Temperature is a property of a substance related to the amount of heat energy it contains.
-1
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0answers
39 views
Temperature sensor issue [closed]
I am implementing home automation using an MSP430F2274. For that I need to read a temperature sensor and send the values to the receiver side. Please suggest any manuals to write code?
5
votes
2answers
90 views
What is the minimum temperature for FR-4 PCBs?
My company is working on developing a product that will go into commercial freezers, so my boss asked me to provide operating temperature specifications for the product. I can find "operating range" ...
2
votes
2answers
126 views
Expanding Range Of Analog Values From Temperature Sensor
I'm trying to build a temperature controlled relay module with an ATtiny45 ( Arduino UNO R3 as ISP ) and a NXP KTY81-222 Temperature Sensor.
The temperature range i want to monitor is 20°C to 30°C.
...
4
votes
4answers
173 views
Ideas for a cheap, simple, common temperature sensing component?
I'm looking to make a device to regulate a heater to maintain 100-110 degrees Fahrenheit in a small, moderately insulated container. Specifically, I'm wondering what I might have in my parts drawer ...
1
vote
1answer
77 views
What is the temp velocity of Nichrome?
I have read here and here that nichrome of a certain gauge requires a certain amount of amps to reach a certain temp. e.g: 30awg nichrome requires 0.92Amps to reach 205 Degrees Centigrade. With 1 foot ...
3
votes
1answer
93 views
Temperature current source using a LM35
Anyone care to explain how this piece of circuit work?
I already build it and it works wonders but I can't figure it out.
0
votes
3answers
80 views
Modifying a digital LED thermometer kit to drive larger 4" 7-segment LEDs?
I'm interested in building an LED digital thermometer with 3 or 4 large 4"/100mm 7-segment LED display digits (for example, Kingbright SA40-19EWA). There are plenty of kits available which come with ...
-1
votes
2answers
97 views
How do I calculate the voltage needed to heat up a wire to a certain temperature?
The wire I am using is standard temp. nitinol wire which needs to be heated up to 45 degrees Celsius in order to be effective (move). What voltage do I need to achieve this?
1
vote
2answers
117 views
What kind of Relay Reacts to Ohms?
I need to connect a relay to my old truck to turn on the "soon to add" electric fans.
The ECM has an engine coolant temperature sensor that uses the output resistance to determine coolant ...
0
votes
2answers
581 views
Arduino controlled PWM PC Fan
I am looking at getting 2 Evercool EC8015HH12BP 80x10mm (4-wire) PWM fans. However, i am looking at controlling the fan speed with the arduino via the PWM pins.
I found the following diagram that ...
3
votes
2answers
125 views
Designing a Low Power wireless temperature transmitter
I'm going to work on a project in which I need to take your experienced into consideration to which path should I go to.
I need to design a wireless circuit at max size 5*2CM, that has a thermostat ...
3
votes
1answer
100 views
Transistor varies with Temperature
My questions pertains to the \$ \beta\$ value of a transistor. On page 162 of this book, it says that \$ \beta\$ increases as temperature of the transistor increases. But it doesn't explain why. Can ...
1
vote
1answer
68 views
1-Wire sensor to high temperature about 200 C
I'm using 1-wire network temperatures in the furnishing and now
I would like to measure the solar thermal collector in the upper end of the temperature of 1-wire sensor attached to the network. But ...
9
votes
1answer
134 views
Max operating temp of IC's
Why do so many IC's have a max temp range of 125C? Is it due to packaging material tolerances, ie the black plastic enclosures and/or the bonding epoxy that holds the die to the package and/or ...
2
votes
1answer
138 views
LEDs for high temperature applications
I need a LED in an application, where the temperature cycles from 0 - 125 degree C.
All I can find is LED´s that goes to 85 degree C, can that be true?
0
votes
2answers
185 views
Temperature limit on Soldering iron\heating element
I am trying to design a soldering iron type of tool that will not heat-up past, lets just say 400 degrees F.
I know I can get a PID controller and manipulate the temp, but I'd JUST like the unit to ...
3
votes
3answers
154 views
What easily acquirable material changes its resistance when heated?
I'm trying to build a Resistance Thermometer that varies current/voltage output when heated. It has to be DYI, I don't want to buy anything done, only something like a light bulb, and this has to be ...
4
votes
4answers
190 views
How can I seal a temperature sensor against water?
I have some DS18B20temperature sensors around and was wondering how can I seal them and use them in a water tank. The sensor must include a small resistance (140 k ...
-3
votes
1answer
126 views
How high charging temperature causes damage to AA size NiMH cell
I used a portable thermometer and put on top of a battery charger. I notice that the temperature reach 39 degree Celsius and I can feel the warmth when I put my hand on top of the charger & the ...
5
votes
4answers
183 views
Temperature sensor recommendation
I am builing a homemade reflow oven, but I cant find a good and cheap temperature sensor that can survive the temperatures necessary for reflow (~250ºC or 482ºF).
Does anyone have a recommendation?
I ...
0
votes
1answer
74 views
RTD 100 hooked up to Lee Dickens BD-300 Isolating Signal Converter, Issues Reading the Output
I have a three wire RTD 100 probe and a BD-300 Isolating Signal Converter. I wired up the BD-300 like the datasheet said to, and the unit powers powers on and indicates that it has power (red LED is ...
0
votes
0answers
71 views
Alter a temp probe for an interactive prop
I have been tasked with building an LCD or LED that says 78 Degrees and changes to the celsius equivalent with the push of a button. This is nothing more than a prop that kids can use to simulate ...
4
votes
4answers
233 views
PID regulator steady state error problem
I'm working with a PI controller that regulates temperature through a pwm duty cycle.
It generally controls well. However, the system requires a certain minimum duty cycle to balance the heat loss. ...
2
votes
1answer
86 views
LSD NiMH cells that provide reasonable capacity even in subfreezing temperatures
Sanyo claims that 2000 mAh Eneloop LSD AA NiMH batteries provide about 1400 mAh at -10 °C (-15 °F).
I wonder if only Eneloops provide reasonable capacity in the cold, or if the competition does too. ...
4
votes
3answers
201 views
IC's operationg at high temperatures
I was reading an article yesterday about circuits and IC's in deep space and how they need to be operable at high temperatures. A few questions popped up when I read this article. Today there are many ...
4
votes
2answers
280 views
Can I use a DC SSR that is switched by a PID controller to control the speed of a 12 V DC fan?
This is my first post here. Let me start by saying that I do not have an engineering background. I tinker with electronics in my spare time (Arduino, solid state low-power guitar amps, etc.), but I do ...
7
votes
2answers
354 views
Selecting bias resistor for thermistor
Rt is thermistor. Rb is bias resistor, which value I need to calculate. The temperature that I'm interested in is giving ...
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vote
2answers
453 views
Exists an Arduino compatible temperature sensor with effective range of approx 1 meter?
I saw this fictitious product on the web and was impressed: http://www.behance.net/gallery/Sprout-Infant-Monitor-System/4033245 However, as I said the product does not really exist, but the seed is ...
1
vote
2answers
257 views
Using an LM34 temp sensor, how can I limit the range of temperatures?
Over the next two weeks, I'm going to be building a greenhouse fan system. It's not for a real greenhouse, though. It's just for fun. Anyway, my plan is to use the Dragon12+ board that I have, an ...
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votes
1answer
74 views
Math: Temperature tranform equation [closed]
While reading the MAX6605 datasheet, which is an analog temperature sensor, I ran across the following:
The temperature-to-voltage transfer function has an approximately linear positive slope and ...
3
votes
3answers
243 views
Creating a low (90-250F) temperature-controlled soldering iron (or modifying a higher temp one to get lower temps)
I'm a wax sculptor and am interested in getting a temperature controlled soldering iron but I need a very low temperature range (like 100-250F). Most units come with a bottom end of 350F+. Is there a ...
0
votes
2answers
135 views
Dual cooling system for lithium ion battery pack
My project is about making a system to control the temperature inside the battery pack for an electric car. Fan / blower will turn on automatically if the sensor reads a temperature more than ...
2
votes
1answer
234 views
How can I determine the resistance needed to heat a wire to a specific temperature? [duplicate]
Possible Duplicate:
How do I calculate the temperature rise in a copper conductor?
I want to have a AA battery heat up a copper wire .12mm diameter, but want it to heat up to 302°F, not ...
4
votes
3answers
307 views
How can I find temperature of microcontroller?
In some boards which environment temperature goes up could cause high temperature in micro controller. This will effect on micro and bad situation maybe occurs. For example I have designed a device ...
1
vote
1answer
320 views
pH sensor with DS18B20 temp compensation on PIC
I am trying to build a circuit that interfaces a standard pH electrode to a PIC (18F4550). I need the PIC to also use a DS18B20 for temp reading and use that data to correct the pH reading. I ...
1
vote
3answers
206 views
What parameters effect on voltage regulator's temprature?
What parameters effect on voltage regulator's temperature? Is it current of output or another parameters effect on temperature? For example if a lm7805 is used for current output of 1A and 18 volt ...
6
votes
1answer
131 views
Why do standard cells typically have slower timing with high temperature, and faster timing with low temperature?
Threshhold voltage typically falls with increasing temperature, which would seem to indicate that high temperature operating conditions should result in faster gates than low temperature OCs. However, ...
17
votes
4answers
706 views
How can I measure the temperature wirelessly inside a piece of meat?
For a cooking experiment, I'd like to be able to measure the temperature inside a piece of meat while it's being cooked. Due to the mechanics of the cooking process, it's going to be difficult to use ...
3
votes
1answer
133 views
Maximum current vs temperature
I am using a 24V - 175A generator and I would like to use 37 meters of wire for my charging circuit. The voltage drop need to be less than 2V.
I did some calculations with the American Wire Gauge ...
2
votes
1answer
170 views
Controlling temperature of a water bath with induction plate
I am thinking of building a sous-vide cooker using some kind of prebuild heater, controled via an AVR and temperature sensor like the LM35. There are a lot of references around using rice cookers, ...
2
votes
1answer
243 views
Is there any accurate Temperature, Moisture or pressure reading strip?
I was wandering if there is any such sensor, that would read pressure, temperature or moisture ( approximately 12 inch long strip)? I want to be able to dip this sensor into water and have it be able ...
2
votes
1answer
124 views
How to make a device that keeps water in sink and bath at desired temperature?
I have tight taps in my sinks and bathroom which are difficult to control — it's either too hot or too cold and never easy to manually set the preferrable temperature. I'd like to solve this old ...
2
votes
2answers
164 views
How can I make a thermostat?
I would like to make a threshold-temperature on-off switch (a.k.a. a thermostat). Short of buying a commercial sensor like an LM335Z (I know that it's super cheap) and figuring out how to use the ...
3
votes
3answers
243 views
Making a burglar alarm
I am using a passive infrared sensor TMP006 to make a burglar alarm. However I notice that the data returned is not accurate enough. Are there any other ways by which I can improve my accuracy. Or ...
8
votes
2answers
719 views
Controlling an RGB LED color range from an analog temperature sensor (no Arduino, etc.)
I'd like to combine an analog temperature sensor with an RGB LED so that I get a range of colors based on temperature. Low temperature blue, high temperature red, with color fade between them as the ...
1
vote
2answers
1k views
Temperature sensor (TMP36) inaccurate readings
I've got a TMP36 temperature sensor of which I'm trying to read the value of using an Arduino Uno. I know that the sensor has an accuracy of -/+ 2 degrees celsius but my readings are peak far past ...
2
votes
1answer
282 views
Why does the base-emitter voltage of a BJT decrease with temperature?
According to Sedra/Smith Microelectronic Circuits, \$v_{BE}\$ changes by \$-2\text{mV}/\text{°C}\$. I cannot understand how this could possibly be the case given the equations I am familiar with.
...
26
votes
3answers
1k views
Minimum operating temperature - Outer Space?
I've been looking at some microcontrollers and I've seen they've got some "weird" minimum operating temperatures, like -25 degrees or -10 degrees etc. But I can't really understand why there is a ...
6
votes
5answers
740 views
Cheap temperature sensing with MCU
I am looking for a cheap solution for sensing temperature with a MCU. My requirements are:
2 channels
temp range: 30-35°C
temp resolution: 1-2 K
cable distance (MCU -> sensor) 10cm - 2m are ...
3
votes
2answers
1k views
How to add temperature control to a soldering iron
I see lots and lots of builds of "temperature controlled iron" that simply either:
adds a timer to an uncontrolled iron
adds a dimmer to an uncontrolled iron
The first is the same as turning on ...
