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

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DHT22 temperature & humidity sensor react slowly to the environment change

I am right now connecting the DHT22 temperature and humidity sensor to the Arduino. It works well to print the temperature and humidity value every three seconds. However, I made a experiment to put ...
3
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2answers
44 views

recommended wattage for soldering station

I'm looking at buying a new soldering station and trying to figure out what would be the right wattage. I'm going to soldering everything from electronic components (not much SMD, if any) to 16mm2+ ...
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14 views

MEMS Gyro temperature compensation

For a project that requires the use of a MEMS gyro sensor to maintain a fixed heading, I am trying to implement the ST L3GD20 MEMS chip. Very briefly, it has two internal low pass filters and a high ...
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1answer
32 views

Looking for a high temperature potentiometer [on hold]

Does anyone know of any potentiometers that are rated up to 500 degrees F?
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1answer
38 views

Powering ATtiny85 for temperature sensing

I have been working on a miniature temperature sensing module which buzzes once the temperature crosses a threshold using ATtiny85, lm35 and a pico buzzer. When I power the whole circuit using an ...
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4answers
92 views

Is there a Formula to Predict Delta Temperature based on previous trend?

I need a way to predict delta temperature curve based on previous trend. I do a lot of heat rise testing on electrical conductors and I would like to be able to atleast get an approximation of the ...
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2answers
57 views

How do you measure the actual package temperature of PCB components?

We have an IR thermometer at work, but sometimes I feel like the results aren't completely accurate due to the beam width (especially on small components) or material emissivity. Another way I've ...
3
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1answer
79 views

Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...
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1answer
39 views

What is the critical temperature when (batch) desoldering?

I have seen videos on youtube with some guys using hot air pistols (or even small propane burner with bunsen flame) to desolder the components from a PCB. The job is done REALLY quick! The components ...
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1answer
53 views

How hot do High Power 1-3W LEDs get

I'm thinking of Using 3W RGB high power LEDs for a project. I will only have one color on at a time so I'm pretty sure that it would be 1W of ussage at a time. (please correct me if I'm wrong) My ...
3
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2answers
71 views

Alternative ways to maintain temperature stability of silicon BJT circuits other than feedback resistors

So I've been messing with Bipolar Junction transistors lately and I'm trying to really nail the concepts of designing circuits with these things cause I want to start using them in some of my circuits ...
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1answer
38 views

Ambient temperature vs operating temperature?

I would like to know the difference between Ambient temperature vs operating temperature? In datasheets they specify operating temperature for IC's. ex -25°C to +125°C, so does this mean even though ...
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0answers
24 views

What sort of sensors are used in Luna, smartbed device?

Luna is basically a sheet that is placed on your bed and measures temperature, then adjusts it for you with the optimal condition. I was wondering what kind of temperature sensor they use for reading ...
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1answer
47 views

Pros / Cons of LM35 and Thermistor, what alternatives?

I'm wondering which benefits/downsides I have using following thermometer? Is there something I'm overseeing? For easy temperature measuring, what would be the easiest? My Opinion is LM35, am I right? ...
4
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4answers
172 views

How to best connect a temperature sensor to an aluminum block?

2 questions: How would you connect a temperature sensor to an aluminum block? Could I use a thermal adhesive, basically just gluing the sensor to the block? Which sensor would you buy? I like the ...
6
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5answers
598 views

Where is the cold junction on the commercial thermocouples?

According to all textbooks and articles, a thermocouple must have a cold junction somewhere on the middle of it. But none of the commercial products have a middle point or a marked spot for ...
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1answer
60 views

How to control the temperature of heating element

I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how ...
4
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2answers
72 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
2
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1answer
63 views

Implementing an Avalanche Photo Diode Circuit

I am working on a circuit that will make low light measurements in the visible range. The measurements will be of biological samples that are fluorescing. For this application an Avalanche Photo Diode ...
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0answers
51 views

How does temperature affect the performance of an SMPS?

I have an SMPS (laptop AC adapter) rated for 180 W that is presently operating at capacity. The output seems to be limited by internal resistance, but I can't really tell. I'm trying to get it ...
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1answer
29 views

High Energy Metal Halide Bulb Heat?

I am building a custom box from wood (around 14 inches by 10 inches by 10 inches) to encase 3 high energy Metal Halide Bulbs (400+ watt each). The box will be opened and closed intermittently, ...
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1answer
61 views

DH-11 Sensor on a Raspberry Pi & Arduino

I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit: ...
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2answers
96 views

How can I make the dimensioning of a temperature monitoring circuit?

I need to design a circuit to measure temperatures in the range 15-40 degrees C (this will later be the basis for a regulator of a peltier-element for a fridge). I tried a circuit using the ...
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0answers
27 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
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3answers
62 views

Could I use a surface mount thermistor to measure ambient temperature?

I'm working on a project where a device I'm using has this thermistor, a Murata NCP15WF104F03RC, to measure the temperature of the device itself. This is a surface mount thermistor. The implementation ...
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0answers
33 views

Does a Temperature + PPG integrated sensor exist?

I am trying to measure body's temperature and pulse from the ear (fitting sensors inside of earbuds). Does some kind of temp + PPG sensor exist? It would be great to reduce needed space. I could then ...
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2answers
223 views

Electronics can fail due to overheating, overvoltage, and mechanical stress. Are there other causes? [closed]

My experience with power electronics failures have generally fallen into three categories: overvoltage, overheating, or mechanical failures. Each might have manifold sub-causes, of course. ...
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24 views

What is the temperature vs time relationship for derating soldering iron dwell time?

Another question here involves someone using a 100 W iron to solder electronic components. This is much hotter than required, in my experience. The soldering specs for ICs are typically ...
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2answers
51 views

Capacitors - аffected by temperature or not? [duplicate]

Are these capacitors аffected by the temperature changing or not? http://www.cde.com/resources/catalogs/TAS.pdf
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1answer
39 views

Temperature Coefficient of Capacitance

How can I find the Temperature Coefficient of Capacitance of the following capacitor series: http://www.cde.com/resources/catalogs/TAS.pdf
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1answer
31 views

How does cold weather affect the electronics

At Why exactly do chips start malfunctioning once they overheat? Sharptooth asked a very nice question about how does overheat affect electronics. That raised me the question of what does cold ...
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1answer
59 views

How are Operating Temperature Bands Determined?

Manufacturers like Maxim, Altera, and many more seem to adhere to a commonly defined range of temperatures for applications. For instance, Full military (-55°C to +125°C) Automotive (-40°C to ...
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2answers
193 views

STM32F103RB ADC (pics included) strange values for temperature sensor (LM35)

I've connected one battery/2 batteries (GND and A0) and the measuremet displayed on the com26 port is ok. I've connected the LM35 (The LM35 has 1 celsius degree for 10mV measured value) on the VCC and ...
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1answer
49 views

Temperature sensor slope explanation

I am looking at an accelerometer(data sheet is BMA280 ) which has capabilities of measuring temperature from -40 to 85 degrees celsius. It also specifies a Temperature Sensor Slope of 0.5K/LSB, where ...
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1answer
66 views

What is a single conductor temperature sensor called?

What is a conductive temperature probe called? They're relatively massy metal rods (5-8mm thick, 5-15cm long) that have a single conductor (NOT 2 conductor wire) to connect to the thermostat. The ...
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1answer
125 views

What is the formula for Nichrome

Having no knowledge of electricals, I am interested in learning the applications of Nichrome. I understand it has swg ratings. But what I am looking for is a formula that can calculate a particular ...
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1answer
54 views

Typical Resistance Temperature Coefficient Variance between a reel of same value resistors

I have a resistor divider, I'm interested calculating the drift of the divider over temperature and if possible minimizing it. I was wondering if both resistors in the divider have the same value ...
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44 views

IR temperature Sensor reading ambient temperature in a room

I bought a product that has a IR temperature sensor and I want to receive a "good quality" ambient reading of a room. I have an idea how to use the IR sensor for the ambient, even though it would be ...
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1answer
98 views

1-wire humidity sensor with ID

I've created a temperature monitoring system using multiple DS18B20 temperature sensors and now I want to add some humidity sensors to it. The problem is that I cant find any 1-wire humidity or ...
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1answer
81 views

Two transistor temperature sensor

Background I was considering making a temperature sensor from some NPN transistors. I read the Wikipedia page on Silicon Bandgap Temperature Sensors (can't use more than 2 links...) and this piece ...
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1answer
84 views

Anyone may suggest a temperature sensor technology that will work to a max of 200ºC?

Cheapest sensor technology as possible, up to +- 5ºC or 5% of accuracy. Better if it doesn't need complex (and costly) additional circuits.
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1answer
83 views

Temperatures for replacing BGA chip?

Newbie here who is going to try his hand at replacing a BGA chip on a laptop motherboard. I have ordered a new chip: NVIDIA G84-950-A2, and want to confirm some temperatures. Based on some ...
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52 views

Temperature Sensor Circuits problems (circuit and schematics pics included)

Just finished soldering this college project and tested for shorts with multimeter. All good in that region. The problem is the output at room temp is reading 3.5V ish which corresponds to over 40 ...
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3answers
146 views

RTD sensors and the mystery of Voltage Vs Current sources

Alright folks, I know there are a decent number of threads about RTD sensors (resistance thermometers. most associated with platinum type ones) Let me first assure you then hopefully show you that ...
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2answers
116 views

PT100 calibration

If I take (say) a class B PT100 sensor with a stated absolute accuracy of +/- 0.3 deg and calibrate it with a freezing/boiling chemical at (say) 50 deg will that make it inherently more accurate when ...
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35 views

DHT11 remote sensing — which resistor?

According to the DHT11 data sheet here: http://www.micropik.com/PDF/dht11.pdf, on wire runs longer than 20m, one should use a 'different' pull-up resistor from Data to VCC. What should the value be, ...
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1answer
125 views

What ppm/K correspondes to?

I have precision resistor 10 ohm and 5ppm/K. Does it mean that on delta 1K it will jump up/down 5 ppm of 1 ohm or 5ppm of resistor value - 10 ohms? I think that it corresponds to resistor value. But ...
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1answer
71 views

Temperature calibration for MCP9808 [closed]

Reading a lot, I have found nothing about calibration for the MCP9808. I have read the datasheet and understand that the chip converts the temperature to Celsius. The given accuracy in the datsheet is ...
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1answer
33 views

DS18B20 temperature interpretation

I have a problem interpretting the temperature reading of a DS18B20 chip. There is a certain situation I am not abble to resolve. This is the example temp table for the chip from the datasheet: an ...
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90 views

Microchip 9808 temperature sensor - Incorrect calculation result

I am using a Microchip MCP9808 I2C temperature sensor (https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-sensor-guide/overview). I'm having problems being able to calculate the ...