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I am trying to put together a compact temperature control instrument to be placed inside a small chamber. For this I would like to buy a PID regulator, preferably with a sensor (Pt100) input and a relay output to switch a battery on/off. The difficult part is that I only have a volume of about...

Good idea but I have already built a complicated sensor system with 24-bit AD outputs from 10 channels. The sampel rate is almost 3kHz, so there is a ton of information. I start out by storing it on a SD memory card. Then I transmit this to my laptop but my current BlueTooth connection is sooo...

Thank you everyone. Your suggetions collect to a nice wireless library. Unfortunately, no cigar yet because either the protocol is way cumbersome to implement (USB stuff) or the speed is too low (Lantronix, Aerocomm, BlueTooth). I guess my application is too difficult for commercially available...

Thanks a lot for the advice. I will check if I can squeeze the Lantronix box in or if the USB adapters will work for us. This gets me going.

I need to fit a WLAN transmitter into a tube, with inner diameter of 27mm or just over one inch, to transmit a lot of sensor data to a stand-by computer. The performance does not necessarily need to be stellar, 10Mbit or higher, and I can build my own circuit board to connect a set of chips...

Thank's alot for this help!

The formal specifications are easy to satisfy: range of 0-10m of H2O with a resolution of about 100mm H2O. The hard part is to operate autonomously for 10 years, on a battery. Hence, the sensor must have a fairly stable offset and also not be affected by barometric pressure changes...

My problem is to measure the water depth of ocean water, but only when the battery operated sensor unit is submerged. The sensor unit must operate on very little power and autonomously so I don't have information about when it is submerged, splashed on, or when it only reacts to barometric...

A thorough solution to your problem requires solving the heat diffusion equation. You probably need to solve the time dependent equation. The easiest way of getting a useful solution is a numerical solution, hence using computers. Someone mentioned that there is software to buy and that may be...

I am searching for a material that can fill the space between circuit boards carrying sensors and electroncs. I need to control the thermal gradients, both in space and time, between the various sensors and their electronics. Hence, the material must be electrically insulating. Another major...