In the case of setup mode where it's just a constant repeating pulse, I set a desired speed in code (15kph typically) and then solve for required wheel RPM, milliseconds per revolution and pulse time, being the duration the electromagnet is firing. That pulse time is simply 1/12 of the...
Update on the reversing pulse:
Good news is that I've completed the code changes to run the L9110 driver. These first included the rewrite of how the multiplier behaves at low speeds. In the past, the first five wheel revolutions from stopped just pulsed the coil in unison with the passing...
Yes the dashed line is the field produced by the coil. In fact it switches much faster than the what's induced by the natural analog motion of the rim magnet - I was actually thinking of slowing it down! You can see it's just about vertical vs the slight slope in the blue Bosch line as the...
Quick update. Using the L9110 driver (thanks @tatane for the tip on this) I'm able to produce a reversing coil signal with exponential growth and decay which very closely matches the original Bosch rim magnet profile. Snip below using some data captured using my phone.
I'll incorporate this...
Eeep I'm on Software version 5.17.0 on the drive unit! App version 1.17.2(1037).
I'll spend some time to integrate the + - pulse behaviour on my test bed. I'll come back with an update.
I don't think I'm brave enough to update the drive unit firmware though!!
Anything's possible of course but I'm still a bit skeptical of this. I just think there's too many variables that are unaccounted for. And sure, Bosch want to demonstrate that they're policing the max speed rule for a given market, but surely not at the expense of false positives being thrown...
No not at the moment. I got the driver in case I encountered trouble but didn't need it. I might give one a go on my bench setup to in case I'm actually a long way behind on the firmware...
Hi Frank,
Let me check the version tomorrow to confirm, I'm not sure off-hand, but it must be an older one as I'm not facing those problems.
I actually picked up some L9110S stepper motor drivers to accommodate a reversing pulse but had the need to get it setup. You might find using something...
Hi guys,
I've been running my updated setup with hall sensor and new coil since early December and it's working well. Changes from the original design in the tutorial are as follows:
Addition of small OLED display with two buttons to show simple ride stats and allow for user configuration of...
Yeah I figured the same. @Karamba! is on the money: I think what we need is a frame that will suit a full-ish power motor but with a smaller battery. Say for example the Kenevo SL to suit the M820.
Has anyone come across a frame similar to the Kenevo SL to suit the light weight motors like the M820/HPR50 etc?
My pedal enduro bike (170mm/170mm) is getting so little attention these days that I'd considered selling it. But if I could transfer the majority of components to a new motored...
Hi Frank,
Good to hear your build went well.
When traveling slow, the pulse is 1:1 as you found. Then over the next five wheel revolutions the pulse duration will gradually increase each time as dictated by the multiplier value. However you should not see anything like 1200ms.
It's really the...