What looks like a fake finally works by the phone vibration
Not free but i think the 0.99 cent worth if you count how much a motor driven tool would cost .
Some nice DIY for time lapsing goPro shots with a Egg Timer works great too . The Egg Timer cost around 10 € at Ikea
Make a Rotating Time Lapse Base out of an Kitchen Egg timer: GoPro Mounting Tips & Tricks
How it could look like useful for set construction ect
Egg Timer Vs. Go Pro Hero “Timelapse”
Now a Egg timer with 12 hours would be nice for a full day coverage