59 views

Multiple temperature sensors - One output

I'm a plumber and I'm not able to find a commercial product that fits my needs, so I'm wondering if it would be feasible to build it from scratch... I'm familiar with basic understanding of electronic ...
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107 views

Temperature vs. lifespan: the 10 degrees Celsius 'rule'

TL;DR: What's the origin of the 10 degrees Celsius rule? I have heard many times that for every 10 degrees Celsius, the lifespan of components gets halved. There are many documents on the web quoting ...
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27 views

Heat transfer coefficient in a Module Baseplate

Today, for example in a power IGBT module cooled by a heatsink, it has been found that the heat transfer coefficient (htc) distribution may not be uniform across the bottom surface of the module ...
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1answer
203 views

Help with wiring a temperature controller and a solid state relay

I have a problem that's probably patently obvious to someone in the know but alas, that's not me. Long and short- I have a 240v heating table (aluminum table with silicone heating pads underneath) ...
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108 views

IC forces <260℃ solder temperature; socket needed?

For a school project, we are using LN324-N OP-amps packed in a DIP. Specs can be found here. We need to solder these to a PCB board. However, section 6.1 of the specsheet says: Lead Temperature (...
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32 views

Magnetic Field Strength Measurement at Extreme Temperatures

Hi I have just been given a project at work and we are magnetically stress testing DUTs at extreme temperatures going from -40 Degrees Celsius to 200 Degrees Celsius, I need to come up with a way that ...
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0answers
94 views

PID neural network temperature inertia

I am using a PID Neural Network (PIDNN) algorithm to control a multi-zoned temperature hardware. The aim of the algorithm is to minimize the error with the Backpropagation rule and weights updating. ...
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0answers
1k views

Soldering sheet busbars to PCB concerns

Hello fellow engineers I have decided to solder busbars to a high current pcb , but i have 2 concerns : Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
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292 views

MSP430G2553 Reading from ADC10 Temperature with Button ISR

This is my lab assignment. When I press the button, the red LED toggles on and off. But, I can't seem to read anything from it. Also, there's an empty loop in the code, but I don't know what to insert ...
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186 views

What are the materials needed for boiling milk alarm sensor?

I have recently bought raspberry pi to start working on it. I have never ever used it before. I am thinking of doing very basic task of led bulb on/off for getting into it. I am curious on developing ...
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2answers
241 views

ADC variable reference voltage

I'm working on a design which must read temperature using RTD pt100 with at least 0.5 degree Celsius accuracy in the range -10 to 50 degrees . I want to use AD7705 ADC. my design looks like this. I ...
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0answers
2k views

How can the temperature drift in this unusual absorption detector be reduced?

I am using this simple circuit in a sensitive hand-held probe to detect metals in the ground. It works very well except for the temperature drift. The drift means having to often re-adjust P1+P2, ...
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481 views

NTC Thermistor selection for high temperature where beta value needs to be > 22000

We would really appreciate some help with finding a thermistor (and accompanying resistors) in order to do some current limiting in high-ambient temperatures. The circuit comes from the LT3741 ...
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148 views

PID tuning single input two output with changing setpoint

I am operating the process in the image below, where I am using a recirculating heated/cooled bath (RHCB) (Polystat 12122-56) that externally circulates hot water through a heat exchanger (HX) and ...
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130 views

MAXIM31855T thermocouple chip, is there a through hole equivalent that works on the spi bus, having problems with SMD routing

I need to produce a circuit board to measure 16 temperatures from different thermocouples of types J and T, Maxim has the perfect chip, the MAX31855(T,J), the only problem is that it is surface mount ...
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101 views

Relation between Digital frequency counter and temperature

This is a homework question, I can normally solve the problems on freqeuncy counter but I never did with temperature related frequency counter problems. A digital frequency counter has these ...
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0answers
618 views

Arduino building a pulse proportional thermostat

I'm not much of an engineer, but I have worked with arduino. I'm looking to see if it's possible to build a pulse proportional thermostat with a probe and an arduino. Any recommendations on where to ...
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59 views

Which is more robust against temperature cycles, solder or wire wrap?

When connecting a bunch of components in something that will be subject to repeated heating and cooling, are soldered joints likely to be more or less robust than wire wrap? Intuitively, it feels like ...
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1answer
52 views

12V 4-pin Noctua NF-A8 on Raspberry Pi 4B

I am using a 12V 4-pin Noctua NF-A8 fan https://noctua.at/en/nf-a8-pwm and want to use the PWM functionality also read the rpm from it. Firstly, I went over dozens of forum discussions on a 5V 4-pin ...
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1answer
35 views

How does series parallel combination of LEDs affect the temperature rise?

I was designing the LED light of 200 W with LED combination of 9 series / 8 parallel, each LED is 6V thus total output voltage is 56V. I am using Meanwell xlg 200 W driver. But this resulted in high ...
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0answers
43 views

How do I calculate the temperature rise in the ferrite core?

This question might seem basic but I would like to state it. I would like to calculate the operating/Rise temperature of the ferrite core of an inductor. I am modelling my own bobbins for the core so ...
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0answers
36 views

Temperature rising for inductors

I have an U type inductor. I'd like to calculate temperature rising on the inductor. I found a formula but the result was approximatly 350-550 celcius, I think that is not possible. Here my formula: $$...
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68 views

I made a temperature controller - the PID works but the heater still doesn't work

The setpoint doesn't affect the output voltage to heater. How can I fix my circuit so current goes through to the heater?
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1answer
33 views

Derivation of formula for temperature coefficient of resistance

https://www.electrical4u.com/temperature-coefficient-of-resistance/ Referring to this article, I'd like to compile two key formulas for the temperature coefficient of resistance. First is the formula ...
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1answer
37 views

How can I calculate the worst-case Tj of a MOSFET in discontinuous operation at another Tamb?

I am faced with the task to calculate the maximum junction temperature of a MOSFET in a half-bridge, having conduction losses, switching losses and diode losses. The real difficulty comes from the ...
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1answer
59 views

PID controller for a very wide temperature range (∆T=190°C)

I'm designing temperature control system based on Peltier elements. And it's needed to work on a very wide temperature range - from below zero to more than 100°C. So there is two work modes - cooling ...
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0answers
25 views

How to use temperature formula of SI7021 using MS LS recieved

SI7021 datasheet. This is the data in ASCII I recieve to my serial communication in Matlab. The first letter is the ASCII for the MS byte, the second is ASCII for the LS byte, then we have the ...
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What is the impact of a lower TG for an RF Board?

I have a board that contains a WiFi module (2.4GHz). Does Tg have an effect on RF performance in any way ? If the material can satisfy the other constraints, such as Dk, Df etc.. would the Tg be a ...
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52 views

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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63 views

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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1answer
132 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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1answer
46 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 ...