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Bike Sensor



Bike Sensor
by Jarv


Product Review

There exists of a number of scenarios why you’d want to train at higher or lower cadence dependent on your training goals and race scenarios.  Since there’s no display on the sensor itself, you do have to use the phone app to get the data from the sensor. Currently, it has released a free App (simply called Jarv Bluetooth Odometer) which gets the data from the Jarv Bluetooth.







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          Cadence is a measurement of how many revolutions per minute (RPM) your pedal makes.  Configuring the sensor within apps. Cadence is normally measured on the left crank, right where the magnet is attached at the point the pedal connects to the crank.  Most folks tend to have a natural cadence between about 80 and 90RPM.  The cadence measurement is the more useful metric.




          As an example, to setup Strava for the sensor you have go into the ‘Biometric Sensors’ and then enable Bluetooth sensors.  The Heart Rate and Speed & Cadence sensors are available to pair. The unit keeps track of history by week, and will show you weekly summaries. Both of these are available via Bluetooth Low Energy (there are plenty regular non-low energy Bluetooth HR straps as well).







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Product Description  

A few months ago, the functionality of this device was a bit sceptical that it wouldn’t be anything more than just a gimmick.  You may not bother to run the app on the phone (or any cycling devices) for a quick cycling around town the bike. What you found is that it’s actually turned out to be a kind of need in the future.  It is very interesting that you can reset the odometer as well as go ahead and specify a given starting distance. Since the sensor still tracks it, it just keeps on recording what you’re doing anyway with no additional effort (or battery life) required on your part.  In the end, a nice little feature created.




Jarv Bluetooth 4.0 Cycling Speed and Cadence Bike Sensor connects wirelessly via Bluetooth Smart technology to your iPhone without the need for any adapter and delivers accurate real-time cadence and speed data. The Bluetooth Smart Bike Sensor works with most iOS fitness and sports Apps. The bike sensor working together with 3rd party iOS App turns your iPhone into a professional cycling computer device. It is designed for the iPhone 4S, 5/5C/5S, iPod touch 5, and other iOS Bluetooth devices.







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For those of us not as familiar with the other device system, just add a zero to the end and call the period a comma. For some users, this might be kind of confusing since many are used to using centimeters instead of meters (i.e. 3090cm wheel size instead of 3.09m). It is the same length, but different in SI unit. Further more, it also allows you to specify the wheel circumference in meters. 



Specification

Cadence Sensor                       Pedal magnet*1.
Speed Sensor                         Wheel magnet *1.
Sensor Size                            19mm x 57mm x 37mm.
Sensor Weight                                                 23g.
Wireless Transmission
Interface                                 Bluetooth 4.0® Low Energy.
Button & LED                         Main button and LED *1.
Radio Transmission
Range                                                    10 meters.
Operating
Temperature                          -10°C~+50°C (Operational)
Waterproof                             IPX7 (1 meter underwater for 30 minutes).
Battery                                    User-replaceable CR2032 (3V).
Battery Life                             Around 1 years (based on 1 hour per day usage).







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Conclusion

If you already have sensors, and/or you need power meter data or indoor running data, you’re probably best focusing on iOS fitness and sports Apps since the support is far broader among both apps and devices (basically everything out there supports iOS fitness and sports Apps speed/cadence sensors except Polar devices). Eventually I fully expect to see more support for the Jarv Bluetooth, and look forward to many of the apps that utilize the underlying iOS fitness and sports Apps.

However, as a whole, the sensor marketplace for Bluetooth Smart Device remains extremely fragmented and highly dependent on a handful of apps. Take for example Jarv Bluetooth. They should have their own App to get a better result for their device. Maybe there are working on it in time, development time. It also takes standards, ones that are just barely being supported for the heart rate device profile, and are still not fully finalized for the speed/cadence sensor. No other device profiles exist (i.e. nothing for power meters, running foot pod in beta, etc…) and the timeline to get the device profiles out is very long and slow.










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