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"Honey, I shrunk the DAQ!" First testride with the new Trazer V2.2 and the new Sensors. About 50 % smaller Trippled Battery capacity Standalone USB-C charging port Beeper for UX support Two Buttons with LED Front Sensor is now a "standard" linear potentiometer with a carbon tube "casing" Re-designed rear sensor that now has a bearing instead of plastic on plastic with small air gaps. Works great! Edit: Another overlay video for those interested. Also with a pretty stiff fork setup regarding dynamic sag (21%) ;-) https://youtu.be/1LCTslCTWLQ?is=856_7CwAul5PZ51R

Credit goes to sghctoma who originally did the rotational sensors. I have ordered some linear sensors, but I don't think I can fit anything in the SC tunnel... I got tired of the cave look, so now with light mode! Also - lots of quality of live improvements for the sessions. The telemetry plots can be reordered, minimized and embedded in one another. They are also scrollable and resizable with dividers Holding down Option/Alt while zooming in/out of the plots makes it much slower and precise. Holding Shift while scrolling in the plot area will skip zooming the plot under...

These are old photos but hopefully you can figure out whats going on inside them! They are all constructed in a similar way

Another DIY datalogger update. I have three main things to report, and an invitation. - The project has a build website: www.bodaqs.net has sourcing and build guides for the hardware, a user guide for the logger, and a software guide, as well as an overview of the project. - syn.bike compatibility. The logger can output files for direct upload to data.syn.bike, which is a simple, clean option that will satisfy most users. I'm still working on my own software, but that is going to take time and I don't want to reinvent the wheel (more than I have already). -...

I opened up my BYB fork sensor to clean it up - was a little easier than the AIM ones were - its a snug fit but not as tight since the screws hold it in place, so can be carefully pryed apart with a metal spudger or blade. The wipers looked pretty good, a tiny bit of dirt in there so I'll clean it out, replace the o-rings and add a tiny amount of thin super lube grease to the contact points to reduce friction and give smoother contact for the wipers. It had quite a lot of play...

My setup is linkage driven with bearings and cheap rotational sensors ($3 each) The kinematics setup in the app then translates the angle of rotation of the sensor into shock/wheel travel. The firmware/app also support linear sensors. I have compiled extensive documentation on both the firmware architecture, hardware build and daq operation. There is another architecture document for the app which explains the telemetry and kinematics calculations.

I love the DIWhy vibes from the last few pages 😍 I have been working a lot on the App and the Firmware for the mast month or so. I have made a lot of progress into packaging it into end to end usable, both on desktop and mobile. Major changes Live data! Now you can stream the sensor readings from a connected DAQ in more or less real time (20-30ms delay). You can set the time on the DAQ and you can edit and replace the configuration, without dealing with memory cards and text files! You can also change...

I had no idea who he was, but looked up some of his videos after seeing his name mentioned on PB. Pretty sick rider. I've never BMX'd before but I always appreciate a good vid

So I sacrificed a string pot on the altar of science. TL;DR: So far, the results are encouraging. I used a lathe to drive the pot via an offset crankpin, allowing me to calculate the theoretical string trajectory exactly, and the maximum velocities and accelerations at different lathe speeds. The downside of this arrangement is secondary vibration: because the string oscillates vertically, its inertia introduces an error that gets larger as the speed of rotation grows. The good news is that, because it isn’t something the pot will experience in real use and occurs at mid-stroke, I think it can...

Here is my modified version of the KPM-12J Potentiometer. I covered the pot with two sliding carbon tubes together with two 3D printed endcaps. It adds 35g to the pot but provides a whole lot of stiffness and protection against dirt and grime 😁 I also made another short video trying to explain a bit about TRAZER for those who are interested :-)

I probably haven’t been up Cypress in 15 years and of all the days to randomly go up there to teach my son to drive stick in the parking lot…. lol

link to their site for hardline BC and PR below - https://www.redbull.com/ca-en/events/red-bull-hardline-british-columbia FOR IMMEDIATE RELEASE RED BULL HARDLINE SET TO MAKE CANADIAN DEBUT ON OCTOBER 17, 2026 Cypress Mountain, British Columbia to Host the World’s Toughest Downhill Mountain Bike Race April 9th, 2026 – Vancouver, Canada: For the first time ever, known as the world’s toughest downhill mountain bike race, Red Bull Hardline, will debut in Canada at Cypress Mountain, British Columbia. This invitation only competition will see the world’s top male and female riders come to Vancouver’s North Shore, often hailed as the birthplace of freeride mountain biking. This...

Sounds like what's needed is a roll-your-own string pot that can be built for about $10... coming soon to an open-source data acquisition project near you. Maybe. This guy runs on the bench and can either emulate an analog pot or be read over I2C. It's built around an as5600 encoder: that plus a couple of bearings, a spring from a key lanyard, a 3d printed spool and a short piece of chrome shaft pulled out of an old scanner make up the driveline. It's multi-turn which keeps it compact (and the inertia low), but at the cost of having...

The string pot works well, the only negative on ours is the mounting. The awkward shape almost always requires us to print a new mounting bracket for each bike to get proper alignment, whereas the linear pots typically can reuse mounting hardware. We just use the Aim pot but there's other options out there that might solve this issue. FYI, KTM has used the string pot on the front for years.

Yes, absolutely. The idea is that this is an open-source project. I don't have build guides etc written up for it but I am looking for people to try it out - once I've tested the new PCBs and made sure they work OK, I'm happy to send you one for the cost of postage along with a shopping list for the other minor bits required. Same goes for anyone on here as long as (1) you send me some feedback, and (2) you understand that it's still basically a DIY project - I'll provide whatever help and support I...

Follow up to this one. I serviced the fork (lower leg service) which was basically new in the last video. There was some oil in it but definitely not the amount mentioned in the manual. I also maxed out the VIVID Air with 4 tokens since the data showed (for my newbie eyes) that the shock is working way more and blows through the travel in G-Outs and impacts after small drops. Both things made a very big difference! The fork is now way more active than before and also feels even better than it did before. I also feel...

Do you need much more than on and off? And a light to indicate data acquisition.

First test build of the new logger. Same functionality as the last one (4 analog + I2C), but smaller and more tightly packaged. I'm on a mission to get the parts count (and cost) as low as I can without giving up any important functionality. The screen is a head scratcher. I find it a nice quality-of-life feature and it doesn't add much to the cost, but people seem to be able to live without having one. Feedback from users of other systems appreciated!