VMA311 Manual: https://www.velleman.eu/downloads/29/vma311_a4v01.pdf
When I power the device as shown in the picture 5V and GND it works, no problem.
The thing is I can't have it on all the time so I want to power it with a digital pin(13). When I measure the voltage from 13 to GND it's 4.8V. When I plug in the device using 13 as the 5V supply it doesn't work and when I measure the voltage over the device(13 to GND) it shows 2.3V. And there is no voltage between S(third pin on device) and pin 13.
Anyone knows what the problem is?