[Autopilot] Re: Autopilot-devel digest, Vol 1 #754 - 1 msg

[Kumar G. <kg...@cs...>]

A lot simpler will be to use a Hall's probe with a tiny magnet installed
on the shaft's edge. The commercial governors also use the same.
If you are going for optical sensor, there will problem of amplifying the
signal, if your counter is edge triggered, it will again create problem as
the edges will not be sharp.
Though for your purpose, you can safely use an 8-bit counter with the
carry bit fed to 8052 which can then communicate with the serial port.
KG


On Mon, 12 Apr 2004 aut...@li... wrote:

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> Today's Topics:
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>    1. RPM measurement and sensors. (Francisco Lobo)
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> --__--__--
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> Message: 1
> To: aut...@li...
> From: Francisco Lobo <Fra...@lo...>
> Date: Mon, 12 Apr 2004 20:53:56 -0500
> Subject: [Autopilot] RPM measurement and sensors.
> Reply-To: aut...@li...
> 
> I need an IR or optical Tx/RX led (With housing), this sensor will be 
> used to measure RPM on a shaft, we are going to mount an aluminum 
> reflective tape strip in one side of the shaft, and we expect to read 
> RPM by detecting the strip pass by the sensor.
> 
> We need a small and reliable sensor that can be mounted about 5 to 8 mm 
> away from the shaft and get a good reliable reading, and also we need 
> the sensor not to drain a lot of power, and we also need it to work 
> with 5vcc :) a lot of requirements, but i guess they are easy...
> 
> Does someone knows of a good sensor we can use for this, we need a fast 
> one that can detect revolutions up to 25,000 rpm's
> 
> 
> Do someone knows one?
> 
> 
> Please help!!! Where can i get it and any ideas for this app?
> 
> 
> 
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