nanoDLP

FeaLabSCUT

Member

Registered: 2019-10-17

Posts: 2

About the Servo Pulse Width in the Shutter setting

As the Info said:

"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.
Set pulse time length as long as the shutter needs to travel from open to close position."

, the unit of pulse width should be μs. However, the unit showed in the shutter setting is  ms.
I am using a Pi4 and 4k output is set.
It is a BUG? Because I find I can't contrl my servo(model: SG90) through direct contrl by GPIO 12(physical). My setting (machine.json):

"ShutterPin": 12,
    "ShutterType": 1,
    "ShutterMode": 1,
    "ShutterOpen": 500,
    "ShutterClose": 2500,
    "ShutterOpenGcode": "",
    "ShutterCloseGcode": "",
    "ShutterSignalLength": 3000,
"
Best regards ,

Last edited by FeaLabSCUT (2019-10-18 01:16:18)

FeaLabSCUT

Member

Registered: 2019-10-17

Posts: 2

Re: About the Servo Pulse Width in the Shutter setting

My version is V2335.

Last edited by FeaLabSCUT (2019-10-18 01:11:19)

Shahin

Administrator

Registered: 2016-02-17

Posts: 3,541

Re: About the Servo Pulse Width in the Shutter setting

Try this guide.
https://www.raspberrypi.org/forums/view … p?t=245379