vibration does't work when Device screen is off

[talantbekov_k]

Hi, I'm working on custom clockface for Fitbit. I need to vibrate my Fitbit device on certain hours. However, device vibration doesn't work when the device screen is off.

I use the following code to initialize vibration at a certain hour.

clock.ontick = (evt) => {
  const today_dt = evt.date;

   const currentHour = today_dt.getHours();

   if(currentHour == 17) {
      vibration.start("ring");

   }

}

Please let me know what I can do to initialize vibration at certain hours?

[Gondwana · Accepted solution]

clock.ontick doesn't happen when the display is off. Use setTimeout.

[talantbekov_k]

Thanks a lot for immediate response!

[Gondwana]

Off the top of my head, Date.now()