cycling power meter Archives - Cykelstrom Bicycle Power Meter App

This video demonstrates the Cykelstrom Cycling Power Meter App for Android smartphones while riding on rural country roads in northeastern Wisconsin.

Accuracy For This Ride

The best accuracy for this ride is highlighted in bold.

Sensors	Crank Power Meter (Watts avg.)	Cykelstrom (Watts avg.)	Difference (Watts)	Margin of Error (Watts)
External Speed and Cadence	134.59	140.93	6.34	+/- 1.57
GPS Speed and Cadence	134.59	137.25	2.66	+/- 1.53
External Speed Only	135.01	148.98	13.97	+/- 1.74
GPS Speed Only	135.01	145.05	10.04	+/- 1.69

Table created using Bland-Altman Analysis using a 4iiii Precision Pro dual sided crank power meter as the standard with 95% confidence level.

Discussion Of This Ride’s Results

I am pleased with the results of this ride as it shows that the Cykelstrom Cycling Power Meter App is giving me consistent results when riding the same course repeatedly. Cykelstrom displays the best results when paired with an external cadence sensor. To learn how to configure a cadence or other sensors with Cykelstrom visit Adding Bluetooth Sensors to Cykelstrom.

Cycling Power Meter App Uses Smartphone Sensors

Most smartphones have sensors that measure motion. The sensor combination is called an inertial measurement unit or IMU. The IMU is composed of accelerometers and a gyroscope that provides information about the smartphone’s orientation relative to the Earth’s surface. In addition to the IMU, most smartphones have a magnetometer and global positioning system. The magnetometer provides compass like direction information. The global positioning system provides provides location, direction, and speed information. The smartphone may also have a data link to a weather information service. With information from the sensors, GPS, data link, some clever math and empirical evidence Cykelstrom estimates how much power the cyclist generates.

Strava Activity

Click on the map to visit this activity in Strava. Follow me on Strava to see more Cykelstrom Activities that were automatically uploaded. To learn how to configure Cykelstrom to automatically upload your rides visit Upload Your Ride Data to Strava.