Hello,

First, thanks for the lib, it's very useful when working with the IO Pi Plus.

Nonetheless, I'd like to report a bug I faced in lib/iopi.js
I don't have any log report on hand, but the problem is quite easy to see and fix :

l.145, in the function setPinDirection, portAdir is undefined, because a "this." is missing.
The same thing occurs l.148, with the var portBDir.

Hope it helps

I do not quite understand how to pick the min and max values for the pwm. Some questions I have:

• in the servomove demo min and max values are 250 and 500. What is the unit and range of these values?
• what is the significance of the "on" and "off" arguments of setPWM? I would guess it is the high time and low time in a pwm cycle, but then it seems over constrained as the frequency is also set. Also, the "on" argument is always 0 in the example

My servos should be driven at 50Hz and an impulse length between 0.9 ms and 2.1 ms. What should the min and max values be?

Would it be possible to make the extension board Pi Plus work with the 'onoff' gpio library? Onoff is way more advance, since it has interrupt detection.

when i try init:
const releBus = new IoPi(0x20);

releBus stops working, when i remove line const IOBus1 = new IoPi(0x21); it works great