Posts Tagged ‘gps’

Getting Cadence Data While Spinning

Wednesday, July 15th, 2009

UPDATE: Checkout the results of 18 months of spinning on Google Earth HERE

Do you use a GARMIN Forerunner 305 to monitor your heart rate while spinning? Are you interested in cadence training? The following details how you can use your GARMIN Forerunner and other devices that use a wireless connection to collect cadence data, without modifying your spin bike at the gym/sports center.
thekitsofstuff
First you need the “GARMIN Speed/Cadence Sensor (GSC 10)” which connects wirelessly to the Forerunner 305. Normally this is connected permanently to your road bike. In this project the goal is to be able to use it in a spin class on a spin-bike shared with others.

Bill of materials:

  • Garmin Forerunner 305
  • Garmin GSC-10 Monitor and magnet
  • 2″x4″ metal bracket
  • 2- 4″ cable ties
  • medium binder clip
  • thin no-skid carpet pad
  • Aluminum seam binder or doorway strip 36″
  • 12″ Elastic shock cord(not shown)
  • rubber cement (not shown)

the bracket

Drill a hole or two depending on the size of the bracket that are close to the bottom edge to mount the cadence monitor as shown below using the cable ties.

mountedcounter

You may need to adjust the positioning of the “Speed Sensor” the arm that sticks out to match the positioning shown. The “speed sensor” is not needed.

holdingbar

Cut a strip of the no-skid carpet pad to the width of the aluminum binder/strip. The the photo above the strip had been bent to the shape of the chain guard of the spin bike and the padding has been glued using rubber cement. The padding is aligned with the portion that is in contact with the bike.

mountedonbarwithcounter

Use the binder clip to attach the cadence monitor to the strip.

mountedonbike

Now the assembly can be mounted on the spin bike using the shock cord. The overall length of the bar/strip may need to be shorten depending on the spinbike.

detailonbike

In this photo you can see the magnet on the pedal and cadence monitor below the bar. The trick is to align the magnet with the sensor. The magnet is strong enough to hold on to the pedal, a twist tie can be used if necessary.

onthehandlebar

Mounting the Forerunner on the handle bar is easy, using a short section of pipe winterizing foam.

Follow the directions, that came with the cadence unit, for setting up the Forerunner to sync with the cadence monitor. Give the pedal a spin and then check to see if the unit is syncing with the watch, you may need to make some adjustment to get the right alignment.

When running on a stationary bike it is important that the mode of recording is changed from “Smart Recording” to “Every second”, as “Smart Recording” using distance travels to determine when data is actually recorded. (Settings -> General -> Data Recording(scroll to bottom).

heart-cadence

This setup allows for some flexability in how the part are connect. Once familar with the setup and alignment a more permenent connection between the backet with the Cadence unit and the bar strip is recommended. Lastly after a good workout it is easy to forget the magnet that is on the pedal, I added a label to the bar “Remember the Magnet”, (note: on Amazon I found a source that sells a kit with replacement magnets.)