PCeBiker
No-Hands No-Pedaling No-Credentials
- Region
- Canada
Ho Lee Crap 
!!!.
I got into the Vado and came up with this 6 magnet Speed Sensor.
6 magnets stuck to the brake rotor,..
(The rotor alloy has some iron in it, so the magnets stick.)
I used my glue gun to tack the sensor to the underside of the frame at the dropout.
It worked !! But,..
It only worked at slow speed and didn't work at 32 kph.
At slow speed, the speedometer was reading correctly, but at 32 kph it was reading half the speed and kept trying to go faster ??
(Luckily I could use my Voltbike speedometer to verify the speed)
Weird??
So I turned my Maximum speed down to 28, and it worked properly, but it went to a half speed reading starting at 29 kph ??
The sensor light was pulsing showing that it was working, but it was too hard to see the flashes, when it was spun up to 42 kph.
The hard part was getting the magnets evenly spaced, because the rotor has six bolts, but has eight rotor arms (or whatever they're called?)
I had a few more mm of room to move the magnets further outbound on the rotor before they hit the brake caliper mount, so I put a magnet on every second rotor arm to give me 4 evenly spaced magnets.
(I only had 6 magnets, so I couldn't try 8)
It Worked !!!
But, that's only one magnet more than the 3 that I had intended to put on my spokes.
And I'd have to extend my sensor wires again to get the sensor down under to the axle dropout.
So,..
I reconnected the speed sensor to its original position with the single spoke
& ordered a bunch of 4 X 2mm and 5 X 3mm round magnets that I should be able to 
glue to the rotor arms, to get my magnet count up to 8 with plenty of spacing.
My rotor arms are ~4.5mm wide at their narrowest,..
So,..
I can put a single 4X2 magnet on the rotor facing the sensor, and one or maybe two 5X3 magnets on the backside of the rotor to strengthen the magnetic field.
(I've got a Mile of space on the backside of the rotor because of all that Fatbike spacing crap.)
Three stacked magnets should give a stronger, shorter pulse to keep my controller happy and not have it Flip Out and conjoin half the's
(or so my Vado enhanced thinking tells me.
)
I figure that the six magnets were too wide, and too close together, so the controller got confused and started to count in pairs?
.
!!!.I got into the Vado and came up with this 6 magnet Speed Sensor.
6 magnets stuck to the brake rotor,..
(The rotor alloy has some iron in it, so the magnets stick.)
I used my glue gun to tack the sensor to the underside of the frame at the dropout.
It worked !! But,..
It only worked at slow speed and didn't work at 32 kph.
At slow speed, the speedometer was reading correctly, but at 32 kph it was reading half the speed and kept trying to go faster ??
(Luckily I could use my Voltbike speedometer to verify the speed)
Weird??
So I turned my Maximum speed down to 28, and it worked properly, but it went to a half speed reading starting at 29 kph ??
The sensor light was pulsing showing that it was working, but it was too hard to see the flashes, when it was spun up to 42 kph.
The hard part was getting the magnets evenly spaced, because the rotor has six bolts, but has eight rotor arms (or whatever they're called?)
I had a few more mm of room to move the magnets further outbound on the rotor before they hit the brake caliper mount, so I put a magnet on every second rotor arm to give me 4 evenly spaced magnets.
(I only had 6 magnets, so I couldn't try 8)
It Worked !!!
But, that's only one magnet more than the 3 that I had intended to put on my spokes.
And I'd have to extend my sensor wires again to get the sensor down under to the axle dropout.
So,..
I reconnected the speed sensor to its original position with the single spoke
& ordered a bunch of 4 X 2mm and 5 X 3mm round magnets that I should be able to glue to the rotor arms, to get my magnet count up to 8 with plenty of spacing.My rotor arms are ~4.5mm wide at their narrowest,..
So,..
I can put a single 4X2 magnet on the rotor facing the sensor, and one or maybe two 5X3 magnets on the backside of the rotor to strengthen the magnetic field.
(I've got a Mile of space on the backside of the rotor because of all that Fatbike spacing crap.)
Three stacked magnets should give a stronger, shorter pulse to keep my controller happy and not have it Flip Out and conjoin half the
's(or so my Vado enhanced thinking tells me.
)I figure that the six magnets were too wide, and too close together, so the controller got confused and started to count in pairs?
.
