Measuring speed and distance
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Revision as of 23:06, 9 December 2010 by JulienB (Talk | contribs) (New page: {{Under_Construction}} On this page you will find informations to measure speed and distance of a vehicle, with an APF27. ==Principle== On one wheel of your vehicle, you will have a ...)
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On this page you will find informations to measure speed and distance of a vehicle, with an APF27.
Contents
Principle
On one wheel of your vehicle, you will have a system with some holes that will generates a square signal. Each pulse will correspond to one or more turn, depending on the precision you need. == a kid of tachymeter.
You have to adapt the signal level to 0-2,8V and limit the overshots.
Then, you will be able to inject on the TIN input of the APF27. This is only possible if you have an APF27Dev without HDMI chip.
The TIN input is internally linked in the i.MX27 to some counters that we will configure and use to count the signal pulses.
