This is my first robot ever.
Is not connected in the photo ........
I have some problems with it.
You might want to use the arduino servo library.
Be used to control full rotation servos? I thought that it cannot.
If you send pulses to a modified servo, what will happen is it will try to move towards the position the pulse indicates, but since it never gets any feedback, it keeps moving. It moves faster when you send it to extreme positions.
At least, that's how my modified servos work when I run them with code meant for unmodified servos.