#Cadence plot one waveform divide another portable
A passenger monitors the pulses from the sensor and notes their frequency - this normally requires a portable oscilloscope, of course. Start at, say, 10kph and go up in 10kph jumps. Second method: On a long, straight, empty road, use a GPS to measure your speed. Then you will know how many pulses you get for each turn of the wheel, and you have all the information you need to make your speedometer.
#Cadence plot one waveform divide another full
It helps if there is another person who can monitor how many pulses are produced by the sensor as you push the car along for five (or whatever) full revolutions of the wheel. Then, when you know the RPMs of the wheel, you can calculate the speed. Divide by five to get the distance travelled per revolution of the wheel. Then measure the distance between the lines with a tape measure. After (say) five turns, line the valve up at the bottom and draw another line. With the steering straight, push the car along, counting how many times the wheel turns. It helps to mark a line on the tyre, next to the valve, for even better accuracy. Mark the ground with a chalk line - this represents your starting point.
Choose which wheel you will observe, and push the car until the valve is exactly at the bottom of the wheel. There are two ways to deal with this, and I've done both (although on a motorcycle).įirst method: put the car on a large, flat area of ground (like an empty car park).
I am trying to do it by dividing the distance (circumference of the wheel) by the time it takes for 1 rotationĪctually this is quite inaccurate, because the tyre is flattened at the bottom, so the radius is not what you would expect it to be from the wheel's circumference.
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