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Anyway everthing fit like a charm, so already quite happy with that, still room to improve, at least from width side i need to go down 10 mm at least. Thinking about different batteries.
I had several weeks of slowing down on the project since i was able to ride more and program less. I was able anyway to get some improvement on the hardware side (i changed the switch on the handlebar casue the old one at first crash it broke and also a shorter GPS antenna)
Also i was pushing a little on the data anlaysis program, implementing self recognizing closed lap, gps maps and some other stuff. Next step will be sure a smaller case and more vibration insulated electric part. On mtb no problem at all, but on motocross bike it just shut down due to high vibration.
On this picture one lap of three subsequent laps here aorund my place in the woods. This feature is really nice to chec different setting and onverlay data
with the analog sensors i am able to reach 500 Hz, but for my level of riding i was not able to catch big differences in the data logged, neither further indication on the analysis,so i'm still happy with 100 since is also more easy to handle as dimension file and synchro with GPS
Only one big doubt remains, i.e. if change the cable entry with a connector like byb logger or aim, or keep the cables out like it is now.
The spring characteristic curves are not linear for air springs, but the Shockwiz setup procedure only defines the two end points, so it can not know where exactly in the travel the spring is. It can only know if it's fully extended or nearly so or if it's fully compressed or nearly so or somewhere roughly in-between.
Because of that limitation I'm guessing Shockwiz does not look at absolute positions, but looks at events. So do you reach full travel, roughly where in the travel you sit most of the time (as it does give suggestions for sag adjustment) sag wise and how far from that you move on certain events, are there oscilations on rebound strokes around the sag (under damped) or a slow return to the sag position (overdamped), are there a lot of deep dive events (not enough high speed compression), are there events with a lot of slowly moving travel and staying there (too much low speed compression), etc. etc.
With LVDTs or some other travel sensor you have a much more detailed set of data,b ut you also need to know what you're looking at on another level.
Regarding the case, if it's going to be 3D printed, make the tabs under the cable ties (the part fixing it to the frame) thicker, if there's any weight inside the case. Thin section could fall off.
And maybe add another central mounting option that is wider and useable for gear straps (liek OneUp's EDC Gear Strap)?
I found out this board
https://www.gilisymo.com/sensors/22-ls53l1bt.html
that has the same sensor i used but also accelerometers and bluetooth. I already contacted the guy and he will send me more information about the limitation of the board etc in the next few days.
My idea is :
- two of this board for acquiring suspension travel (for sure with lower frequency than now ) with their own button batteries
- small acquisition board with the arduino as it is now but with smaller lithium battery since no sensor power supply is needed.
the objective is to have much smaller and clean setup than now, even if accuracy will be for sure less.
There's a reason why measuring equipment is very rarely (if at all, can't remember anything that is wireless at this moment) not wired...
I would assume that 100Hz should be the minimum although I would probably go up to 200 or 400Hz on linear potientiometers at least.
Frequency limit is quite low, it's true but i can anyway run with potentiometer at 200 hz as it is now. I would like anyway to have position record (not for damping tuning) but more for kinematics and sag analysis of the bike during the run. I am building a kinematic program that will compute bicycle position and dimension like antisquat etc based on suspension travel, and with that the 60 hz system should be enough
When i want to optimize damping i will run with analog stuff, both system will be compatible.
But shouldn't the analog potentiometers be enough as one source of information? Or are they not calibrated for travel?
As you can see with both potentiometer remains quite messy
Do you have a link to the potentiometers? I am thinking about doing something similar with potientiometers only over the winter.
http://www.htc-sensor.com/products/212.html
cost around 60-80 € depends on the stroke length.
I think for some prototyping they should work out nicely :D
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