If you try to use software PWM on a Raspberry Pi Zero expect erratic results. In contrast you can use a 16 channel 12 bit PWM/servo unit from Adafruit and get excellent results.
Have a look at the entrance.py script and it will give you an idea of what you can achieve.
entrance.py.zip (2.8 KB)
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Hi John,
Awesome findings! Thanks for uploading the code and doing some research into the area! 
Just to confirm you were using the Adafruit 16-Channel PWM.
Cheers,
Liam.
I’ve used the bonnet and a Pi Zero.
Adafruit 16-Channel PWM / Servo Bonnet for Raspberry Pi | ADA3416 |
- | - |
The bonnet is very convenient to use. I have 2 more on order (1 to replace the one I took from my 2 amplifier control using micro servos).
I also have a couple of the other boards on order:
Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685
As far as I can tell both the bonnet and the driver versions do the same thing. The Adafruit PCA9685 code is used for the bonnet.
I’m also a big fan of the Adafruit I2C ADS1015 12-Bit ADC - 4 Channel with Programmable Gain Amplifier. It allows lots of accurate measurements.
Regards
John
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