Technical > Wiring & Sensors

Speed Sensor Genboard Hardware modification

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Sprocket:

--- Quote from: MWfire on October 22, 2009, 07:35:49 pm ---for hall use
http://195.159.109.134/vemsuk/forum/index.php/topic,717.msg7413.html#msg7413

--- End quote ---

Just a quick question about that schematic. The capacitor, is there one or two capacitors? the schematic lables show two capacitors but the diagram only shows one ???

MWfire:
One capacitor. 1nF or 4.7nF or 10nF. So far i thnink 4.7nF is the best.

Sprocket:

--- Quote from: MWfire on October 27, 2009, 02:55:03 am ---You can use that solution for test
http://195.159.109.134/vemsuk/forum/index.php/topic,717.msg7413.html#msg7413 without R4(dont connect to pin1(+5V).
Inevitable put 4.7V or so zener diode.

BTW that is pinout for vems connector near procesor, not ps/2 connector.

--- End quote ---

Just worked out that the speed sensor for the bike clocks im using is infact 12v pull up on the clocks themselves.

Do I need to follow the above, and leave the 5v pull up on the board off?

Do I need the 4.7v zener instead of the 5.1v?

thanks again

MWfire:
you can remove pullup from board(5V), a you can put 4.7V zener diode

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