Use FortiusANT with "Raspberry Pi Zero"

[WouterJD]

Hi, not sure if I should post this here or in #3

Well I sort of figured out and fixed the replugging thing so I no longer have to replug it every time, I think the program is not shutting down properly. I fixed it by initiating a reset when it times out, and I've progressed passed that to get this working on a Raspberry Pi Zero, thanks to the above closed thread.

What I am trying to do now is get your code to acknowledge a regular speed+cadence sensor.
Speed/cadence only displays on data page 0, but since I am new to Ant+ I am unsure how to read this and either bypass the trainer check and put it in the simulated trainer, or add it as a trainer type. I made this crudely to see if I can get it displaying (also added the other bits like ChannelConfig etc.)

def msgPage0_CombinedSpeedCadence(Channel, Spec1, Spec2, Spec3, Spec4, BikeSpeedEventTime):

    DataPageNumber = 0
    Spec1 = int(min(0xff, Spec1))
    Spec2 = int(min(0xff, Spec2))
    Spec3 = int(min(0xff, Spec3))
    BikeSpeedEventTime = int(
        min(0xffff, BikeSpeedEventTime * 1000 / 1024))  # Convert seconds into 1024seconds (since ever)
    fChannel = sc.unsigned_char  # First byte of the ANT+ message content
    fDataPageNumber = sc.unsigned_char  # First byte of the ANT+ datapage (payload)
    fSpec1 = sc.unsigned_char
    fSpec2 = sc.unsigned_char
    fSpec3 = sc.unsigned_char
    fBikeSpeedEventTime = sc.unsigned_short

    format = sc.no_alignment + fChannel + fDataPageNumber + fSpec1 + fSpec2 + fSpec3 + fBikeSpeedEventTime
    info = struct.pack(format, Channel, DataPageNumber, Spec1, Spec2, Spec3, BikeSpeedEventTime)

    return info

What would I need to do to actually open the channel and read from the new sensor? I was thinking of adding an option in GetTrainer(). However, I'm a bit confused as to what to use for idVendor and idpl if the sensor is just a generic speed/cadence sensor (I have the sensor ID that Simulant+ picks up, would I use that?)

Originally posted by @Alanimus in #8 (comment)

[WouterJD]

I try to understand what you want to achieve, but cannot figure it out.
To understand, please explain what a "Raspberry Pi Zero" is.

I created wiki page Fortius ANT Configurations and perhaps that gives a hint to draw what configuration you want to achieve.

The 4th configuration (with the independant HRM strap) is an option I'm building these days.
The -H flag makes FortiusANT to listen to an ANT+ master device (a heart rate monitor strap) to pick up the heartrate when the Tacx Fortius does not supply it, in the case you would use a new ANT+ HRM that is not recognized by the Tacx Fortius. This is not essential, but makes the heartbeat display work again.

In case somebody would use a bicycle with a power-meter and cadence sensor, need would arise for a -P and -C flag, so that FortiusANT would pick it up (listen to ANT+ master devices) and send it as one integrated ANT+ FE-C master device to the training software (Trainer Road, Zwift).
This would only be usefull, if you have a trainer brake without power/cadence sensor, integrate them with the independant devices as one ANT+ FE-C device.

As stated above, an explanation what you want to achieve would be helpfull; To answer your question, I think that adding options to GetTrainer() would NOT be usefull, since that is the USB-interface to Tacx Fortius

[Alanimus]

Yes I see now, sorry I was probably asking too many questions at once. I was really asking how to actually read from the separate speed + cadence sensors but I managed to figure it out. The code I posted was backwards, I was mixed up between the "page" and "unpage" functions. I'm using this code as a base because it already has all the calculations to convert speed and cadence to simulated power and reads track resistance from Zwift.

…

On Sun, Feb 9, 2020 at 8:49 AM WouterJD ***@***.***> wrote: I try to understand what you want to achieve, but cannot figure it out. To understand, please explain what a "Raspberry Pi Zero" is. I create wiki page Fortius ANT Configurations <https://github.com/WouterJD/FortiusANT/wiki/FortiusANT-Configurations---ANT--Master-and-Slave-devices> and perhaps that gives a hint to draw what configuration you want to achieve. The 4th configuration (with the independant HRM strap) is an option I'm building these days. The -H flag makes FortiusANT to listen to an ANT+ master device (a heart rate monitor strap) to pick up the heartrate when the Tacx Fortius does not supply it, in the case you would use a new ANT+ HRM that is not recognized by the Tacx Fortius. This is not essential, but makes the heartbeat display work again. In case somebody would use a bicicle with a power-meter and cadence sensor, need would arise for a -P and -C flag, so that FortiusANT would pick it up (listen to ANT+ master devices) and send it as one integrated ANT+ FE-C master device to the training software (Trainer Road, Zwift). This would only be usefull, if you have a trainer brake without power/cadence/speed sensor, integrate them with the independant devices as one ANT+ FE-C device. An explanation what you want to achieve would be helpfull; *Adding options to GetTrainer() would NOT be usefull, since that is the USB-interface to Tacx Fortius* — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#9?email_source=notifications&email_token=AAOSTRONGZK7NEKHNMMOMKLRCAX27A5CNFSM4KSCZKH2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOELGRVIQ#issuecomment-583867042>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOSTRLG44UL5MPKS7FJT7LRCAX27ANCNFSM4KSCZKHQ> .

[WouterJD]

What device do you connect?

[WouterJD]

Also, are you on Strava? Would like to see FortiusANT results :-)

[mtbiker22]

Raspberry Pi Zero (5 euro) is a open source single board computer running Linux with a very small form factor.

[WouterJD]

Raspberry Pi Zero (5 euro) is a open source single board computer running Linux with a very small form factor.
Sure, but I'm curious how this relates to FortiusANT and/or Controllable Fitness Equipment :-)

[mtbiker22]

It can be a cheap platform for ‘converting’ the USB to ANT+ connection. It could run headless and be ‘integrated’

[Alanimus]

Yes exactly. I am just messing around with making a servo work with a non-connected dumb trainer to integrate with Zwift. I am using a generic speed + cadence sensor (but using SimulANT+ for testing). Before I began this I did not realise so many options existed for turning USB trainers into smart trainers, but it is still fun to work on this. I just had/have a big learning curve with how Ant+ signals work and the calculations. I see someone has done something similar with an Arduino and a linear actuator <https://www.instructables.com/id/Open-Bicycle-Grade-Simulator-OpenGradeSIM/> but not on a Pi, though there is a project for integrating HR with fans and lights <https://github.com/jludwig75/trainer_tools>.

…

On Sun, Feb 9, 2020 at 9:35 AM mtbiker22 ***@***.***> wrote: It can be a cheap platform for ‘converting’ the USB to ANT+ connection. It could run headless and be ‘integrated’ — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#9?email_source=notifications&email_token=AAOSTRM5RDJVFIM6KKAX6E3RCA5FDA5CNFSM4KSCZKH2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOELGSZ7Y#issuecomment-583871743>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAOSTRPVGY5K4WZWJMAEMOTRCA5FDANCNFSM4KSCZKHQ> .

[WouterJD]

I guessed something like this was going on.

New to ANT+? I hope you are familiar with www.thisisant.com and
D00001163_-_ANT+Device_Profile-_Bicycle_Speed_and_Cadence_2.1.pdf?
It took me a while to get from the antifier source to that documentation, so ask the dumb question.

If you want to use FortiusANT and read data from cadense/speed sensor:

• in antDongle.py add channel_CSC as a unique channel ID
• in FortiusAnt.py Tacx2Dongle()
  -- open a slave channel to the sensor
  -- expect messages from the sensor (add elif Channel == ant.channel_CSC:) where all incoming messages are handled
  -- handle message 0 (default page) with a msgUnpage0_CombinedSpeedCadence(info) function according the information at page 44 returning BikeCadenceEventTime, CumulativeCadenceRevolutionCount, BikeSpeedEventTime, CumulativeSpeedRevolutionCount

I have created an ExplorANT program to check what dongles are in my computer, what devices are on the network and what happens on the devices. I will publish shortly, after doing some final tests.
I expect this to be helpful for you since it provides a template to create slave devices, listening to master devices; where the BikeCadenceSensor is the one to be implemented by you.

Like to hear from you and your achievements.

[WouterJD]

Alana, new version upload with SCS code example added. Check antDongle.py and FortiusANT.py for "scs". Tested with https://www.strava.com/activities/3088842976

[WouterJD]

If more info needed, please reopen the issue or create a new one.

[WouterJD]

@Alanimus you will like to see the RPI developments!