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

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34 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
46 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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75 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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61 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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37 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
49 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
63 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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3 views

DS18B20 not fully working on Raspberry Pi [migrated]

I've followed instructions through various sites which have all given the same information about wiring the DS18B20 sensor to a Raspberry Pi (red is 3.3V, black is ground, white connects to GPIO pin 4 ...
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28 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
40 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
45 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
25 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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0answers
58 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 ...
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9answers
6k views

Why do electronics have a low temperature limit?

Apart from condensation why do electronic components usually have a low temperature limit? For example my laptop says something along the lines of -10 °C to 75 °C temperature while in use. I can ...
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0answers
29 views

Average two probes

I have a MASH Tun that I have two 10 ohm thermoristor type temperature probes. THese have two wires (one a ground) I have a small PID (BCS 462) type device that used to be able to average the two ...
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0answers
98 views

Safe temperature range for 18650 battery - powerful flashlight

There are many powerful flashlights, some of them have just one 18650 li-ion cell, 10W LED and they are very small. I have read few tests, I watched few video tests on YouTube and looks like some ...
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1answer
35 views

Temperature compensation accelerometer and cross axis sensitivity calibration

I'm trying to compensate a 3-axis MEMS accelerometer for temperature. I can access a climate chamber where the device can be rotated in ONE axis. There is another place where I can rotate two axis, ...
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1answer
74 views

All capacitors leaking on Emotiva PSU? [closed]

I've just opened the top of my XPA-2 amplifier and had a huge surprise: it seems like almost ALL of the caps are leaking from the bottom. Not just the main PSU caps, but smaller ones on PSU PCB and ...
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3answers
101 views

How much power can a thin wire handle before heating too much?

If I have a copper wire 25um in diameter and 3mm long, and I'm running AC current through it at 3GHz, how can I calculate how much it heats up given a power and duration? The wire is immersed in oil ...
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1answer
59 views

How can I mount a DS18B20 tempreature sensor to a large heatsink?

I want to monitor the temperature of a large peltier element's heatsink to control a fan. I think I'm going to use a DS18B20. The 3 pin TO-92 looks like it's plastic, so I'm already worried about low ...
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2answers
55 views

Temperature Sensor Verilog

Hello I have been working on an analog temperature sensor TMP36 and I am trying to get the temperature and display it on the NEXYS3 SSD. I am aware the NEXYS3 does not have an analog pin and I built ...
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1answer
43 views

DS18B20 temp sensor IC

DS18B20 temp sensor IC Dq pin is connected to PSEN of controller in my application. But in datasheet its mentioned that its ...
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1answer
71 views

PIC operating temperature… “industrial” vs. “extended”

I am shopping for a PIC micro-controller for use in an automotive application. I noticed that PICs are offered in both "industrial" and "extended" temperature ranges ([-40C to +85C] vs [-40 to +125]). ...
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1answer
57 views

Digital temperature detector

I am using LM95071 temp detector IC for temp sensing. Link for datasheet: http://www.ti.com/lit/ds/snis137d/snis137d.pdf Its a digital temp detector, it will show equivalent ADC count. But where we ...
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78 views

temperature compensation circuit using AD8515

Can I use AD8515 op-amp as temperature compensation circuit for pressure sensor? The picture shows how I intend to use it.
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2answers
54 views

PT100 sampling and accuracy

How accurate can I get temperature measurements if I repeatedly sample the data from a PT100 sensor. [Assuming I have a 16 bit converter]? What are the limits on accuracy and repeatability? Does the ...
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2answers
76 views

LM1084, should I leave the copper area connected to the TAB floating? [duplicate]

I am using the LM1084 in a DDPAK package as a 5V USB voltage regulator on 4-layer board. The TAB of the package is internaly connected to pin 2 (OUTPUT). I am not sure what to do with the copper ...
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3answers
140 views

How to make the hottest CPU temperature?

Besides just running an infinite loop, are there any tricks (like maybe cache misses?) to making a CPU as hot as possible? This could be architecture specific or not.
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1answer
36 views

Max voltage output of DS18B20

I am using the DigiX board and trying to connect a DS18B20 (one wire temperature sensor). One of the issues with the DigiX is that it can only tolerate 3.3V on the I/O pins. I have been trying to ...
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0answers
30 views

Implementing Peltier temperature controller in a circuit

I need to measure the temperatures of semiconductors using a Peltier temperature controller. I am using a DT9818 (it's a USB collection board from what I have learnt). I would need to use software ...
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3answers
136 views

Can I put 2 voltage regulators (5V) in parallel to dissipate the heat better?

I connected around 10m of christmas light LEDs to a 5V voltage regulator (lm7805). It gets quite hot, put I can still touch it without burning my finger. So in is within its temperature range (120 C ...
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1answer
151 views

Temperature stabilization with PWM , PID controller with delay system

I am doing a project to control the temperature with PWM. I use peltier, thermistor,mcu and h-bridge mosfet. I want to reach a temperature with an error less than 0.05 and stay at that temperature ...
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2answers
90 views

Platinum RTD temperature sensor choices between 1000ohm and 100ohm

I heard the Platinum RTD temperature sensor are very accurate and I want to use it for my temperature measurement project (-40 degree to 80 degree range). I don't want to use other type sensors. ...
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78 views

What is this kind of temperature sensor called (Analogue Devices TMP36)?

I am reading about this stuff, and I have found clear definitions of thermocouples and thermistors online, eg on Wikipedia. But then I also found something different, e.g. what they at AdaFruit just ...
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3answers
88 views

Electrical resistance converted to wire temperature

I'm trying to get a formula that I can reuse to help me determine wire size and properties. The goal is to heat a 430' wire between 40-100F using 12 volts and 10 amps of direct current. Everyone is ...
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2answers
182 views

Will an electric heater coil stop drawing power when the surrounding temp is the same as the coil's temp?

I am trying to figure out if I can melt Aluminum cans using a heater coil from a toaster oven. I've already used q=mc∆T and q=m*(Latent heat of fusion) to figure out how much energy is required to ...
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1answer
107 views

Automotive Sensor - Excessive Ripple Noise

I'm designing an automotive oil temperature sensor based around a 3-wire RTD. This is my analog circuitry: U1 and U2 provide a 1mA bias on the RTD which is measured by U3 and gained up by U4. R5, ...
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1answer
83 views

Soldering CPUs/GPUs/FPGAs - temperature issue

I am thinking about making my own FPGA board and soldering using reflow. The tutorials I've read all say the process requires temperatures in excess of 220 °F. However, at least according to this ...
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5answers
189 views

How to generate Red light from a Blue-Dominated Spectrum

I have a white LED light source, the spectrum of which looks as follows --- want to filter out red light from this white LED source. But as you can see the spectrum dwindles in the red zone. And ...
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2answers
121 views

Heatsink or IC: how to determine root cause of overtemp?

I have a manufacturing situation where we perform a functional test on a board and we are getting frequent overtemperature failures from a BGA package with a heatsink on it. I would like to be able to ...
5
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2answers
157 views

What does 25°C mean on a transistor data sheet?

The background is, I'm trying to understand how well a typical transistor obeys the Ebers-Moll equation at constant (junction) temperature. See this snapshot taken from the Fairchild datasheet of the ...
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0answers
82 views

How to use LM56 to switch on/off a 2kW heater using a MOSFET

I have an oil heater at 220V/2000W so lets say 10A (maybe more when it starts?!). I was thinking of creating a circuit to switch the oil heater on/off with a LM56. Is it possible using a MOSFET ...
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0answers
48 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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4answers
2k views

Storing batteries in a refrigerator

The electro-chemical reaction is more favorable at higher temperatures. Consequently, when it is warmer, the batteries will perform better. This is also evident from practice: old batteries do not ...
4
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1answer
330 views

Weakest link in lifetime of electronic circuits

I'm working on a product, a single-board computer with an expected lifetime of 10-15 years, and I'm trying to identify the correct components to focus on for this. So far electrolytic capacitors ...
2
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3answers
430 views

Why is my analog temp sensor's signal so unstable?

I have an analog temperature sensor (TMP36 - datasheet - product page) and it is properly connected to an analog pin for reading its output. The Arduino sketch (firmware) works just fine. Everything ...
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3answers
99 views

Temperature Sensor probe lifetime

Need a good 1 wire temperature sensor, there is a lot of information about the DS18B20, but I see nothing about it's quality or expected lifetime. I was wondering which is the expected lifetime of a ...
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2answers
192 views

Cheap temperature sensor

For a project I need a cheap (less than 10 Euro) en simple solution to measure temperature. Accuracy is not really important, +/- 3 Degrees is acceptable. The desired temperature range is between 0 ...
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2answers
101 views

Fast-stabilising skin temperature sensor

We're currently trying to build a portable temperature sensor for the purposes of estimating human core temperature. This is a bit of an engineering problem (more to do with choice of materials than ...
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1answer
158 views

Analog temperature sensor with 100mV per 1 degree Fahrenheit

My devices only measure analog precision to the nearest 100mV. Most temperature sensors I can find only do 10mV per degree precision. Currently I'm using the LM34. Is there such a thing as an analog ...