Questions tagged [temperature]
Temperature is a property of a substance related to the amount of heat energy it contains.
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NS9750 operating temperatures
I have a ticketing device with an ARM9 CPU, more specifically a NS9750 module.
In the datasheet, its operating grades/ambient temperatures are listed as follows:
125 MHz: 0 to 70ºC
162 MHz: -40 to +...
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how to calibrate temperature sensor IC DS1621?
I have made temperature indicator using microcontroller P89V51. My temperature sensing IC is DS1621. I'm using LCD for the display..n ckt is working very fine,
Do I have to calibrate this IC?
If yes, ...
user3633
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Using K-type thermocouple to measure human body temperature
Is there anything I need to he aware of when using K-type thermocouples?
I got the idea by touching the probe. I can get a reading when measuring temperature for 30 seconds using a DMM. A commercial ...
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Temperature sensor for Linux [closed]
I'm looking for a temperature sensor, that can be connected to a computer over an interface that is ubiquitous, like USB. I'd like to read the temperature data over the command line.
Any suggestions ...
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Regulator cooling in a confined space
I've designed a simple PWM RGB LED slow fader to be used as a garden lighting effect. My circuit works great, but I under-estimated the amount of heat that is generated by the 7805 linear regulator.
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How do I measure a PT100/1000 with a Arduino over I2C?
How do I measure one or more PT100/1000 (PTC Resistor) with a Arduino/ATmega328 over I2C?
Are there any ready microchips? Do I need to construct my own circuit? If so, are there any ready schematics?
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LM317 getting hot
Should an LM317 (specifically a TI LM317MQDCYR) rated for 500ma output current really be getting hot to touch when only pulling 170ma at 5V?
Package is SOT-223, input is 9V.
Is this normal?
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Any issues with using an opamp as a constant current source for temperature sensing?
I understand that most people use a bridge circuit for RTD and possibly thermistor temperature sensing. I'm trying not to do that for several reasons.
I'd like to use an opamp in the classic ...
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How to calibrate a temperature sensor
I am using an LM35 temperature sensor, which produces an output of 10.0 mV/°C. My circuit will handle temperatures up to around 90C
What can I do to check the LM35 output, and maybe fine tune it for ...
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Measuring temperature of microcontroller and other large ICs
I'm going to be using a microcontroller and SDRAM IC in an enclosure that could, given some environmental variables that I have no control or knowledge of, get too hot for the devices to work properly....
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More Options for Reading Thermocouple Signals
I've tried a few options for reading the signals from thermocouples over the years.
The cheapest way (component cost) is likely to be DIY, and a lot of work involving lots of analogue stuff that I'm ...
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Building a temperature-controlled water bath
I want to build an accurate (±2 °C) water heater (sous vide) that heats water somewhere between 30-100 °C according to user input.
Although I have an engineering background I have no ...
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What is 'best' temperature sensor for an array of sensors
I'm looking to make an array of sensors to record the temperatures in a house at various points
eg. Above flat metal roof,
inside flat roof cavity (above 1st floor),
ceiling of room (1st ...
user2842
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Cheap way of temperature testing my boards
I want to make sure my product will work over a large temperature range of -40C to +75C. I can verify on the low end down to about -18C using a household freezer (which is probably good enough) but I'...
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MSP430 serial communication failing in cold weather
I have a product using the MSP430 microprocessor, which has been selling for a couple years now. One of the MSP430's jobs is to communicate over async serial to a low-power radio.
With the onset of ...
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Is there any reasoning behind making capacitors go to 105°C?
Electrolytic capacitors are often rated -40°C to +105°C. I've always wondered about the extra 5°C. This also seems to be the temperature range for some types of microcontrollers, and is marketed as an ...
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What prevents semiconductors working below -40°C or so?
Most devices seem to be characterised over -40°C to ≥85°C. What limits them to cold temperatures? Can an IC be damaged by keeping it too cold? Does this apply to other devices, e.g. diodes, ...
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How does temperature affect voltage references, resistors etc.?
I have a 0.1% 3V reference with a temperature coefficient of 100ppm/°C.
Does this mean it will be off by 8500ppm (0.085%) on top of my 0.1% when operating in an environment at 85°C?
Does something ...
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Why the difference between maximum junction temp (150°C) and storage temp (165°C)?
Many integrated circuits I have seen have the specification of maximum junction temperature (150°C) but storage temperature is invariably higher (165°C) and often lower, e.g. -55°C. Why the ...
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What limits most integrated circuits to 150°C junction temperature?
As in the title. What limits most integrated circuits to 150°C junction temperature?
I know it's not good practice to run chips very hot (as it shows you are wasting a lot of energy) but I'm curious ...
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ISO Example Home HVAC Control Schematics and Circuit Design Info
I am currently interested in determining how a home thermostat controls a home HVAC unit. I have run into plenty of schematics that can control a HVAC window unit, walk in freezer, water temperature, ...
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Good board for DIY temperature control/readout
I want to do a project where the temperature of a device is controlled by toggling on/off a heating element (120VAC),presumeably by using a relay. I would like a board that has an input for a ...
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Small batteries for use in cold (but not freezing) environments?
I'm building a small, low-power device that will be used inside a standard consumer refrigerator (approximately 2°C). I've had trouble with Alkaline batteries at low temperatures, and was wondering ...
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LM335 doesn't seem to work
I'm relatively new to electronics, and I'm trying to make a thermometer using a LM335 temperature sensor. By reading the datasheet I thought it was simple, connect up 5V to a resister, then to the V+, ...
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What’s the proper soldering iron temperature for standard .031" 60/40 solder?
I recently purchased a Weller WES51 soldering iron as my first temperature controlled iron and I'm looking for recommendations on the best default temperature to use when soldering.
I'm using mainly ....
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wireless temperature sensor [closed]
Are there any low-cost (<50$USD) wireless ambient temperature sensors available?
I would like a simple to interface to the sensor i.e. IP over Wifi if at all possible.
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Waterproof Temperature Probe
I'm looking into building a temperature monitoring system, and I want the sensor to have the ability to be submersed into boiling water. Can a thermocouple handle this? I'm looking into this one now, ...
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Reading RTD Temperature Sensor
I've had a number of issues getting good stable analog readings from an RTD temperature sensor. The temperature readings have a tendency to bounce as much as +/- 5 Deg C. The circuit is very basic, a ...
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What is the minimum supply voltage for an LM335?
The answer to this question is probably staring me in the face, but I just can't see it. I'm attempting to interface with an LM335AZ temperature sensor (datasheet) at 3.3V. The datasheet clearly ...
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Reliability of DS18x20 temperature sensors
I'm using Maxim's DS18x20 (I've actually got more than one variant) 1-Wire temperature sensors to log the temperatures in various rooms in my house once a minute. About one reading in a thousand, I ...
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High Temperature Humidity Sensor [closed]
Where can I get a high temperature humidity sensor for temperatures up to 700 or 800 degree Fahrenheit (~ 370 or 425 °C)?
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BlinkM temperature indicator
I want to build a BlinkM as a simple temperature indicator as seen at
http://thingm.com/products/blinkm/project-gallery.html
Anyone know where I can get a schematic & parts list? The link on the ...
Jules
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Best humidity/temperature sensor for a nappy?
Special needs kids have big troubles with potty training. A 'wee-wee' alarm would be of a lot of help.
What would be a good way of detecting 'it' without electrocuting anybody? A possibility would be ...
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