Questions tagged [temperature]
Temperature is a property of a substance related to the amount of heat energy it contains.
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AHT10 temperature and humidity sensor does not work anymore
I have used the AHT10 before, I liked it, it worked well. After that I bought new a AHT10 but it is not working with my Arduino. I am using this library.
I checked closly, and there is only one small ...
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Is tungsten a good conductor of electricity? [closed]
If yes, why does it give off light and heat in a filament? If no, why? Tungsten is a metal, isn't it?
My proposition is that it is a moderate conductor, and it happens to be ideal for usage as a ...
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LM2596 Heat Sink
I’ve designed a DC-DC step down circuit based on the LM2596 regulator to replace a battery in a project. The circuit steps down a 12V supply to 3.9V and is used to power a module which draws 500mA, ...
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Transmission distance with AM2320 temperature and humidity sensor
I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
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Non-Inverting Amplifier
This circuit is for a temperature sensor with its output signal being amplified so as to be better processed.
What is the role of RI1 which is the input resistor of the non-inverting pin of the LM358.
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MLX90614 breakout board dead
I purchased two MLX90614 boards from aliexpress here.
They are both higher accuracy ( GY-906 DAA => 0.2°C, 3V) versions for medical instruments. I tried to hook one to Arduino nano (3.3V) but once ...
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Is the output voltage range of the LMT70 analog temperature sensor fixed regardless of Vsupply?
The differential ADC on my circuit has 1 channel open, and I decided that to place a temperature sensor IC. The temperature IC is LMT70. According to the output voltage table from the datasheet, the ...
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What is the impact of a lower TG for an RF Board?
I have a board that contains a WiFi module (2.4GHz). Does Tg have an effect on RF performance in any way ?
If the material can satisfy the other constraints, such as Dk, Df etc.. would the Tg be a ...
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Thermistor is accurate on Arduino, but is off by 10 degrees F on wemos d1 mini
I'm new to electronics and followed a simple thermistor tutorial which worked flawlessly. It uses Arduino Uno, a 10k thermistor and a 10k resistor.
Now I'm trying to use the exact same circuit except ...
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Difference between On-die and junction temperature
What is the difference between junction and on-die temperature.
I am using Xilinx Artix-7 FPGA
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Controlling for ambient temperature changes in a transimpedance amplifier
I'll start by saying I'm new to electronics, and have only minor working knowledge. I am designing a transimpedance amplifier to measure the opacity of a surface that is changing over time. The ...
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Total length of cable to connect 1-wire DS18B20 sensors without problem
Based on this topic and the connection that is proposed I would like to make two questions (if somebody has face the same problem/task). So can I connect the data cable to a raspberry GPIO and then ...
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Wiring 4-wire PT1000 to MCP3008
Is it possible to read a 4-wire PT1000 using an MCP3008, which is connected to a Raspberry Pi?
I can handle the software part; I am looking for how to wire things up.
Is this possible after all? Which ...
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Wheatstone bridge: Modifications for different temperature sensor resistance
I am trying to build a Wheatstone circuit to detect temperature changes of a low resistance (about 10 ohm) wire.
For a first try I would like to use a circuit proposed in this Maxim Application Note ...
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Which sensor should I use to recognize just humans? (not all of the obstacles)
I would like to make a social distance meter and the device should only avoid from humans, not the obstacles. I'll use an ultrasonic sensor and a PIR sensor but I'm not sure it will be enough. Do I ...
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Issue with circuit board implementing temperature circuit
I have not got a lot of experience with PCBs, but I have moved a breadboard circuit to a PCB and I am seeing an issue.
The objective of the board is to sense temperature. When the circuit is on the ...
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How to connect 15kΩ NTC thermistor sensor to thermostat which requires 10kΩ NTC thermistor
I have a electric floor heating in my house. Old DEVI thermostat broke down few day ago. Problem is that DEVI thermostats are expensive and a little bit dump (not smart). I want to replace thermostat ...
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Calculating maximum permissible track amperage for intrinsic safe PCB
I'm reading IEC 60079-11 standard (Equipment protection by intrinsic safety "i") which discusses how to design intrinsic safe circuit boards. In section 5.6.4 it talks about permissible ...
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Thermal pads, their thickness and conductivity
I would like fo know how do thermal pads work, more specifically why does their thickness matter so much even more so than their actual conductivity numbers sometimes and how do I choose the proper ...
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Measuring parallel resistor without current
I am trying to read the temperature sensor in a car with a Raspberry Pi. The temperature sensor's resistance changes as the engine temp increases however the temperature sensor would be in parallel to ...
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What is the absolute maximum temperature of a ceramic capacitor while not operating? (non-operational maximum)
I'm trying to determine the maximum non-operational limits of my system. The operational limits are easy to determine as they are provided in all of the datasheets for each of my components. However, ...
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How can I use a 2N2222 transistor as a temperature sensor?
I'm supposed to use a TMP36 transistor for a class to read the temperature of the environment, but I only have a 2N2222 transistor; the Arduino will have an analog read of it, but the numbers won't ...
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PT100 temperature sensor: meaning of "measuring current" specification
I'm measuring temperature using a PT100 temperature sensor on a Wheatstone bridge.
As I'm working on a battery powered application, I'm choosing the resistors in the bridge so that only a small ...
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Maths behing implementing temperature compensation on a signal
I have a fluid pressure sensor (blue line) whose measurements are affected by outdoor temperature (yellow line). So there is a 12 hours cyclic component (day/night) in my pressure measurements. How ...
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Measuring Discharge Rate of LiPo battery
I am attempting to change the temperature that a 3.7v rechargeable LiPo Battery is discharged in and am seeing how this affects the capacity and discharge rate of the battery. My setup currently uses ...
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Creating battery pack with biased thermistor resistor network. How to ground if sensing externally
I designed a battery pack board for a customer that uses a multi-cell low-side (NMOS) protection IC. The protection includes OV, UV, OC, and OT/UT protection for the pack. The Overtemp and Undertemp ...
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PTC thermistor vs. NTC thermistor for measuring the temperature of a liquid
I have to measure the temperature of a liquid. Does a PTC thermistor has any advantage over an NTC one? I mean, are there conditions where one is preferred over the other?
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Lead resistance of 3 wire RTD100
I am using a three wire RTD100 as a temperature sensor.
I know the advantage of the 3 wire RTD100 is that it gives accurate temperature output by canceling the lead resistance. First the resistance ...
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Temperature sensing with ADS1115
I am using an ADS1115 as an analog to digital converter to measure temperature. I am using an RTD100 temperature sensor to measure a temperature range of -40 to 150 degree celsius but the resistance ...
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Understanding Thermal Characteristics for Microchip CL2N3-G Constant Current LED Driver
I'm having trouble interpreting the thermal characteristics of the Microchip CL2N3-G Constant Current LED Driver chip.
Here's the datasheet: CL2N3-G Constant Current LED Driver 1
What I want to do is ...
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How to calculate temperature rise of PCB polygon?
I'm designing a PCB where I have a polygon that carries current from one terminal to two pads, each pad should pull 33 Amperes, so a total of 66 Amperes running through that polygon.
How can I ...
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UV protection for character LCD
I am using 20X4 character LCD display.
Like these: https://www.alibaba.com/product-detail/big-size-20x4-line-white-color_62471561311.html?spm=a2700.pc_countrysearch.main07.78.2bafd2a7u344W2
The ...
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Thermistor with sharp "cutoff" edge (reaching around 45°C)? [closed]
Is there a thermistor which has a very low resistance up to about 45°C and then, within a few degrees, raises the resistance to a very high resistance? Sort of like a self resetting thermal cutoff ...
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What type of vintage semiconductor device is this? Is it an SCR?
I found this circuit board from an 1980s old humidity controlled chamber. This definitely looks like a temperature regulator of some sort. It has a M logo which means made by Motorola. It has the ...
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Is there a non-contact temperature sensing technology that can measure the temperature of something emersed in water/other liquids?
It's pretty much all said in the title...
I want to get the temperature of a surface that my device is moving past. The surface may be as cold as -55°C. I was thinking about non-contact thermometer ...
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Building a furnace with more than one thermocouple for accurate temperature measurement
I am a mechanical engineering student. I am in the process of making a special purpose heating equipment. It could be considered as a 3 phase electrical resistance furnace.
I want the temperature in ...
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how to calibrate my multimeter temperature probe
I have a multimeter with the following temperature accuracy for its Type K probe
±3% of reading ±5C
The display is in steps of 1C
I attempted some calibration:
In ...
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PCB low power self heating component separation
I am an EE that is fresh out of college and and starting at a smaller company, and I have a question about electronic self heating, and how to keep heat from spreading in a PCB to heat sensitive ...
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What does it mean 'package limitation current' on a MOSFET datasheet?
I was looking at the datasheet for IRF1405 and got really excited when I saw 169A @ 25C!
Then I started scrolling down and it says 'package limitation current is 75A'.
Does that mean the maximum ...
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Effect of length on a thermocouple's accuracy
I'm a mechanical engineer working on acquiring some temperature data using thermocouples.
Q. I wanted to know the effect of wire length on a thermocouple's accuracy.
I don't have much of electrical ...
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heat sink solution for light source around 1000°C
I'm going to use a infrared light source IR12k which can reach 975°C for my design. However, I'm not sure whether I can solder this light source with cable whose other end is soldered with power board....
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Theoretical question: Could an incandescent light bulb be used as a temperature sensor?
Let's assume a plain old incandescent light bulb.
It runs on a fixed (assuming an ideal supply grid) voltage and will regulate the current going through it as its resistance raises with the ...
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Why is the MCP23S17 device getting too hot suddenly and randomly?
Circuit is a Raspberry Pi 4A SPI master node talking with one MCP23S17 device. I'm testing the single-circuit version in a protoboard.
We are using A bank GPIOs for reading, and B bank GPIOs for ...
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Is it okay to leave regulators heating at higher end of range of operating range?
IC operating range -20 to 80 degrees Celsius
Regulator IC application spec 12V in, 5V 1.5A output
Is it okay to keep IC running at 70-75 degree Celsius (with heat sink) all the time, circuit will be ...
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Help for checking if PID code
I am designing a PID temperature controler; as far as I managed to write it so far, you find the code below.
Can you please help me check if Integrator wind up and other PID elements are configured ...
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What sensor used in all non-contact body temperature guns?
With the whole COVID thing happening, there has been a proliferation of these handheld guns on the market. I have been struggling to find out what kind of sensor is actually commonly used in these.
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Sensors - How to convert 4-20mA output to temperature and pressure values?
I'm dealing for the first time with two sensors, of pressure and temperature. Both have output of 4-20mA, then I'm using a 47 ohms 1% to convert to voltage. When flows 20mA, 20mA * 47 ohms = 940mV, ...
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TMP36 changing values so much
I am using a TMP36 and an Arduino (like shown in the diagram below) to measure temperature.
The temperature sensor sensor is changing values abruptly. It looks like there is an error.
Can you please ...
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Calculate the Thermal Resistance (Junction to ambient) from Thermal Resistance (Junction to mounting base)
I have this MOSFET - MOSFET Datasheet
I want to calculate the maximum junction temperature of the MOSFET part. I have calculated the power dissipation.
In the MOSFET datasheet, there is only Thermal ...
user220456
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How do I accurately measure the B value of an NTC thermistor?
I'm trying to find a part number for an NTC thermistor being used to monitor the temperature of a rechargeable battery. The thermistor I have has no color markings or numbers to indicate any ...
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