Usually shutter servo motors require pulse width between 500μs-2500μs for min and max positions. But servo motor tolerates less stress if you use smaller ranges such as 700μs-2300μs.<br>
<br>
Set pulse time length as long as the shutter needs to travel from open to close position.<br>
<br>
<p class="text-danger">Do not wire shutter power to Raspberry Pi itself as it could have negative effect on Raspberry Pi.</p>