Just saw this thread : Showcase: My DIY Racing Laptimer/Datalogger - Product Design - Arduino Forum
Looks pretty nice, I might do the same but leveraging the racebox micro and another Arduino
@Bimodal_Rocket @tjkoyen @KartingIsLife Finally got the motivation back to work on that, since I did my first prototype, which worked but had many issues (vibrations, weak screen).
V1 :
The main thing that motivated me is the screen, I was finally able to source transflective displays. Those combines a backlight with the sunlight to create a bright display. The brighter the sunlight is, the brighter the display is. Bonus, the screen is tactile.
The board is a new design, that integrates a 4G router and a sim port, so we can get data through internet, and it will use a 10Ah pouch battery to last 30h.
That’s so sick. Great work! So it’s a touchscreen? While cool, I can’t help but think physical buttons would work better with gloves on. Sometimes I change my display while racing, which would be tough with a touchscreen.
It is indeed a capacitive multi-point touch display. Works well with gloves. The idea is to work with screen zones instead of buttons on the UI. Top-Left/Top-Right cycle through screens, bottom-left open a menu, bottom-right is free for any fast access to a feature.
This is very cool indeed! I love it.
It will use a magnetic mechanism to lock on the wheel. Worked very well on the V1. V1.0 had 4 10kg neodyme magnets, I scaled it down to 2 10kg but it is still far too strong. This version will have 2 2kg magnets.
Fuggin love to see this. 
I will buy one if it becomes a product!
Needs to be FAR TOO STRONG to keep it in place during shunts…IMO. Nice work, mate!
Indeed, but it was far too strong to the point I was scared to break my fingers lol
Gopro also seems to have moved to magnetic system for its mounting bracket.
Have you considered a “quadlock” style mount?
I did, but I would like to avoid any dependancy to any 3rd party design (despite using quadlock on a daily basis on my bike)
Same for DJI
My DJI Osmo 4 has a magnet but there is still a physical lock that holds the mount in place. I personally would not want to trust a magnet based on seeing how bent things get in a wreck. You can also get pretty stiff penalties if things fall off the kart.
I understand, and it will be empirically tested anyway 