Questions tagged [temperature]

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

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26 views

Is this circuit ok for MCP9700 temp sensor?

I am trying to use multiple MCP9700 temperature sensors and probe certain power IC heatsinks for sensing the temperature through an attiny85. I have two parts in the overall schematic. For each ...
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MLX90632 eeprom write problem

I am using an MLX90632 (MLX90632-S-LD-BCB-000) infrared temperature sensor to build an application which reads an object's temperature among other things. MLX90632 manual The MLX90632 comes with a ...
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Read Data from Temperature Controller using MATLAB, Need Help

I am trying to read data from a temperature controller called ATR-401 using MATLAB's tool box called Instrument Control Toolbox but every time i try to read data from it i get an error "A timeout ...
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124 views

Very high temperature (>500C) IC packages

I was looking for IC packages where I can mount a small wafer (3mmx3mm) wire bond to the leads of the package and conduct operation at 500C. I have contacted couple of companies which do ceramic IC ...
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20 views

Smart High and Low Side Mosfet

For example I have two smart high or low side mosfet that have 4 channel. One high side driver has 1 amper per channel. Other high side has 2 amper per channel. I tested these smart high side mosfet ...
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53 views

ATMega328P - DS18B20 temperature sensor returns incorrect temperature values

I'm using a Dallas DS18B20 sensor to measure temperature in conjunction with an AVR ATMega328P microcontroller (using this AVR C library to implement the code). Unfortunately, the value always returns ...
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90 views

How can I decide relay on-off periods depending on the PID output [closed]

In my PID project, I am using discrete time PID formula as follows. u(k)=u(k-1)+Kc * [(e(k) – e(k-1)) + (Ts*e(k))/Ti + Td/Ts * (e(k) – 2*e(k-1) + e(k-2)) As you know PID output increases over time ...
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STM32H7 on-chip temperature sensor reading stable on 'Y' revision, but unstable on 'V' revision chip

using the STM32H753VIT6, I like to monitor the on-chip temperature sensor. The environmental temperature can become about 50 degrees Celsius, and the board is housed is a small plastic (DIN-rail) ...
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121 views

Which one of these DS18B20 temperature sensors is fake?

A while back I bought two DS18B20 for half price, and today I bought another one for double the price. The part number on the cheaper one is printed while on the expensive one it's laser etched: On ...
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81 views

How to calculate temperature in Wire?

Let's say I have 1m of 2,5mm² copper wire, insulated with H07V-K. The wire carries 40A and environment temperature is 25°C. The wire is suspended in free air. How hot will the wire get? And how can I ...
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36 views

Relay coil inductance variations vs. temperature

How does relay (something like this https://www.hobbytronics.co.uk/datasheets/songle-12v-relay.pdf) coil inductance changes with increasing/decreasing temperature? And how can we calculate the new ...
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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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106 views

How to turn on LED with temperature sensor

I'm new to electronics and I want to control a device using a temperature as an input. Right now I saw this video on youtube and want to follow it as well as know what the components are for. https:/...
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1answer
33 views

Connecting K-Type Thermocouple wires to a data logger with a male and female plug

I'm trying to setup a temperature data logger using Graphtec GL240. I will be using K-type thermocouples for the logger. I want to run short length of k type cables from the logger to a female K type ...
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52 views

Need help in cable temperature calculations

I am trying to calculate how hot will a 0.6m long 28AWG wire carrying a load of 12VDC, 0.2A get. I understand that are other factors such as environment cooling rate, thermal resistance between air ...
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1answer
60 views

How bad are 3 degrees Celsius for a lithium battery and electronics?

I have a PCB powered by a lithium battery , it works well inside the house, but when I leave it exposed to low temperatures with humidity the PCB or the battery stops working. I leave the PCB in the ...
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37 views

How to convert a temperature readout to a K-type thermocouple voltage? (reverse thermocouple converter)

I am working with a commercial heating controller device which takes in a thermocouple input in order to regulate the heating temperature. However, in some cases, the thermocouple junction just isn't ...
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1answer
37 views

DIP temperature Sensor with serial port [closed]

I am looking for a temperature sensor which is in for of DIP suitable for breadboards and serial communication that is usable for Arduino. I am not after a resistive or an analogue sensor. I am not ...
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1answer
32 views

Need advice choosing wiring configuration for combination pressure and temperature sensor

I am currently trying to purchase a combination temperature and pressure transmitter for a project, and it has an option to choose between a 3 wire or a 4 wire configuration. I have attached the link ...
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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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51 views

Stable current source with discrete components

The purpose of this is to compare and learn different circuit topologies, not use of the shelf solutions which obviously provide cheaper, simpler and better results. Considering this requirement (no ...
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37 views

Cooling Peltier Maths

I want to construct a peltier cooling system. However, I have limited mathematical skills. Can I ask how to do the maths to calculate how much temperature differential can a specific peltier cool ...
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1answer
60 views

Water-Based Heat Sink

I am trying to incorporate a TEC in a portable system. The heat from the interior of the system needs to be transfered to the exterior where it can be dissipated freely into the environment. Now, I ...
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1answer
38 views

Circuit thermal analysis in PSPICE and temperature coefficients

I am tying to perform a thermal analysis in pspice. Resistors needs two temperature coefficients as TC1 and TC2 (if we assume linear change of R vs. T, it's zero) in pspice. But in resistor datasheets ...
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Help for design simple heating circuit using Temperature controller MH1210W

I have to warm at 33-37 Celsius degree a small wood box , volume 600 x500 x800 mm placed at 25 Celsius degree. For maintain this interval 33-37 Celsius degree - I can use Temperature controller ...
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36 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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272 views

What is reasoning behind the common wisdom of limiting the temperature rise of a PCB trace to 5/10/20°C?

When deciding on the trace thickness required to carry a certain amount of current on a PCB, the answer depends on how much temperature rise you are willing to accept. This leads the designer into the ...
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1answer
31 views

Eliminate external pin in SPICE netlist

I'm working with a SPICE model of a MOSFET that provides a fourth pin for setting the device temperature (driving the pin with a voltage in simulation sets the temperature). However, I don't plan on ...
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43 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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73 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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3answers
107 views

How to set the sampling frequency for this filter+

I need to make a passive LP anti-aliasing filter(recommended cut off freq.). Filtered signal from an hotwire-anemometer will be measured by DAQ has 100Meg input impedance. The thing is that my ...
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46 views

How to correct/adjust floor temperature sensor resistance to account for calibration error?

I have a heating system with 10kohm floor temperature sensor cable connected to controller unit. The controller displays floor temperature around 7.0 degC higher than reality, the sensor is installed ...
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66 views

A very basic question about response time of an instrument

Regarding a temperature transducer, what is meant by response time in this context? It says it can be set to < 30 ms or < 300 ms. Is there any trade of between choosing low or high response time?...
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42 views

Drift in high resolution temperature measurement

For a calorimetry project, a precision temperature measurement (0.001 K resolution in the range of 15-25 °C) is required. Note that the absolute temperature accuracy is secondary, crucial is the ...
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1answer
34 views

Connecting a standalone temperature probe to a Raspberry Pi [closed]

I have a standalone temperature probe. I have also a raspberry pi. I would like to get the data from the temperature probe to the pi. I have thought about cutting the probe and using direct but ...
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3answers
129 views

Low temperature batteries for use in Arctic

I've been checking the forum and Google but still haven't got precise solution to my current question. In short, we are looking for rechargable batteries for Arduino that survive under -40 Celcius ...
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3answers
109 views

LM317 temperature [duplicate]

I recently bought this LM317, and I connect it with resistances in order to get 4.2 V: LCSC LM317 clone product page The problem is when I connect it with a 12 V 500 mA power supply it gets extremely ...
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2answers
67 views

Zener temperature derating

Can someone explain what the Ta line on this zener diode temperature derating graph means please. The diode is an MCC SMBJ5338B 5.1V 5W zener. I understand the lead temperature (TL) line means ...
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81 views

Fastest temperature sensor for a bimetallic strip

What is the best approach or sensor to analyze the temperature of a bimetallic strip? From experimental data, the temperature swings due to a current flowing into the bimetal, are up to 80°C in a ...
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234 views

Reduce impedance for power traces of a decoupling Cap when ground planes are not directly under

I am using an SHTC3 temp and humid sensor to send readings using I2C lines to the MCU. Based on the datasheet for SHTC3 to make sure the sensor is reading ambient temp without the interference of the ...
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3answers
63 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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1answer
106 views

Temperature Limits of an E ink Display?

I'm playing around with E-ink displays and I have a project in mind that would have to subject the display to extremely high temperatures (around 110 degrees Celsius). The display does not have to be ...
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950 views

LM317 - Calculate dissipation due to voltage drop

If I use a linear voltage regulator as LM317: Input voltage = 24 V Output voltage = 5 V (so a voltage drop of 19 V) Mean load = 480 mA (peak load = 700 mA) From the datasheet, I read that maximum ...
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Can't import my .sof file to my FPGA

i am new to the whole VHDL/FPGA thing, and i am trying to import a simple AND gate to my FPGA, but i get the failed message everytime, any idea how to fix it? P.S : For some reason the device it ...
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2answers
101 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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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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132 views

What is meant by derating in this context?

At page 33 of this motor driver there is a section includes the term derating due to temperature: What is meant by continuous current derating 4% per Kelvin in this context? Does that mean the motor ...
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2answers
101 views

Waterproofing products

does anyone know of a product that can be used for waterproofing electronics and exposed wireing that is suitable for submersion for potentially long periods? More specifically I am looking for a way ...
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2answers
433 views

Crystal compensation for temp and voltage

Introduction I'm toying with the design for a fail-safe wall clock controlled by multiple 32.768kHz crystal oscillators. I'm currently reading about compensation. Compensator from literature From ...
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1answer
51 views

PT100 - 39250 Cubic fit formula

I'm currently using a cubic fit formula I found online to derive the temperature of a PT100/385 RTD using resistance. The formula is -247.29 + 2.3992*R + 0.00063962 *R^2 + 0.0000010241 *R^3 where R is ...