Step 1: check your ANT+ USB key
Step 2: install the ANT+ services
- The ANT Radio Service (which deals with ANT+ channels)
- The ANT USB Service (which deals with the USB key). If you have an internal ANT+ chip (like the Xperia) you don't need this. See here for details on using an Xperia.
Go ahead and do it!
Note that those apps require your Android device to be properly classified by Google Play as one with USB Host capabilities. Some devices, which are host-capable, are not properly classified in Google Play. In that case, unfortunately, the ANT+ services will result "incompatible" with your device and you won't be able to download them. As they're provided by Dynastream, there is little I can do about it - you'll have to find an alternative way to obtain and install the APK (or convince Dynastream to drop the USB HOST requirement from their manifest, as I did for Sportablet).
Step 3: check that everything works
If the dialog does not pop up, your USB key is not being recognized by the ANT+ Service. That's not part of Sportablet, so I can't really help you much on this side. Please check the Google Play page for the two ANT+ Service apps, as there are quite a few hints from users in the comments section.
Now, if you want to double-check that it works, and you have a chest strap that you use with your Garmin, you can also download the free ANT+ Demo from Dynastream. It's a simple app that can connect with a chest strap or a scale and show you some values (it won't connect with your Garmin, just with the HR belt). If the ANT+ Demo works, everything has been set up properly. If you don't have a chest strap, just skip this step.
Step 4: configure your watch
Choose Settings > ANT+ > Computer
Step 5: it's time to run Sportablet!
NOTE: if you're using an Xperia or another device with internal ANT+ chip, remember to click options, and set "Force ANT+ scan" on. This will force the app to try using the internal chip.
Tweaking : )
ANT+ is not particularly good at transferring long sequences of data, and the protocol Garmin adopted on top of it for the 405/410 family does not allow to retry on failures, so the combination is a little flaky on some devices. If you have any problem downloading long activities, Sportablet and the Uploader provides a few settings that you can try (under "options")
- First, make sure that diagnostics is turned off. ANT+ is very time sensitive, and on some devices even the time spent on logging seems to cause problems.
- Next, just enable "Delay Ack". Leave all the other ANT+ options off. This should give the watch a little more time to synch with the tablet during long bursts.
- If that still fails, turn "Delay Ack" off and set "Boost TX power" on.
- If it keeps failing, leave those on and set "Delay Ack" on as well.
- If you still have problems, get in touch.