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Subject: Re: vechile speed meter
Date: Thu, 14 Nov 2002 17:01:49 +0100
NNTP-Posting-Date: Thu, 14 Nov 2002 16:08:28 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
I'm already use a unit with proximity sensor connected to 89C2051 instead of
PIC but I need to do it without any added wire or sensor to the vechile. It
must be in one box just connected to power.
Thanks for any help to all of you.
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"Dev Cloete" wrote in message
> I developed a Rally odometer which are being used very succesfully here in
> SA. I use a DC Inductive Proximity sensor picking up a steel extrusion on
> undriven wheel hub to eliminate wheel slippage errors or propshaft ( in
> wheeldrive applications). These sensors are used to supply reliable pulses
> under severe conditions. A PIC16C84 microcontroller is used. The firmware
> hardware make provision for calibrating the system for wheelsize:(Wheel
> rotations/Km) The Input pulse is multiplied by 100 in the firmware and
> divided into the wheelsize Factor to display distance in 10 meter steps.
> firmware are also easily adapted to display speed incorperating a software
> clock to produce Kph or Mph. Display is on a
> 4 digit LED seven segment display. Four spdt switches, center off,
> are used for correcting display if vehicle or navigational overshoots
> occur.(+/- 1m, +/-10m, +/-100m, +/-1000m), a up/down count switch,
> left/right switch(dual sensors) and reset switch is also incorporated.
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