I would like to try BitGym which I believe requires FTMS. When I enable FTMS by uncommenting #define PROVIDE_FTMS in options.h, it freezes on the log screen during startup.

In main routine, if I have the following, Zwift works fine: Bluefruit.setName("K");

However, if I put Bluefruit.setName("KbikeBLE"); in there, the cadence part seems to work fine and lists the service as KbikeBLE, however, the Power Source connection in Zwift show the service as K36. It does connect, but immediately I get a No Signal alert on that service. Speed shows up but Power does not. I didn't pick up the latest release that allow FTMS to be disabled but I believe I have FTMS disabled on my own.
I guess I must have something messed up as I sense that other folks have this working without a problem.

This software is awesome. I am quite new to programming. In order to get this software to work with the RGT Cycling app, I disabled Advertising of the ftms service. Apparently RGT software didn't like that? Before I disabled it, my board would never connect. After disabling, it connects every time. If I decide to pay for Zwift, maybe I will have to re-enable? Not sure.

Thanks

Hello,

I love your work, unfortunately seems a bit complicated for me.

1. Is it possible to create a version for us that only add the bluetooth function to the Keiser M3, while keeping the original display please!!?
2. Does the heart beat sensor work here?

Cheers,
York

Hi - Not sure if you considered this or not. Do you think it's possible to simultaneously connect both the M3 computer and the KBikeBLE? I split the cable to each device. When I do that, everything seems to work except there is no voltage on the resistance pin. I've tried several combinations of pullup and pulldown resisors, with no luck. (very, very newbie here).

Any ideas?

This software and build is really cool! Thank you for sharing it!

I'm a fellow M3 bike user and have been looking for this exact solution for my bike to be able to connect via bluetooth with fitness apps.

I'm new to coding and these kind of DIY projects in general and I thought this was a good real world project to dive into but I'm struggling a little to know which components are necessary and compatible for this project.

I was wondering if you could post a list of the exact Arduino board, display, and other parts for this project that you are using?

Sorry if this isn't the correct forum to ask this, I'm new to Github as well.

I think what you have done is pretty awesome and appreciate you sharing it.

I modelled a calibration tool for those with 3D printers. Dimensions taken from a genuine Keiser tool. Model available here:

thangs.com or printables.com

If setting #define GEAR_DISPLAY false in options.h, on startup the label GEAR rather than RES % is used. Toggles correctly when moving resistance lever to the top.

Hi,

Thanks for this awesome project!

I went ahead and purchased the Adafruit feather and featherwing OLED 128X64 as mentioned in HOWTO.md. There is very little information available regarding using the 128X64 SH1107 OLED with U8G2 and I am struggling.

I have altered the U8G2 constructor from:
U8G2_SH1106_128X64_NONAME_F_HW_I2C display(U8G2_R1, /* reset=*/U8X8_PIN_NONE);
to:
U8G2_SH1107_64X128_F_HW_I2C display(U8G2_R0, U8X8_PIN_NONE);

Without the display plugged in, it works as expected BLE etc. When I plug the display in, as soon as the display shows "KBikeBLE" followed by the version, the feather reboots? in a loop: Boot with USB

I am not really sure where to start debugging. I tested the display using the code on this page and it works fine so no issues with the hardware.

Any help much appreciated.

UPDATE: I was just packing up for the night when I unplugged the USB cable so it was just on battery, now it almost works as expected: Boot on battery

• Interesting that it boot loops when connected to USB
• Also interesting that there are those faint horizontal lines

Just an FYI....
I got KBikeBLE's software to work with a SEEED STUDIO XIAO NRF52840 processor, which is quite a bit smaller and less expensive. A few changes I had to make:
Added “static const uint8_t VBAT = PIN_VBAT ;” to Variant.h file so I could use this in bike_interface.h.
In Bike_interface.h, instead of #define BATTERY_PIN A6, changed to #define BATTERY_PIN VBAT
In Arduino IDE, in board manager, added “Seeed nRF52 by Seeed Studio.

I used 1.0.0 of this board library as I believe newer versions don't support the BLE libraries in this project.

Hello. I just wanted to comment that after mounting this fantastic screen and enjoying such a good Bluetooth connection and watt measurement, I wanted to do something to use a motor map to change gears without using the lever. Searching I found another great project that did just what I wanted and also had ERG and SIM mode for Zwift.
It is a project for other types of bicycles but I have adapted it for the "Keiser M3".
I'm still testing and calibrating but I'm already enjoying it and I think it may be of interest to anyone who already has this screen. I have modified the files and have the STL for the "Keizer M3" that I will share shortly when I finish making all the changes.

I haven't been able to train yet due to illness but this week I will start and check how it works with long training sessions.

My impressions have been very good so far and I am very impressed with the result.

Any help here we can comment.

In this link I comment on the adaptation.

All the best.

Hello Alan,

How can we buy you a coffee to thank you for developing this.

I am very grateful for the work on this project. I have assembled everything and it is going very well. Better than the original screen.
I have designed a quick box to house all the electronics and have mentioned this project.
I don't know if I'm breaking any rules. If so, let me know.
And if a larger screen with more information is added in the future, I would design another box.
Thank you so much.
Link to box:
Box 3D

Thanks for this awesome project. It would be awesome if you could include or link to photos and instructions for the hardware connection on the M3. I don't have an M3 yet so I want to know what's involved with this before I make the purchase.

I got my Keiser M3 working with this code, modified slightly for my display and changes to the I/O. It appears my bike's I/O is different from the pinout identified by KBikeBLE. Below is what I am using for my bike and it is working with RGT Cycling app. Thanks so much for this development.

My Keiser M3 Serial No: 080118 (which means built 2008 - Jan 18)
Keiser M3 interface through the RJ9 4p4c jack:

  Red     - CRANK_PIN - crank switch to ground (dry switch, not Hall effect)
           To a digital input. Transient protection is recommended.
  Yellow  - RESISTANCE_TOP - 10K magnetic brake position sense pot high side
           Use a digital output so it can be turned off to save power
  Green   - RESISTANCE_PIN - magnet brake position sense pot wiper
           To an analog input channel
  Black   - GROUND - magnetic brake position sense pot low / crank switch low side

28Dec2022
Just a note, The Digikey Part Number 1175-2286-ND with description CABLE MOD 4P4C PLUG TO PLUG 7' is the cable I used for this project. It reverses the conductors order from one end to the other. This caused me problems until I figured it out :( The above coloring is referenced at the original cable by the crank.

I am having trouble to connect to zwift on ipad. Can connect to the power via bluetooth but when click on cadence it found nothing.

I have failed a couple Crank Pin inputs on my processors. I do not have any suppression, despite your recommendation. I looked at the signal with a scope and it looks very clean, no voltage spikes. Did you have problems with this input before you added surge suppression? My project has run for hours before actually failing the input previously. Today, it failed after only 5 minutes so trying to find a solution that I can be confident with. Wondering if your suggestion for suppression was based on experience on this project or experience with reed switches in general or just good practice.

Thanks again for the awesome project. I actually have this running on a Seeed XIAO NRF52840 as it is much smaller and cheaper than the Adafruit Feather you used.

I've gone through how to setups and Brought my M3 KBikeBLE up and running. Calibration is completed.

The screen shows all values, RPM, Gear and Watts but when I connect my KBikeBLE to Apple Watch or Zwift, Only power value is transferred. Cadence or Speed/Distance values are not shared. I am not %100 sure I get the power values from KBikeBLE.

I enabled CPC / FTMS and both of them at the same time in different builds but still can't get the cadence and speed/distance data via bluetooth.

related section of the options.h

/* Bluetooth services. --------------------------------------------------------------------------------
   We can provide Cycling Power Service (CPS) and/or FiTness Machine Service (FTMS).
   CPS has been more thoroughly tested. In addition, apps that use FTMS may expect to be able to set
   the resistance (as with a full trainer). FTMS must include speed (Km/hr) and may include distance (Km), 
   but these are just estimates. Keiser's speed estimate, for example (like Peloton's)
   is just a fixed functions of power. It seems better to let training/riding apps like Zwift calculate
   speed from power, rider weight, and incline.

   Considering all of the above, the current default is to provide CPS only.
*/
#define PROVIDE_CPS
//#define PROVIDE_FTMS

#if (!defined(PROVIDE_CPS) & !defined(PROVIDE_FTMS))
#define PROVIDE_CPS
#endif

This is my first time working with microcontrollers and I have no idea where I am making mistakes. I do appreciate any help.