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

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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 ...
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1answer
267 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 ...
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3answers
126 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
71 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
83 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
53 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
82 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 ...
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2answers
103 views

Arduino LM35DZ giving incorrect voltage

I have an LM35DZ which is temperature sensor, properly connected and reading strange values... like 1023. I've tried almost any code I could find regarding LM35DZ and Arduino, with the same results ...
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54 views

Simplest way to detect body heat

I need to detect how hot/cold a person is with a sensor (or multiple sensors) in close contact. I've looked at temperature sensors such as 18B20 and TMP36 but I'm not sure how to detect if a person ...
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1answer
84 views

What kind of temperature sensor is this?

What kind of temperature sensor is this? What would be the best method for getting a reading from it?
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3answers
67 views

How does a temperature sensor work?

How does a temperature sensor gather temperature? What is the mechanism used? More specifically I want to understand how the TMP102 sensor works.
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1answer
73 views

What is a suitable device for fast temperature process control?

Here is a ceramic heater catalog: product sheet These heaters can ramp up as fast as 150 degrees C per second. I am not entirely sure what I am searching for but let's look at my use case: Say I ...
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1answer
72 views

UPS batteries and hot/cold weather

I am designing a small network deployment for several buildings without temperature regulation. In planning the power, I can find very little about acceptable UPS batteries for these conditions. ...
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3answers
294 views

Boost DC voltage converter for wireless temperature sensor (1.5V to 5V)

I'm trying to design a wireless temperature sensor powered by one (or maybe two) rechargeable NiMH AA cell(s). The sensor should read and transmit the temperature every couple of seconds and remain in ...
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1answer
57 views

Variation of the amplifier input impedance by the temperature

I have a question, How can I calculate the input impedence in amplifier when the union base-emitter temperature is different (25C 100C, 50C ...)?
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1answer
53 views

How much is the current consumption of this sensor (tmp102)?

Here is the data-sheet. I just want to know how much time it takes to measure the temperature and how much current it consumes. I struggle when trying to find such info in the data-sheet so any help ...
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2answers
49 views

Is there a temperature sensor which triggers voltage output upon breaching a temperature threshold? [closed]

Is there a temperature sensor which will output a certain voltage if the temperature is below a certain degrees? e.g. Output 5v if temperature is < 0°C and output 0v if > 0°C. I'm trying to figure ...
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3answers
181 views

IC - Case temperature vs Operating tempaerture

When datasheets lists(MAX9744) that the normal operating temp are b/w -40 c to 85 c but the case temp should not be up above 165 c what are they suggesting. How come an IC work if its case temp gets ...
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2answers
42 views

Remote Temperature Readout

My house is on a giant hill. The city only provides enough water pressure to get me water half way up the hill. A long time ago a pump was installed in a small dugout on the side of the hill (about ...
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3answers
359 views

What is a suitable temperature rise for PCB traces?

I'm designing a PCB for a 10A relay and am trying to determine what the trace width should be. According to this trace width calculator, the biggest factors in the width are copper thickness, ...
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3answers
146 views

Cost-sensitive way to maintain a 220C temperature

I'm building a device which is designed to be built by people of varying skill and education levels. Part of it needs to climb to and maintain a temperature of 220C, but I don't need very tight ...
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1answer
371 views

How does soldering affect the internal bonding between the IC die and its package?

In other words, How does the IC fabricator solder these thin wires between the die and the pads and guarantee that the soldering iron temp (300C for example) on the IC pads won't desolder them?
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1answer
52 views

NXP i2c temperature probe locking up

I have an issue with an NXP SE95 temperature probe that has been working just fine up until now on other systems. At some point, either on boot or soon after, the probe will have some sort of meltdown ...
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2answers
249 views

Temperature measurement using LM35

I'm doing a project on beaglebone black and I'm interfacing a LM35 temperature sensor (datasheet) to one of the ADC pins of the beaglebone. As per the Beaglebone datasheets the reference voltage of ...
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1answer
50 views

Transfer function for a temperature sensor

I have a STLM20 temperature sensor with a transfer function of: V0=(-11.69mV)/C *(T) + 1.8663 V I have solved for T then it should be: T=85.543*(1.8663-V0) is this correct?
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2answers
57 views

Best temperature storage IC? EEPROM or SRAM IC

I am trying to integrate a temperature sensor along with the storage capability with it. Both temperature sensor and the storage device will be controlled by FPGA. Which device would be the most ...
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0answers
25 views

Setting the range of a grid thermal sensor

I have a question upon reading data through the thermal sensor row by row. For example, my sensor has a 4x4 grids, I want to read each row and by taking the average temperature per row divided by ...
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2answers
133 views

Select channel from multiplexer to show temperature values in c programming

I have question regarding selecting channel from multiplexer. I'm trying to receive some temperature reading from the two sensors which shared the same address and while I'm using one sensor, it can ...
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2answers
101 views

IC's in high altitude and low temperatures

What happens to IC's when trying to operate them in extremely harsh cold and high altitude environments like Mt Everest? Could you take any ordinary phone or computer up there an expect it to work? I ...
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2answers
149 views

Soldering guidelines for freezer applications?

I'd like to do a home project where I take temperatures inside of my freezer and inside liquids. Liquid-compatibility aside, I'm mostly curious about whether or not anyone can recommend some best ...
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1answer
70 views

Storing electronics in low temperatures

Is there any disadvantages in storing electronics in cold storage (min. temperature about -30 °C/-22 °F)? I am speaking about non-assembled components and assembled (consumer) electronics. I am aware ...
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1answer
57 views

Bipolar Transistor PTAT Cell and setup

I am in a measurement systems class at school, and we have a project to design a measurement system. I was reading my text book when a diagram caught my fancy, and I thought I would try to build it. ...
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1answer
86 views

Temperature Sensor recommendation for measuring panel temperature

In my application, I am using a MAX6699 for monitoring the temperature of the PCB. The chip supports four channels, whereas I am using only 2 for monitoring the PCB temperature (through P-N diode). ...
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3answers
356 views

How to measure high power LED temperature?

I have a 100W LED module that I believe is overheating due to the heatsink being too small. I use a piece of anodised aluminium from an old fanless PSU. It's only 300g so far too small for 100W led so ...
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61 views

Thermocouple on a grounded stainless steel box

My present project is a ~6kW switching converter in a sealed stainless steel box. The box is grounded well. When I put a thermocouple on the surface of the box, the reading is noisy. Even if I put ...
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2answers
57 views

Calculate BJT Temperature when the output connect to 16V [closed]

Hi, Would need a help on how to calculate the BJT's Temperature when the "L" Output was connect to 16VDC? Need to know the Temperature dissipation of the BJT on calculation. Thanks Lee
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2answers
69 views

How important is the temperature stability for gain - setting resistors?

When two resistors are used to set a gain of an opamp, do I need to care about their temperature stability, provided resistors are from the same series, same manufacturer? Let's say my circuit will ...
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2answers
145 views

Are devices damaged by high current, or high temperature?

I'm wondering if electrical devices are damaged by the current or by the temperature. Imagine we have a little device with a maximum input current of 500mA. I'm sure that if we subject it to 1A or 4A ...
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438 views

What exactly gets “worn out” and damaged by heat?

It's quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if they are not overheating per se. If, for ...
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1answer
563 views

LM35 negative temperature sensing circuit

I'm planning on using the LM35 temperature sensor to measure both positive and negative temperatures. The recommended schematic to measure negative temperatures without a negative voltage supply is ...
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3answers
194 views

How to measure the temperature of a thin wire using a infrared (IR) thermometer?

I got a laser thermometer to measure the temperature of a wire for my science fair. However, when I attempted to measure the wire, it was too thin and I just measured whatever was behind it. How can I ...
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3answers
173 views

ADC in Digital Temperature Sensor DS18B20

According to the datasheet of DS18B20 temperature sensor, it is clear that the sensor is digital so the output is in digital form. The resolution of the temperature sensor is 9, 10, 11, or 12 bits, ...
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5answers
761 views

Accurately measuring temperature with Arduino

I'm trying to build thermostat with Arduino. I want to power it using mobile phone battery/charger which makes system voltage quite variable. Right now I use Arduino Uno, but once it is complete I ...
5
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2answers
151 views

Why does the bandwidth of an OP Amp decrease as temperature decreases??

From this NASA article on figure 5, you can see that the bandwidth of the operational amplifier drops as temperature decreases.. What is the mechanism that causes the drop on bandwidth because as ...
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2answers
596 views

Why would I use a thermistor instead of a LM35/36?

Is there any advantage over the other in using a thermistor versus a temp sensor like a LM36 or LM35? The only major difference I can see is that the LM35/36 have voltage limits of 5.5V and the ...
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1answer
53 views

Semiconductors-Achieve specific temperature

I want to achieve a specific temperature using a semiconductor or an electrical resistance in general. The temperature I want to achieve is at about \$30^oC = 86^∘F\$. This experiment consider it to ...
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1answer
235 views

XBee + TMP36 temperature sensor - returning inaccurate values

I have rigged up a basic circuit as follows: The XBee is a Pro, series 2. It is configured as a Router using the AT firmware. Pin 20 (D0) is configured as an analog input. There is a co-ordinator ...
0
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1answer
119 views

Constant Sum Voltage Divider With Thermistor/Temp Sensor

I need a circuit with a thermistor/temp sensor that will essentially emulate a pot. In other words, I need a voltage divider that varies with the resistance of the thermistor/sensor, but keeps the ...
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385 views

555 Temperature Controlled PWM

I am trying to build a temperature controlled 555 circuit to drive a cpu fan (used for cooling my entertainment center) I built this using slightly different diodes and MOSFET, and it works great ...