robot.hebobo
Dirt Disciple
I recently picked up an Avocet 30 at a garage sale - always wanted one of these classic cyclocomputers, and it's perfect for my PDG70 project.
Problem is, it seems that there is something wrong with the magnet ring (or, at least, that's my best guess).
These computers don't use the simple magnet and reed switch that most other cyclocomputers do, but instead an (overly complicated?) system with a rubber ring magnet which has some kind of pattern of north-south regions which induces a current in the sensor as the wheel spins.
Problem is, the one that came with this computer seemed to have gotten demagnetized (and then I made it worse...).
Basically, it would read extremely low, like, if I spun the wheel as fast as possible, it would read 3-4mph, and never higher. I think basically the sensor was only being triggered intermittently. I then tried to figure out the pattern by dragging another magnet across the ring... and inadvertently completely demagnetized it!
Now it doesn't register at all.
Does anyone know details of how these worked? Sheldon's site says it's a 20 pole magnet...
Wondering if I can remagnetize, or 3D print a new one with 10 small magnets embedded.
It's currently in a 3D printed carrier as the original ring had 3 mounting points and my wheel is 32 spoke, so I created a 4 point carrier and moved the magnet over... so creating a brand new carrier seems possible...
Problem is, it seems that there is something wrong with the magnet ring (or, at least, that's my best guess).
These computers don't use the simple magnet and reed switch that most other cyclocomputers do, but instead an (overly complicated?) system with a rubber ring magnet which has some kind of pattern of north-south regions which induces a current in the sensor as the wheel spins.
Problem is, the one that came with this computer seemed to have gotten demagnetized (and then I made it worse...).
Basically, it would read extremely low, like, if I spun the wheel as fast as possible, it would read 3-4mph, and never higher. I think basically the sensor was only being triggered intermittently. I then tried to figure out the pattern by dragging another magnet across the ring... and inadvertently completely demagnetized it!
Now it doesn't register at all.
Does anyone know details of how these worked? Sheldon's site says it's a 20 pole magnet...
Wondering if I can remagnetize, or 3D print a new one with 10 small magnets embedded.
It's currently in a 3D printed carrier as the original ring had 3 mounting points and my wheel is 32 spoke, so I created a 4 point carrier and moved the magnet over... so creating a brand new carrier seems possible...
