AVR-Chat

>> Measure the travel of *this* wheel: http://home.
<http://home.hiwaay.net/~dkelly/Husaberg/Pages/4.html>
hiwaay.net/~dkelly/Husaberg/Pages/4.html

>No problem - add a reluctance pickup, near the chain, on the front of the
drive sprocket. 

I think meant how far the wheel moves up and down in relation to the frame.
Is this for the rear wheel?

LVDT? or Something simpler -> Concept: mount a 10 turn linear pot with a
negator spring and small deep section pulley directly attached to the pot
spindle. Wrap 10x with fishing line all sealed in a rubber casing that has a
tiny hole for the fishing line to escape as the actuator. Depending on your
pulley circumference (x10), depends on linear distance measurable. Wind the
pot fully anticlockwise, connect spring, then wrap the line around the
pulley clockwise. The negator spring is a constant force spring and as you
pull the fishing line it tightens up and applies constant force on the line,
and the distance moved is then a linear resistance measurement. Mount the
module above the rear plastic guard, (secondary protection against direct
mud/stone spray, and gravity works to your favour to some degree) but keep
close to the frame then drill tiny hole/slot through guard, seal with second
piece of rubber, pull fishing line though and attach to the swingarm via
swivel, but closer to the pivot point to keep away from potential sticks
etc. Any mud that collects on the string will be wiped of by the rubber
seals (similar to the front shock seals). This method may be prone to
sticks/stones/sticky mud/ though, but is ultra cheap and easy to do. I'd be
interested if you actually do this.


>As for measuring the liquid level, assuming the system is still, aim a
columnated beam of 
light at the liquid surface at an angle from the side and sense the
reflected spot on the 
other side.

>Bruce
 
Re the measuring the levels, have you considered what canon do on their ink
cartridges to measure tank capacity? 
 


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