hi! ... thanks :-) ... Well I am actually sampling using the ADC peripheral of a microcontroller (Texas Instruments MSP430F2013) and so, the sampling frequency...
... The pulse is basically a weak mechanical effect, an area of skin rising and falling as function of blood flow pressure. Piezoelectic transducers can detect...
There are a couple of questions to answer first: 1) Is this noise electrical or mechanical? With Piezo's you need to know which type of shielding you need. 2)...
Hi All, I want to know whether is there any difference values between pressure measurement values from electronic sensor at exactly same place if one is open...
Power factor could be a problem with the solution of sampling at 50Hz zero crossing. Phase shifting of current or voltage will never give you a real zero...
... There has been a fair bit of research on re-purposing common signals. In such context they are sometimes called "signals of opportunity". For example, GPS...
Hi Nick, the weblink you posted seems to be removed already. But it is nice to know that people are investigating a second use for such electromagnetic...
hi! ... That's it. The sensor itself acts like 2 different capacitors connected to the sensing circuit. The reason for using 2 was to have it balanced, so I...
The "balanced" statement here only works if "both" sensors (antennas) are exposed to the same electric noise, what is not your case. The fact that each...
I understand you are trying to pick up blood flow pulses on the wrist, right? I also understand you are using a piezo microphone, not a buzzer. Am I wrong? A...
good day sir, i am really having trouble with my ultrasonic device, the transistor sl100 is not available, i am hoping you guys could help me find a substitute...
Folks, I am about to make a simple thermocouple based on an LM358 as found at http://www.5bears.com/circuits.htm#Circuit%2002 and wonder if there are other...
hello i am making a line follower robot,and need to interface an IR sensor for sensing the line,i have decided to use op amp LM 339 i used a 5v supply...
The LM339 is not an Op-Amp, it is a Comparator, its output is open-drain, requires a pull-up resistor at output. The Photo-Diode used inverted acts as a...
hey all, im using a webcam and want to interface it with mega16 but i want to avoid setting up a seperate USB host for connection, is it possible to make...
deal all, I would be glad if you can supply me with the theory of operation , circuits , design of a metal detection door because i need to design one please...
If you never programmed the AtMega to do USB job, then it is a long time learning protocol and tricks. It is NOT a simple and easy task to be done in a couple...
A metal detector gate is composed by an electronic oscillator and the antenna at the gate. The antenna in fact is a wire coil, that makes part of the...
im working on a study that requires an air pressure sensor which reads just about below the atmospheric pressure... is there such kind available in the market?...
Sure--there are a wide range of pressure sensors with about any range and sensitivity you can imagine--from vacuum to megapressure. Check out Omega.com for a...
If it does not have to be electronically readable you can use a manometer. That is just a clear U shaped tube with some colored water in it and a scale...
Hi all, I'm new to this group and am looking for help with specing a proximity/presence sensor for a piece of video art. I'm a software engineer working with...
An ultrasonic sensor CAN work for your application, but ultrasonic sensors are very sensitive to changes in the enviroment. Most enviroments change slowly, at...
Something I forgot--if you are set in using ultrasonic sensors, pretty much the gold standard for them is the Polaroid sensors. They use some unique...
hi, do you guys have any code for interfacing Parallax ping ultrasonic sensors with pic microcontroller regards ... [Non-text portions of this message have...
... I've had some good results with the SRF08 module shown on this page: http://www.robot-electronics.co.uk/acatalog/Ultrasonic_Rangers.html We were using them...
Hi David, Thanks for your info, it gives me some other options to think about. As for capacitive sensing, I worry that I wouldn't get the range I need - 18 to...
Hi Asher, Thanks for the info, it's great to hear about a sensor you've had success with. I'll check it out. Can you point me in the direction of information...
You can use thermal sensor, or image sensor, or pressure sensors, or the best; IR Radar. Thermal would measure person's temperature in the designed area, when ...
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