Hello All! I need to build a device like this: there is a chair whith wooden seat (no upholstery). When somebody sit down on this chair electronic devise must...
Can you remove the seat altogether? If you can, then you can put 4 little switches between the legs of the chair and the seat. Capacitive sensors is another...
... 4 ... A chair is not buyed yet so i don't know a construction. In any case it's quiet difficul for me to install swithes under seat. It is need to install...
A thermal sensor would be easy, but slow. You could use a strain gauge glued to the bottom of the seat to detect distortion due to weight. Or how about the...
... is broken it would trigger the sound chip. ... Using IR sensor not so good idea because IR LED will quickly dicharge battery. Solution must be battery...
I'm begining to build an ROV and I need help deciding/aquiring which sensors I will need to add on to it. I am also a poor college so cheaper is better. The...
For ultrasonic transducers look at depth sounder transducers at your local fishing tackle store. The one Nick suggested looks just like the ones meant to...
I'm doing some research on data reconciliation. I'm working on robust state estimation based on sensor measurements. My problem, ironically, is that I can't...
It is possible to make a piezoelectric pressure sensor from a axial monolithic ceramic capacitor. One could make four of these and glue one under each of the...
How about clipping? or impulse noise like comes from spark plugs or radar? or thermal sensor drift or aging? Then there is digitization noise from limited A/D...
if your going to buy the LM200 your local dealer is phil jackman tell'em jake sent you. HTTP://www.advantagetms.com ... The cheapest enclosed underwater...
Alexander, You can make a capacitive measurement with very simple hardware. You might need only a square wave generator, a diode and a capacitor. The ...
It also may be a solution but capacitors can be crashed by weight of big man/woman :) And I don't like to use elements in unprovided modes of operation because...
Wow, You are real enthusiast! Thank you for experiment! One thing i don't like in this solution - current consumption. If I will use LM 555 fot generator, it...
Here’s a couple of thoughts: - You can generate the excitation square wave with a microcontroller (uC). Probably, the frequency can be made lower than ...
Have a number of RTD sensors at hand. Do you have any idea of introducing likely EMI or harming sensor insulation to get the job done...? To Douglas, thank you...
For store audio I plane to use ICD2560 or some old MP3 player :) if quality of sound of ICD2560 will be not enough for my customer. I don't know easer way for...
Clipping is when something in the sensor system goes non-linear. An obvious case is when an amplifier output saturates or an A/D reaches 0 or full scale. But...
... common EMI source... What kind of instrumentation do you see Radar noise in, Doug? At what powers? Where are your devices located onboard? I'm up to my...
I see Radar interference mostly with 300kHz sonar receivers, though I have also seen it in fast platinum RTD sensors. The sources are mostly moderate sized...
... You see Radar at distance in submerged instruments? Most interesting. I'm in a private conversation about underwater RF propagation, as it happens, and...
I am curious about how you solved (and, therefore, identified the path of) your Radar interference problem, Doug. Are you certain that the signal was not...
OK, with my DAQ cards, I find it difficult to tamper my noise. So I think I will try introducing EMI, since as Doug wrote, EMI can cause flyer or outliers,...
I am fairly sure the RF was entering the sonar equipment through cabling. Our long baseline navigation system has a number (like 6 to 10) sonar transceivers...
Anything that makes a spark should be a good source of EMI. A small Tesla coil would be ideal. A gas grill igniter, a gas weed-whacker, a hand drill with a...
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