138 lines
5.6 KiB
Markdown
138 lines
5.6 KiB
Markdown
# Concept2 Related Information
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[ORM Beta Repo](https://github.com/JaapvanEkris/openrowingmonitor)
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## [Settings](./docs/rower_settings.md)
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### [Profile for Concept2](https://github.com/laberning/openrowingmonitor/issues/77)
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#### Model C
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The Model C has 3 magnets on the flywheel giving:
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numOfImpulsesPerRevolution: 3,
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minimumTimeBetweenImpulses: 0.010,
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maximumTimeBetweenImpulses: 0.044,
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'autoAdjustDragFactor: true' here as well, which is doable for the Concept2:
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Setting it to true, will allow Open Rowing Monitor to automatically calculate
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the drag factor based on the flywheelInertia and the on the measured values in
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the stroke recovery phase. See: ./rower_settings.md
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[Concept2 Model C Config from beta repo.](https://github.com/JaapvanEkris/openrowingmonitor/blob/main/config/rowerProfiles.js)
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```javascript
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// Concept2 RowErg, Model B and C
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Concept2_Model_C: {
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numOfImpulsesPerRevolution: 3,
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sprocketRadius: 1.4,
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minimumTimeBetweenImpulses: 0.014,
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maximumTimeBetweenImpulses: 0.040,
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smoothing: 1,
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flankLength: 6,
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minumumForceBeforeStroke: 50,
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minumumRecoverySlope: 0.00070,
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minimumStrokeQuality: 0.36,
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autoAdjustRecoverySlope: true,
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autoAdjustRecoverySlopeMargin: 0.01,
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minimumDriveTime: 0.400, // minimum time of the drive phase
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minimumRecoveryTime: 0.900, // minimum time of the recovery phase
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dragFactor: 110,
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autoAdjustDragFactor: true,
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dragFactorSmoothing: 3,
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minimumDragQuality: 0.95,
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flywheelInertia: 0.10148,
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maximumStrokeTimeBeforePause: 6.0,
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magicConstant: 2.8
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}
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```
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## Hardware
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### Model C Hardware
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For the Rpi to register the logical high for the pin (it has a practical logical
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high voltage of above 1.6-1.8v but according to the specs 2.5v is where 100%
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that high is registered).
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A Concept2 Model C output peaks at ~20mV when rowing at moderate intensity, even
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if it peaked at 50mV when rowed by an Olympian that is still far too low for the
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desired 2.5V to consistently read high on a RPi GPIO.
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The module C uses a reluctance sensor
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* [Monitor Pickup and Screw Kit—Model A, C Part Number: 1748](https://shop-uk.concept2.com/parts/121-monitor-pickup-and-screw-kitmodel-a-c.html?search_query=1748&results=1)
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A wire coil with a ferrite core 105ohms) if you replace the magnets ensure that
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the ‘south’ is facing the sensor.
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Here's the C pulse train:
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[2023-11-28_05-35-19_rowingData.csv](https://github.com/laberning/openrowingmonitor/files/13484079/2023-11-28_05-35-19_rowingData.csv)
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#### [MAX9924 Variable Reluctance Sensor Interface](https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9924-MAX9927.pdf)
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£4 per piece on aliexpress
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These are signal conditioning IC's that connect to the Reluctance sensor and
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provide a pwm signal to the microcontroller
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The MAX9924 uses a zero crossing with dynamic threshold to avoid the zero-
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crossings in the noise, but still work with a range of signal strength.
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* [MAX9924 ORM PiHat](https://oshwlab.com/jpbpcb/rower2)
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* [Extra discussion](https://github.com/laberning/openrowingmonitor/discussions/157)
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See: /space/code_repositories/hardware/kicad/open_rowing_monitor
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* The Extra linked page also has a config.js for a Model C using the max9924.
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The layout does not use a ground plane.
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* [MAX9924UEVKIT](https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9924UEVKIT.pdf) See: /space/code_repositories/hardware/kicad/MAX9924UEVKIT
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#### [MAX9926 Variable Reluctance Sensor Interface](https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9924-MAX9927.pdf)
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$0.81 per piece on aliexpress
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This are the two sensor capable IC's which allows them to be used for quadrature
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direction sensing of one sensor or reading from two sensors.
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* [MAX9926UEVKIT](https://www.analog.com/media/en/technical-documentation/data-sheets/MAX9926UEVKIT.pdf) See: /space/code_repositories/hardware/kicad/MAX9926UEVKIT/
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* [rusefi max9926](https://rusefi.com/forum/viewtopic.php?t=994)
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### Model D
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The Model D has 6 magnets on the flywheel with a coil/generator setup giving:
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numOfImpulsesPerRevolution: 6,
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minimumTimeBetweenImpulses: 0.005,
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maximumTimeBetweenImpulses: 0.022,
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The Model D has some uptake issues in its generator: the first x pulses are
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very weak, but when the flywheel gains momentum, it will peak at 15V.
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### [Arduino Monitor for Concept2 Model B C D](https://www.instructables.com/ARDUINO-MONITOR-FOR-CONCEPT2-MODEL-B-C-D/)
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This project uses an arduino mega 2560 with has 5V tolerant pins but uses
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analog read.
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#### Model B and C
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Just add 100k resistor inline with the cable that comes from flyweel (2.5mm TRS
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jack) to the analog read pin (1) on the arduino.
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#### Drag factor
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For a new Concept2, the Drag Factor ranges between 80 (Damper setting 1) and
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220 (Damper setting 10):
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* [concept 2 model c damper level 01 oscilloscope data.txt](https://github.com/laberning/openrowingmonitor/files/9336167/concept.2.model.c.damper.level.01.oscilloscope.data.txt)
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* concept 2 model c damper level 10 [oscilloscope data.txt](https://github.com/laberning/openrowingmonitor/files/9336169/concept.2.model.c.damper.level.10.oscilloscope.data.txt)
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Model A,C,D,and E has 14 tooth gear
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[Model B drag factor is different](https://web.archive.org/web/20230601051848/https://board.crossfit.com/showthread.php?t=20648)
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requiring a little recalculating.
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The resistance is determined by cubing the number of teeth on the sprockets.
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13 x 13 x 13 = 2197 (Model B, small wheel)
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14 x 14 x 14 = 2744 (Models C/D/E)
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15 x 15 x 15 = 3375 (Model B, big wheel)
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