Elbeinlaw - It looks like the DuoTrap S itself is working okay since the light goes on when you spin the wheel. Spin the pedals, too, to very that cadence is working. As I recall, there are two different lights (red and green), one for cadence and one for wheel rotation.

I was intrigued by the problems you've had connecting to a device. I tried using Ride With GPS (RWGPS) installed on an iPhone. I assume that this app is also available on the Samsung platform. You will probably have to set up an accounts (it's free) in order to use it.

Here's what I did:

• Wake up the DuoTrap by spinning the wheel and pedals. Stay within range of the DuoTrap (roughly 30 feet, but I'd stand right next to it to be sure).
• The phone does NOT detect the DuoTrap in the phone's Bluetooth setup menu. Don't worry; we're going to set up the sensor directly in the app itself. (I'm not an expert, but there may be standards lacking at this time for BT on athletic devices.)
• Open RWGPS. Do the following:
  • Go to Settings (down at the bottom of the page)
  • Select Bluetooth and Sensors
  • Select Set up Bluetooth devices
  • You should see the DuoTrap S listed in the devices. Select it.
  • You can enable cadence and/or speed. You probably want to enable both.
  • In order for the speed to work correctly you will have to input you tire circumference in mm. Charts are readily available on line. Here are some common road bike sizes:
    • 700x23 - 2096mm
    • 700x25 - 2105mm
    • 700x28 - 2136mm
  • Save

Go back to the home screen of the RWGPS app. Hit the "Go Ride" button. You'll have to answer a few questions about what metrics you want to see, allow access to GPS, etc., plus you get a brief tutorial on the basic buttons.

Report back if you feel like it.