The circuit posted in #13 was tested on a 3.3 volt 200hz signal with a duty cycle of appx 90% at 11.3 volts and appx 10% at 5 volts out.
Isn't the Arduino capable of that ?

Frequencies are 490, 732, 976, 980, 1000 (Hz) with restrictions on gpio pins that can be used.
In addition, internal supply is 5vdc.

 

Seriously? Meaning you can't program a custom output.

 

Seriously? Meaning you can't program a custom output.

I've used PWM on UNO and NANO.
The ones I quoted are presets, but you can program custom values with some effort (and risk, changing Timers, etc) but some general functionality will be lost. So, in my opinion, its best to use the presents and not customize the frequency(s).

 

IMO it would be much simpler to pick up a simple DC brushed motor aimed at this sort of application where simple PWM could be used.
Johnson versions are all around the WEB and cheap.