Although using xTimer is as easy it can get there are some mistakes you could make and usually when there was missed split time or data is not received any of the following mistakes happened.
Not wearing good fitting cloths
To get maximal precision xTimer uses infrared light. And just like it is with lasers when it is covered it does not work.
Wear fit clothes that do not cover the sensors
Wear the Receiver around your waist or chest
Autosave does not work
If you have enabled autosave function in settings and want xTimer app to autosave the data you have to keep your phone awake all the time. This means disabling the auto-lock function. In order to save battery, we suggest lowering display brightness and keeping power bank close.
Disable auto-lock on your mobile device
Lower the screen brightness
Keep your phone charging using power bank
Not having mobile device at the start when using the start button
When using the Start button always have a mobile device with opened xTimer app at the beginning of the track. The mobile device should be in the range of 10 meters from the athlete. The signal from the start button is transmitted and processed through a mobile device. If the mobile device will be at the finish line, the athlete using the Start button will not get the starting signal.
When using the Start button always have the mobile device at the beginning of the track
Do not lock your phone and keep your app opened all the time when you are using the Start button