Re: [Paparazzi-devel] comparison between I2c and PWM Esc (evan igor)

[Sergey Krukowski]

So far the I2C bus is truly digital, the commands to motor controller are  
very definitive, so the motor controller can better follow the AP  
commands. However this solution requires very carefull schema for a stable  
work. Also the bus speed must be as low as possible, though it's pretty  
difficult with a large rotor number. But sometimes non of this works with  
a particular ESC, and the bus doesn't work stable.
What concerns PWM, the PWM signal is interpreted very ESC type dependent.  
For example, I've had really weird stuffs with MKK controllers and PWM  
signal. Each controller was working with a completely different PWM level,  
so it was a real challenge to set them to work properly. However if you  
are not using cheap noname PWM ESCs, everything should be ok. And it's  
also necessary to calibrate it's turn on PWM level. But in general PWM  
solution is more reliable. And the best thing there is that there are lots  
of different ESCs available with wide voltage and current range.
Regards,
Sergey