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

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Marlin temperature update frequency 3Dprinter

I would like to know at what frequency is the temperature information pulled by the marlin software. I have looked into the code but it insn't obvious to me.
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1answer
64 views

Reasons to use an analog temperature sensor instead of a digital one

I'm designing a microcontroller-based system that includes a thermostat. When choosing which temperature sensor to use, I noticed that analog ones have more or less the same power consumption, the ...
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1answer
65 views

Why we put 10Kohm resistor in parallel with 144Kohm that exist inside USB-6008? [closed]

By using LM35 Temperature sensor and USB-6008 a 10Kohm resistor is placed between GND and AI0 and connected to LM35 with a wire to GND and Vout respectively. By refer to Analog Input circuitry in ...
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2answers
79 views

How to maximize microcontroller temperature?

I need to test how hot a specific microcontroller can get in different situations. The goal is to have the microcontroller heat up as much as possible just by using it. I was thinking I'd need to ...
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1answer
19 views

Sensor Performance Analysis

I've recently built a temperature sensor and have been testing it against a reference thermometer in several different scenarios/environments/temperature ranges. My question is, how do I analyse my ...
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6answers
1k views

Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...
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2answers
96 views

What resistor values should I use for a voltage divider that has to operate at low temperatures?

I'm designing a flight computer for a lightweight pico balloon - it will (hopefully) operate in the upper atmosphere down to around -40C. To keep the weight down, the whole thing is going to be ...
6
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1answer
77 views

How to change the temperature of sub-circuits in LTSPICE

I have subcircuits of a solar cell (resistors and diodes) in LTSPICE. I want to connect the solar cells (sub-circuits) together. However, each solar cell has a different temperature. I can set the ...
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14 views

Orcad PSPICE Temperature Sweep

I have built a multivibrator oscillator using an op amp circuit (similar to a 555 timer approach) in PSPICE. The output is correct so the entire circuit is functionally working. I am trying to see ...
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1answer
45 views

Simulating a Constant Temperature Anemometer

I am trying to simulate the results I see when using a constant temperature anemometer circuit to sense air flow. An excellent discussion can be found: arduino thermal anemometer. Here is my ...
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1answer
188 views

Circuit reliability, especially tin solder, under wide temperature range -40 degree to +85 degree

We are trying to have our Lab product work in industry environment. One key factor we are thinking about is the operating temperature, since we have never done any environment test before. Our ...
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2answers
64 views

Voltage regulator current and heating

Many texts I read take (Vin - Vout)*Iload i.e the current Iload is I3 in the below figure when calculating temperature of a regulator: But I3 is not exactly same with I1 there is something called ...
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37 views

Measuring the temperature of copper wire

I'm doing an experiment with copper wire, and I need to be able to measure the temperature of the wire. I've looked into temperature sensors and infrared thermometers, but I'm not sure how to ...
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2answers
47 views

MAX7221 experiencing 40C temperature rise above ambient

Each MAX7221 (2) in my current design is getting very hot. I used the FLIR One to get a general measurement. I observed a 40C rise above ambient. I'm not sure what the root cause is. Perhaps ...
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1answer
22 views

When using conventional means to control a heating element, how does it affect the peak required VA?

This question is similar to two others, here and here, but with a small difference. To allow a bit of context: Suppose I have a winters day with lots of sunshine. I have an off-grid PV system, and ...
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2answers
110 views

Atmels AtSAM3s gets a bit warm running a test code on my dev board. Is there a problem?

I have a dev board developed by myself. I was using At91SAM7S256 but now I'm migrating to it's successor ATSAM3S8B. The MCU on the dev board for SAM3S gets warm. I am searching for someone with ...
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2answers
174 views

Micro-controller failure problem as the temperature raises

I'm using at91sam3s8b(cortex-M3) for my project.The hardware board connects to PC using USB port. The firmware contains some cryptographic algorithms (it includes shifts, Xors, memory substitution ...
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3answers
53 views

MOSFET Drain-to-Source Leakage Current over voltage and temperature

I'd like to know what's the characteristic curve of Idss in N-Channel MOSFET transistors over different Vds values at high temperature. As I've checked datasheets (like Fairchild's 2N7000 or ...
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1answer
119 views

AD620 in Proteus: timestep too small

I've made this circuit in Proteus, as a part of a practice report: In real life it works, as I built and tested it. But in Proteus, when I want to run the simulation, I get these errors: ...
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45 views

LM35 and OA741 to measure temperature

I am following this tutorial. http://8051funkey.blogspot.com/2014/08/temperature-sensor-using-741-opamp-lm35.html?m=1 It isn't quite working. My circuit always show the red light. My question is how ...
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0answers
42 views

AM2302/DHT22 outputs strange values

I bought a couple of AM2302/DHT22 (temperature and humidity) sensors, which should have an adequate accuracy (2-5%RH and 0.5°C). After testing them indoors for a while now, I am quite disappointed, as ...
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1answer
61 views

What is an acceptable temperature rise for a Mosfet?

I will be using driving N-channel Mosfets with 5v PWM to switch 24v 2A(per channel) LED strips. I will use four per strip (RGBW) and have 6 strips, totalling 24 Mosfets on the PCB. I am looking at ...
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5answers
2k views

Electronics in high temperature - operating 30 mins - 2 hours, up to 500 °F - possible?

Would electronics survive if the ambient temperature of the environment was between 120 °C (250 °F) and 260 °C (500 °F) and the operating time was between 30 minutes and ...
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4answers
86 views

What is more accurate, thermistor's R-T table or Steinhart-Hart equation?

If I want the conversion of thermistor's resistance to temperature to be as accurate as possible, should I refer to a table or use the Steinhart-Hart Equation? I am in doubt because a table contains ...
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2answers
44 views

How to determine temperature with LSM303DLHC

I am using a LSM303DLHC and am very confident I have the I2C communication working well. I am now trying to use the devices 12 bit temperature sensor. The datasheet is not clear and the tech ...
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1answer
75 views

MOSFET power dissipation calculations - Diodes Inc. datasheets

Looking at Diodes Inc. datasheets, I am having trouble following their power dissipation limit calculations for their MOSFETS. E.g. for DMG4496SSS http://www.diodes.com/_files/datasheets/ds32048.pdf ...
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1answer
33 views

L293DD overtemperature protection

I am using an L293DD Dual H-Bridge IC to power my DC motors. I have realized I am using inadequate heatsinks, and 1,5 times the nominal maximum current(1,8A instead of 1,2A), but the circuit is ...
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4answers
88 views

I have three DS18B20's. I can't tell if any of them are working correctly

I have three DS18B20's (or I believe at least two of them are DS18B20's). I am currently reading them through an embedded Linux board (Raspberry Pi in this case). I have two of the sensors in a ...
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2answers
73 views

MOSFET Heat dissipation question

I'm designing an RGB LED strip driver, and for the MOSFETS for the PWM power switching I'm looking at using the PSMN022-30PL. It has a voltage limit of 30v, and can supply up to 30amps, which is more ...
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0answers
128 views

How to find replacement for a discontinued thermistor component?

I am in need of a thermistor with characteristics, such as those of now discontinued KTY84-130 (link to datasheet). I am after the exceptional linearity it features and also temperature range, up to ~ ...
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1answer
44 views

Room Temperature sense in a box

I have a sensor board placed in box with an ESP8266 and 220V to 5V adaptor board which both are considerable heat sources. But sensor is very far away from them at least 5cm. When I do not close the ...
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2answers
90 views

PT1000 2 wire probe. Can I add third wire?

I'v got 2 wire (81 cm) PT1000 probe which I want to utilize in a project. I would like to use current source and couple of opamps to make the measurement through ADC (uC) just like described here: ...
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63 views

Keep a Relay ON until Switch closes

Im trying to fix an egg incubator, currently has a mercury switch (when the temperature reaches two points on the glass, the mercury completes the circuit, it has small holes and some metallic strips ...
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2answers
73 views

Burning Temperature of Copper Winding of Motor

Burning Temperature of Copper Winding of Motor. I Have 3 motors 150watt 0.75Amp 220V in Copper and Aluminum and Copper clad aluminum. I want to know the maximum internal temperature of these motors ...
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0answers
42 views

Max operating temperature for a DC-DC constant current boost converter?

I am using a GERI® Dc-dc 250w Constant Current Boost Step-up Module to convert 12V to 30-35V. It is mounted to a 100w tdp heat sink. Two questions. I know the maximum operating temperature for ...
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2answers
85 views

Sensor for very low temperature (liquid nitrogen)

I'm looking for a way to measure temperatures in range of 40 to -200 °C (100 to −320 °F). The usual DS18B20 digital thermometer works only down to -55 °C (-67 °F). A precision of 2 °C would be good ...
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3answers
83 views

Drain current as a function of temperature

I was working on the temperature dependence of the Mosfet and I obtained the following characteristics shown below. Interestingly the drain current decreases with increasing temperature. But thought ...
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5answers
1k views

Measuring temperature with ±0.01°C accuracy

What is the most accurate way to measure temperature to ±0.01 °C? I have looked into using a Wheatstone bridge (with a minipot for minor calibrations) and an RTD for its precision and range. I ...
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2answers
78 views

Heatsink temperature probe

I read around that with an anonymous heatsink, you can measure its temperature when at regimen dissipating P watts. Then, (T-Tamb)/P gives its thermal resistance. Is that meaningful? Can I do this ...
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2answers
48 views

what is the base temperature when using ppm/c

I am not sure If I have phrased the question right but if not please correct me I want to know when Accuracy Parts per Million mentioned in the datasheet of voltage reference they say for example 5 ...
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2answers
108 views

A-Level Physics: What is the current needed to maintain the wire at a steady temperature of 387∘C?

I am stuck on answering an A Level physics question: When a current of 5.00A flows through a tungsten wire in a stream of air at 27.0∘C, the wire attains a steady temperature of 57.0∘C. It may be ...
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3answers
105 views

What is a good voltage regulator or voltage regulating circuit for my micro-USB battery charging needs? [closed]

I have a need for a voltage regulator such that I can use it to down-convert 5V USB to about 3.3V in order to charge a lithium battery. Ideally: Assuming some users may have a faulty micro USB input ...
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1answer
76 views

Design of three phase thyristor circuit for temperature controller

Circuit is powered by 3 phase, 415 V AC. This is connected to nri halogen tubes to heat a chamber up to 20 kW and 700℃. I have to control temp using delta controller DTA 7272 which will sense ...
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1answer
114 views

please help identify the temperature sensor on this PCB

The PCB is the wireless (outside) sender unit for an inside/outside thermometer. I want to create a temperature probe from this PCB so that I can measure a temperature in a very specific place. I need ...
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1answer
473 views

How to choose wire size for an air conditioner?

There is a difference between my calculations and what electricians say. Am I missing something? If I need to install a 3 horsepower air conditioner. Electricians always choose wires that are more ...
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2answers
171 views

How to Control the Temperature of Heating element using its resistance

In my test of a thin Film heater. I derived its Temperature coefficient of Resistance. This alpha number symbolizes the resistance change factor per degree of temperature change. My question is, Is ...
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1answer
106 views

How do modern electric blankets implement thermal sensing/feedback?

I'm looking to build my own 12VDC controller for a low voltage electric blanket (specifically, this blanket http://www.amazon.com/gp/product/B0041RQXKE ). An obvious implementation with a ...
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3answers
130 views

Can a MOSFET operate at very low temperature? [closed]

This is not a PCB question and asks only for a single MOSFET. I always wondered if there is a way that a single MOSFET would work at (any) very low temperature. I tried to find some source that ...
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2answers
50 views

PCB coating for a high temperature environment

What PCB coating is good for a high temperature environment (my environment is about 30-70 C), and is available in a spray can or so that is easy to implement without need of a device/machine?
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2answers
87 views

Fast detection of transient temperature change.. RTD? Thermistors? Thermocouples? or something else?

If I want to detect temperature changes on the order of 10ms, what is the best technology to use (besides IR)? I know Thermocouples and RTDs are pretty slow.. not sure about Thermistors.