Hey guys I have a problem arduino is connet usb to pc and my shield ( adafruit shield) connect to 9 V power supply when I work the system the power supply is not work and system working only pc power . Why is this happening pls someone help me .

Quote from sandy on November 30, 2017, 22:33
Adafruit have an excellent, world-class forum with the specific purpose of supporting Adafruit products - try there first and come back if you're having problems with Polargraph.

I tried the adafruit shield with different codes and power supply and adafruit shield work together but when I upload polargraph code arduino , adafruit shield still working but I going to polargraph and set home then the power supply doesn't work and system only work pc to arduino power .

Yes it's hard to help when you haven't told us anything concrete.

Which firmware are you using? Compiling yourself or using a pre-compiled .hex file?
Did you edit the firmware before uploading it?
Which controller software are you using? Compiling it yourself or running from a pre-compiled binary?
In the controller, can you connect to the arduino ok? Do you see "READY" appearing in the console log (ctrl+c to open the log)?
When you issue the "set home" command, do you see any response message in the log?
Does the pen lift work? Pen up / pen down.

The motors should move slightly, and lock when you send a "set home".