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

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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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1answer
66 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
31 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
42 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
22 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
83 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
74 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
143 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
63 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
47 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
64 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). ...
2
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3answers
179 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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1answer
52 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
47 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
60 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
134 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 ...
6
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4answers
380 views

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

Its quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if it's not overheating per se. If, for example, ...
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1answer
203 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
141 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
104 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
421 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 ...
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2answers
123 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
350 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
50 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
164 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 ...
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1answer
90 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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312 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 ...
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3answers
140 views

Peltier Unit Not Working

Recently I ordered a Peltier unit online and received it yesterday. Naturally, I was very excited to play with it. When I first turned it on, One side got hot, an another very cold. I had read that I ...
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1answer
132 views

Vegetable oil controller?

So I have been working for a while now on a controller for the vegetable oil system in my vehicle. I am fairly new to programing and am enjoying teaching myself with an arduino. I have an arduino nano ...
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5answers
358 views

Sensor for ultralow (to -85°C) freezer monitor

I am planning to build a series of Arduino-controlled temperature-reporting units for a room full of "Ultracold" -80°C freezers. (I ultimately want to convert the signal to a serial stream that will ...
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1answer
56 views

How can one calculate Load Regulation for a temperature sensor?

I am wondering how to calculate the Load Regulation of a temperature sensor. For example ADI's TMP37? I know how to calculate % Load Regulation from Wiki, but not sure how to get to the mC/uA units? ...
3
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1answer
238 views

PID implementation for a Humidity controller

I'm working on a humidity controller which uses PID algorithm to control the process values. I have to implement 2 PID routines as there are 2 process values ( Humidity and Temperature) to be ...
2
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3answers
228 views

Arduino Rounding question

I have made a simple thermostat for controlling a 12V heater. The temperature range can be from 0 F to around 190 F. For some reason when the displayed temperature on my LCD goes from 99 to 100 ...
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2answers
344 views

Warming PCB in a low temperature environment

I have to develop a microcontroller circuit that will run at low temperatures (as low as -60C). I want to heat the FR4 PCB board until it reaches the commercial temperature range above -40C. I found ...
3
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2answers
78 views

What type of electronic hardware is best suited for high temperature applications?

What type of electronic hardware is best suited for high temperatures, roughly 200°C? From what I've discovered, most FPGAs, microprocessors, and DSPs have an operating temperature of 70°C or below. ...
2
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1answer
427 views

Converting an ADC value to equivalent Temperature?

I'm working on a humidity controller which also controls the temperature inside a chamber.I'm done with the hardware (though i'm not the one behind the design)and which was originally designed with ...
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0answers
68 views

Which microSD card socket is compatible with -40 … +70°C temperature range?

I have an industrial-grade microSD card, which is specified with a temperature of -40 ... +70°C. I need a push/push socket or similar socket with locking functionality. I searched for such a socket, ...
3
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2answers
242 views

Converting raw temperature data to Celcius L3GD20

I have an L3GD20, which is an accelerometer with a temperature sensor built in, and I want to make sure my math isn't funky regarding the temperature. I'm not exactly experienced with embedded ...
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1answer
255 views

How do you create a spice model of a lm234? This model would need to be used with both LTspice and Labcentre's Proteus software

How do you create a spice model of a LM234? This model would need to be used with both LTspice and Labcentre's Proteus software. Please note that I have never created a spice model.
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1answer
147 views

Using Analog Devices TMP36 temperature sensor with Arduino. Issue with Shutdown pin

I am using an arduino to measure ambient temperature by reading an analog voltage from an Analog Device TMP36 temperature sensor. ...
4
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1answer
73 views

Relation of case temperature to junction temperature

I'm comparing the thermal characteristics of two ethernet switch ICs. They both come in the same package and their thermal resistances are: IC1 θja 51.42 C/W θjc 20.66 C/W IC2 θja 41.54 C/W θjc ...
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1answer
770 views

Measure resistance accurately with an arduino?

I'm looking at performing accurate temperature measurements with a three wire RTD, and I'd like to be able to measure the resistance and thus the temperature using an arduino. The accuracy I'm looking ...
7
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2answers
1k views

Using 1N4148 As A Temperature Sensor

Can I know which component senses heat or acts as heat sensor in the following circuit? In the given diagram, it is said that the 1N4148 diode acts as the sensor. But basically it is a zener diode and ...
11
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4answers
360 views

Do computers speed up at higher temperatures?

At higher temperatures, will computers get faster? Evidently, one always wants cool a computer down as higher temperatures can damage core components. However, is it an interplay between silicon, ...
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3answers
210 views

Step down switching regulator heating up with light loads

I built a step down switching regulator based on a Diodes AP5100 using the datasheet example circuit with this layout. The voltage is being stepped down from 15V to 12V and the AP5100 is heating up ...
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1answer
247 views

Picking Thermistor for Low Power Push-Pull Output Amplifier

Regarding the following low power push pull transistor "Deacy" amplifier: what type and value of thermistor might be used as depicted in this graphic: to add temperature compensation to this ...
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1answer
237 views

LED brightness control using PWM according to temperature of RTD/PTC/NTC thermistor

I am working on this project. Everything is going okay; I am generating PWM using a 74HC14 IC and I have used a potentiometer to vary the brightness of LEDs until now. The actual problem arises when ...
2
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1answer
116 views

PCB mount thermocouple socket

I am designing a product that uses a thermocouple to monitor temperature. I am trying to decide what is the best way for users to attach the thermocouple to the PCB. I have found the connectors that ...
3
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2answers
459 views

Temperature compensation of LSM303DLHC accelerometer / magnetometer

ST Microelectronics makes the LSM303XXXX, a popular range of 3-axis accelerometer / magnetometer sensors that are used on Arduino breakout boards, etc. The older LSM303DLH sensor has been replaced ...
2
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1answer
136 views

Operating limit of K-type thermocouple probes

I was looking to purchase a K-type thermocouple and noticed something peculiar. Wikipedia says it can withstand temperatures up to +1350 °C, but Amazon sells some K-type thermocouples that only go up ...