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I haven't encountered the machine in person, but given the strong similarities with a Concept2, it will probably work, In essence ORM will work on any machine, but the amount of DIY varies to make it work. I like to be as little invasive as possible, so I like to re-use existing sensors, but several others also added their own sensors. When you want to keep the existing sensor in tact: the main question is if they copied Concept2's latest approach where the flywheel also powers the monitor (and thus the wire caries 15 Volt AC) or if it is just a small pulse like the older C2's. I use ORM on a new RowErg and it works well. What kind of connector is on the end of the pick-up wire, and can you attach a volt-meter or something to it? Once the signals are picked up, it is pretty easy to configure the software. There are a few parameters, but out of the box it should already produce metrics. People typically feel if pace presented is realistic, and change parameters based on that. We are here to help you if you run into any issues. |
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This is just a rebranded version of the "Generic Air Rower". Mine called Zocco Body Fit (https://zocobodyfit.ro/produs/aparat-de-vaslit-zoco-body-fit-air-rower-pliabil-ecran-lcd-eficient-si-util-negru/#). In New Zealand they call it XEBEX V2 Air Rower (https://www.megafit.hu/xebex-ar-2-air-rower-legellenallasu-evezogep-cross-trening-edzeshez-v2-consoleH). We had a discussion on it: #28). on aliexpress they call it indoor rower :) here is the link Some "manufacturers" change small things like the performance monitor and they use different sensor. but the Machine is the same. Even the flywheel should have very similar inertia. They are good machines but to have them a very similar experience like on C2 there are 3 things (in addition to the clunky things on them they call "monitors") that needs changing (in the order of importance): 1) handle, original C2 is compatible, 2) shock cord (again original C2 is compatible), seat rollers (but this is debatable on mine it was rubbery that was irritatingly unsmooth compared to C2). The one you posted has the same handle I had on mine before change. You rollers seems to be a better one and seeming the foot strap is better. 500$ is a good price actually for these. One thing you need to check whether the reed sensors are checking the rotation of the handle sprocket with two reads or the flywheel rotation (I am 90% its the handle). The good new is that even if its the handle there is a high chance that you can just move one of the reeds facing downwards to face the flywheel and ad a magnet there:
The cheap AliExpress copies (and mine) use the same injection mold for all kind of version so they have the sitting for reeds on the flywheel where their provided reeds fit exactly only they have chosen to measure the nothingness on the handle... :D::D (on the picture I added a hall sensor that is why there you can see 3 pair of wires). The black and white is the reed. they fit into the whole on the front. |
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@YAMLcase your best shot is bluetooth implementaton as we discussed, i just need the bluetooth name of the device :) |
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As Jaap said, do not try to fit a pm5 here. It will not work. The inertia is not the same as pm5 (inertia on mine is around 0.07848 while C2 is around 0.1).
Are you sure one of the 3 measures the resistance on the air resistance leaver? Its possible that the 2nd and 3rd wire is for the handle rotation detection, so they can detect whether machine is drive or recovery. This helps with their thing to calculate metrics better. Though looking at the picture, there does not seem to be sensor on the handle sprocket so it is not likely. Any way, converting this machine to ORM is as simple as it gets:
Generic Air Rower profile is calibrated for one magnet exactly so it should work out of the box. |
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Just to wrap up some of the findings in this thread: that mystery device in the arm is most likely the HRM sensor. I spent a bit of time researching, crowdsourcing on reddit and asking grok with no conclusive answer but HRM sensor is most likely. definitely not an off-the-shelf part . I don't have a Polar or Garmin to test it out so... for me this quells my curiosity. the reed sensor pickup on the R50 won't work with the PM5: different kind of sensor is needed. I got the Model C pickup, tore it apart and found that it was a coil. it appears the PM5 measures the magnetic field, not resistance. The flywheel won't work with the Model C pickup. I got no measurements when I just swapped the pickups. looking more into it I found that the concept2 flywheel has a completely different configuration for the magnets. there are 3 magnets evenly spaced and this just seemed too much trouble to try and figure out how to get working. I ran across a reddit thread where someone had successfully made a retrofit by purchasing a Model D/E pickup, axel, flywheel... well of course why not just get the Concept 2 at that point. |
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Bringing this conversation up as I am a new r50 owner and am very interested in getting ORM working, particularly the ANT+ -> Garmin component. Exciting! This comment inspired hope:
"out of the box" specifically was really exciting. I've got a pi3 laying around, I think. And an ANT dongle. Update: Read the docs! Ordered more Dupont Cables than I will ever need in this lifetime! Also @Abasz :
I haven't popped the thing open myself, but all evidence points to "yes" — the manual has a section dedicated to calibrating the resistance lever arm, and some light teardowns on youtube show the cable running to the lever. Is… is that a helpful sensor to have for ORM? or just like "hey, at least they tried!" also, btw @JaapvanEkris IRT:
I think these guys are blatantly cheating (putting a towel over the fan). In my and I think most reviewers' experience, this thing undercuts you a fair amount. Some sources: |
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@Skodavrs007 did you hardwire a USB battery into the 5V inputs on the board? Looks neat! I have been thinking about how I might be able to keep my machine free from wall outlets |
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@Skodavrs007 your setup looks awesome. i recently got an R50 myself and im about to set it up with ORM. Also i hope you didnt have to make any other hardware updates on the rower itself as i do not feel very comfortable with that part :) thanks guys for this awesome project @JaapvanEkris and friends! |
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Has anyone had success replacing the useless monitor on a Merach R50? I'm looking to build an ORM for this but wanted to check with others first on their experiences.
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