Tagged Questions

3
votes
2answers
88 views

A heat sensor that powers an LED with no controller

I'm a programmer, and I can wrap my head around having a controller board which monitors a temperature sensor llike this ...
2
votes
2answers
164 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
226 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 ...
3
votes
1answer
123 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
162 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
vote
2answers
969 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 ...
4
votes
4answers
214 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 ...
5
votes
4answers
188 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
0answers
73 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 ...
1
vote
2answers
466 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
274 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 ...
-1
votes
1answer
75 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 ...
0
votes
2answers
137 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 ...
1
vote
1answer
325 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 ...
2
votes
1answer
248 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 ...
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 ...
6
votes
5answers
756 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 ...
2
votes
1answer
280 views

Finding a sensor for vibration of impact event, preferably for interface with arduino

Vibration Sensor, I want a really high tolerance, I intend on using this to measure the vibration generated when dumbells are thrown onto the floor in a gym. Because, I have familiarirty with the ...
0
votes
1answer
445 views

TMP36 x Voltage input in arduino

I have a project, using a temperature sensor, TMP36 and Arduino. Basically its a bluetooth thermometer. Everything worked fine at breadboard and connected and energized by my notebook. Now I connected ...
1
vote
4answers
1k views

How to find out the voltage on Arduino ADC input?

I am a complete beginner in the field of electrical engineering. I have this temperature sensor with 2k Ohm resistance on 25°C. I have wired it parallel to a 3.6k Ohm resistor to lower the overall ...
2
votes
4answers
378 views

What are some methods to achieve constant LED brightness over large temperature ranges?

I would like to regulate the light flux output of an LED or laser diode over its entire operating temperature range by varying the current. What are some different methods to achieve this? Edit: ...
1
vote
2answers
1k views

What waterproof temperature sensor do I need to measure water temp using an arduino mega?

I consider myself a complete novice when it comes to electronics. My current project consists of measuring water temperature using an arduino mega. What parts will I need to complete this project? ...
4
votes
4answers
1k views

Differences between thermistors and thermocouples

As I understand it, both thermistors and thermocouples are temperature sensors. So what are the advantages/disadvantages of using one over the other to measure the temperature? What are the specific ...
5
votes
5answers
1k views

Can I improve the accuracy of LM35 temperature sensors by averaging several sensors?

Can I create one super-sensor by averaging together the readings from several LM35 sensors? Wouldn't this be more accurate because I'd be averaging out the systematic bias in the individual sensors? ...
1
vote
2answers
362 views

Reading back 0xffff for temperature from I2C BMP085 temp/pressure sensor

I'm interfacing a Rabbit 5760 CPU to a Bosch BMP085 sensor via I2C. Everything is fine except reading the temperature register is reading back 0xffff (see BP_FINISHTEMP case in switch). I can't see ...
0
votes
2answers
472 views

Why LM35DZ temperature sensor accuracy deteriorates towards the lower end of the range?

I get some curious data from my LM35DZ temperature sensor. Every minute or so I take 8 measurements 1/2-second apart and average them. The graph below shows that the accuracy of the measurements ...
4
votes
3answers
373 views

Getting temperature data from traditional pizza oven

I'm building a traditional Italian pizza oven in the back garden and would like to get some temperature data back to my home computer. The major requirements for such a piece of kit are: Record a ...
1
vote
6answers
1k views

Temperature sensor for Linux

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 ...
2
votes
2answers
493 views

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 ...
3
votes
4answers
3k views

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 ...
3
votes
3answers
278 views

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 ...
8
votes
6answers
3k views

wireless temperature sensor

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.
4
votes
11answers
2k views

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, ...
4
votes
4answers
2k views

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 ...
4
votes
2answers
2k views

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 ...
3
votes
4answers
313 views

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 ...
7
votes
3answers
503 views

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 ...