For this measurement the digital input/output terminal of the DrDAQ must be used, which gives a PPS measurement: pulses per second, or Hz.
But I am of the opinion it is not possible to measure the speed of a wheelchair with the DrDAQ and Picolog because with these it is possible to reliably measure pulse frequency down to 1 Hz, but the resolution is one Hz only: e.g. you can see 1 Hz, 2 Hz.......10 Hz, 11Hz and so on, but NOT fractions of 1 Hz. I am enclosing the Wheelchair PDF file that calculates frequency Vs. speed with a wheel of 817 mm diameter. As you can see, for speeds of 1.1 to 7.7 km/h frequency is only 0,117 to 0.83 Hz.
Even using a 0, 1 diameter meter wheel (dia. = 82 mm) coupled to the main wheel, frequency range increases to 1.17 - 8.8 Hz, but the DrDAQ would only show 1, 2, 3 ... 8 Hz and nothing in between, giving very bad resolution....
- Wheelchair frequency/speed
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