Recent content by MagicianT

Arduino DUE based project for testing amplitude-phase response of the sensor or circuitry. Resonance frequency detection based on zero phase crossing, range up to 250 kHz. Check it out : https://coolarduino.wordpress.com/2014/12/24/lcq-meter-amplitude-phase-characterizer-piezo-tester/...

For video your sampling rate is frame rate per second, or fps 24, 30 etc. Size of the image is second derivation in this case, and it defines ADC conversion rate in elements per second, when all elements taken in the same time snapshot. Over- and under-sampling has same effect as in 1D , you...

To measure a freq. you have to count pulses over specific period of time , "gate" time. This period can't be too long, I'd think at least no more than 100 milliseconds for biological process, to keep update rate 10 Hz or so. This implies error in measurements, +-10 Hz. But if you measure a...

There are Walsh series, essential part of encrypted digital communications http://en.wikipedia.org/wiki/Walsh_function

Agree, I missed this out. Same time sonar term sounds too specific, related to underwater localization. Tracking object in the air brings radar to mind True, but all of them industrial or military. I don't know any research on small, "hobbyist" scale, with a budget < 100$. New video posted...

I'm working on arduino based project, that actually can perform 3 features: 1. Virtual Touch Screen, for remote control purposes big screen TV, projectors, public display, or for interactive games 2. 3D Ultrasonic Radar, small range - 3 m for now, but real time with update rate 50 fps; 3...