Questions tagged [temperature]

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

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Furnace circuit ideas: constant temperature with thermocouple & heating element

I am wanting to make what we will just call a furnace that will always operate near 1800°F. I'm looking for circuit ideas or a direction in order to maintain the temperature of the furnace. The ...
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please, logic for how to measure glucose using temperature in human body [duplicate]

I am not able understand logic that how to measure glucose level using temperature please help me finding the logic
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PT100 wiring: use different wires joined together and cable length considerations

I am trying to convert a fridge into an incubator for turtle eggs. I would like to make as little modifications to the fridge as possible (i.e: avoid drilling holes through the styrofoam) so that is ...
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Choosing register value for NTC with voltage divider

I need some help to choose resistor for voltage divider circuit to read temperature using NTC Thermistor. I'm planning to use STM32 with his 12bit ADC. The NTC I'm using has the following properties: ...
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UC3843 PWM Duty Cycle Variation With Temperature

I'm trying to implement a constant current solenoid driver (it's more of a constant wattage pwm driver, current changes with supply voltage which is fine) using UC3843 PWM driver. I'm using the ...
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Intended purpose of temperature sensors inside an IC/microcontroller

What is the intended purpose of a temperature sensor (TS) inside a microcontroller? Of course, you could say it is to measure the inside temperature of the IC, but also depending on the ambient ...
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5answers
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How many times can I solder/desolder a through-hole component on a PCB?

I am very new to soldering and desoldering and want to try doing it on a mouse's switches. I want to try out multiple different types of switches on the same mouse. I read that the temperature limit ...
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1answer
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Help identifying scooter hub motor components related to temperature

I got a Jetson Bio scooter because it was not working (still isn't). It exhibited a notchy hub motor when pushed by foot. After taking it apart I found that the MOSFET for one of the motor phases ...
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How to read and identify multiple (8-15 sensors) temperature sensors for a Pi Pico/Zero?

I'm planning to gather data from several Pt temperature sensors: ...
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How I can perform accelerated testing of my PCB board by own?

I am working on a project in which there are system components listed below as module: 8 ultrasonic sensors 12-30 V (Sensor module) 3 DC motors (Drive module) 35 V to 5 V buck converter and a 35 V - 5 ...
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How can I choose the values of comparator resistors?

I have a circuit that I use as a thermostat: My comparator is an LM393. I calculated the reference voltage and the R3/R4 ratio using the hysteresis calculation tool on this site: calculator So I ...
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1answer
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~3400 ppm/C resistor replacement/substitute?

I am working on reviving an old synth design (Transcendent 2000 for those interested) and the VCO and VCF both rely on high ppm/C resistors to compensate for temperature changes. I can include the ...
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Industrial PT100 temperature transmitter and ESP32 with micropython

I'm building a temperature controller using ESP32s and industrial PT100 temperature transmitters. The transmitter I'm using is this: MUR-HS-U It has selectable temperature ranges and outputs 1-10V ...
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Voltage reference to drive multiple thermistors - high precision with op amp to supply current, or just generic voltage ref?

I would like to drive 8 thermistors in parallel. They will be driven from 2.5V in a voltage divider. This will be about 20mA current draw. I will be using a ratiometric measurement where the ADC ...
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1answer
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Does NTC temperature measurement need calibration?

I'm creating some temperature sensors for home use. To measure outside and rooms' temperatures. Range from -30 °C to +50 °C. Temperature measurement is based on 10k NTCs SDNT2012X103F3950FTF (B=3950K, ...
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Thermocouple wire extension

I want to use a thermocouple (K type) for a PID temperature controller in a heating system. The thermocouple should be pluggable to the system. I decided to use an industrial grade connector like ...
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1answer
46 views

Case temperature MOSFET

I am going to use a nMOSFET (NTMFS5C670NL) which will a varied power dissipation. The current going from drain to source is determined by a control signal. The maximum power dissipation for the MOSFET ...
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2answers
81 views

Why did the output voltage of this circuit had the same value no matter what the value for the resistor R2 was

So here is the circuit: R2 is a NTC thermistor (its value changes with temperature) and i want vout, the output of this circuit, to be in between 0.05V and 4.95V, where 0.05V should correspond to R2 ...
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How to (generally) identify a temperature sensor? [closed]

What should be the approach to figuring out what a temperature sensor is, when taking apart an appliance or “reverse engineering”? This has come up in a couple scenarios for me recently: I am ...
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Calculating the change in output voltage as temperature changes the control feedback resistance

I am trying to calculate the new output voltage when the temperature changes the resistance of the feedback network which sets the output voltage. I have this circuit using the MCP16311/2 buck ...
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1answer
69 views

Analysis of power amplifier bias circuit: does it need to be thermally bonded?

I'm in the process of building a medium power amplifier for the 20m band (14MHz) and I'm experimenting with bias circuits. The amplifier is a classic BJT push-pull arrangement with a transformer ...
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81 views

Temperature is not increasing after some value (MAX6675) (PID)

I was following this circuit diagram shown above (from https://electronoobs.com/eng_arduino_tut24_sch2.php) to create a 12V heater for heating a hot end using PID. The only thing I'm not using from ...
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1answer
40 views

Wheatstone Bridge strain gauge thermal compensation design

I'm designing a full Wheatstone bridge for measuring the bending strain in a steel bar. I have a circuit available to me that uses an ADS1232 to measure the output of the wheatstone bridge. When ...
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1answer
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DALI DT8 tunable white control - novice in need of help!

Completely new to DALI, and I need to control a tunable white luminaire. I have a Hasseb USB to DALI interface (http://www.hasseb.fi/shop2/index.php?route=product/product&product_id=50), which ...
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1answer
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Understanding questions about MOSFET’s drain and gate series resistor

I build a temperature circuit in PSpice with a TLV3701, a MOSFET and 3 light bulbs (\$R_6\$, \$R_7\$, \$R_8\$). The \$R_9\$ resistor is 108.18 Ω (can be bought, I checked). As soon as the room ...
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59 views

Why does gain of my INA2332 change with increase in input voltage?

I'm building an IoT circuit for sensing resistance change using Kelvin's 4 wire. I have implemented a constant current source that supplies my two sensors connected in series with 50 mA. The output ...
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2answers
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MAX6675 k-type thermocouple ADC is giving high readings

I have designed and built a small fairly simple circuit that uses a MAX6675 chip to take temperature readings from a multiplexed array of 16 k-type thermocouples. Datasheets: MAX6675: https://www....
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3answers
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Are Ethernet magnetics temperature sensitive

I am using these discrete Ethernet transformers ALT4532M-201-T001. According to the datasheet, they are rated for -40ºC to +85ºC. In general for Ethernet transformers, would I expect to see some ...
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Using Thermal Epoxy vs Super Glue for Thermal Couple temperature measuring

Which practice is better for measuring the temperature if a MCU on a PCB with a thermocouple: Measuring on the case of the MCU with thermal epoxy attached to the thermal couple, or super glue? I feel ...
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1answer
34 views

Using two thermistors instead of one on battery protection IC

I'm making a battery protection board for a 3S1P pack. I wanted to include two thermistors in the pack to monitor the cell temperature because of how I want to position the batteries. The batteries ...
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2answers
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What are the limits of Peltier cells?

I am doing a project for the university. The project consists of a temperature controller in a glass chamber. The objective is a controllable temperature in a range of 0 - 100 degrees Celsius. The ...
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1answer
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PCB Trace Temperature Rise Model Question

I am reading an analysis on circuit board trace heating, and have found a source for a general temp rise vs current equation that matches measured IPC 2152 closely. However, I am having trouble ...
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1answer
67 views

Pull-up resistors needed between DS3231 and AHT10?

I'm trying to create a datalogger using DS3231, AHT10, ESP-01 and MicroSD Module. So far I noticed that the AHT10 is returning wrong fixed readings: -50 for temperature and 0 for humidity. When tested ...
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Flux to lower solder ball melting point

Is there any such flux? I find the balls on BGAs very hard on my home made oven. From what I gather, mixing up solder types in order to lower the melting point is not the best idea, especially when ...
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4answers
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Is the luminous efficiency of a 5000 K incandescent greater than that of a 3000 K bulb?

The color temperature represents the color of light emitting from an ideal black body, when heated to said temperature in kelvin, and how an incandescent bulb emits light is close to a black body. ...
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1answer
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How can I calculate the power needed to increase/decrease the temperature of an object by x degrees when using a Peltier module?

I am working on a cooling system using 4 Peltier modules. I would like to somehow determine the power I need to reduce the temperature of the object attached to the Peltier module by x degrees Celsius....
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1answer
63 views

Passive temperature limit supervision with electronic readout [closed]

I have a sensor component, which should not be heated over 60°C, otherwise it might start drifting for weeks. I want to supervise the temperature of the component, even if the device it is built in is ...
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1answer
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Shorting potential of bimetallic temperature switch?

I'm looking into temperature switches and came across this type which warns against shorts and instructs you to use a provided plastic sleeve to prevent this. Although I'm linking to a specific ...
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3answers
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Why doesn't the voltage divider rule work with a TMP36 temperature sensor but does work with a thermistor

I recently got an assignment to investigate the relationship between a temperature sensor and its resistance. Because of the lockdown I was required to use simulation. The simulator only has a ...
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1answer
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Is it safe to fix a segment LCD on a panel with hot glue?

I'm talking about an LCD like what is shown in the picture below. Can hot glue applied to its borders damage the liquid crystal molecules or anything else inside it? I searched on the web and found ...
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1answer
63 views

Multiple LM35 temperature sensors with summing amplifier?

I have two big heatsinks with four power MOSFETs on each of them, I want to control the temperature of each heatsinks so that doesn't exceed 80℃ using two LM35 temperature sensors: simulate this ...
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3answers
229 views

Temperature vs diode voltage in Shockley's equation

I was recently tasked with designing a temperature sensor using a general purpose diode. The design uses a constant current source (1mA) for diode excitation. So far, so good. The circuit works as ...
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6answers
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Formula to calculate wattage required to heat stainless steel?

Original Scope: I am trying to make a heating element using a 304 stainless steel flat bar for simplicity. I'm choosing stainless steel instead of nichrome since it will be more durable. If I know its ...
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2answers
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LTspice: Can I simulate current generated heat?

I'm simulating a simple circuit with a resistance temperature detector. I want to know if it is possible to simulate the small change in the resistance as the current flowing through the resistor ...
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1answer
81 views

To minimize the power loss in MOSFET of current control circuit

I am going to measure the electrical response (voltage drop vs current) of an electrical contact joint modeled as resistance 0.4 ohm in following figure. I made a prototype circuit to control the ...
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2answers
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Missing and insufficient data read from embedded BMP180 pressure sensor in motion [closed]

We're building an avionic system which will fly onboard on our rocket. And we have embedded BMP180 Pressure Sensor on our avionic system and we want to get smooth data when it is moving. Our BMP180 ...
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0answers
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STM32L4S9 low temperature FLASH memory programming

As there is no information on the internet I hope that I will not have any problems (as there are no complaints :) ). My device will receive OTA updates and my question is: Did you have any problems ...
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2answers
54 views

Power conversion to temperature formula

When an electrical shortcut happens at a wire, the wire heat up to melting point example Is there a formula to calculate temperature reached?
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Understanding the resolution of the DS18B20 - mismatch between specs?

I am interested in the DS18B20 temperature sensor from Maxim Integrated. The datasheet is here: https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf The datasheet mentions: "Measures ...

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