FWIW, I am using a small USB board from a guy named Leo Bodnar to read analog inputs like setpoint potentiometers, it's not used in the servo loop. These boards seems aimed at gaming and flight simulators but work with hal_input.
> -----Original Message----- > From: Dave [mailto:[email protected]] > Sent: den 13 januari 2012 18:47 > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Analogue inputs into EMC2. > > On 1/13/2012 7:57 AM, andy pugh wrote: > > I had an idea of a way to measure analogue voltages with EMC2 a few > days ago. > > > > It ought to be possible for a HAL module to send a sawtooth PWM > signal > > on an output pin, and monitor one or more input pins. Externally a > > PWM-voltage conversion circuit and a bank of comparators would switch > > the input pins when the variable pwm-generated voltage was greater > > than the voltage to be measured. > > > > This is a fairly normal analogue voltage measurement technique, but > > puts the cleverness inside HAL, where EMC2 can see it. > > > > Sampling period would probably be several mS, but that is probably OK > > for many uses. > > > > > > That sounds like a lot of work. If you aren't concerned about speed, a > modbus link to a cheap PLC is hard to beat dollar wise. > > Or what about using an Arduino for Analog I/O? > > Dave > > ----------------------------------------------------------------------- > ------- > RSA(R) Conference 2012 > Mar 27 - Feb 2 > Save $400 by Jan. 27 > Register now! > http://p.sf.net/sfu/rsa-sfdev2dev2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ RSA(R) Conference 2012 Mar 27 - Feb 2 Save $400 by Jan. 27 Register now! http://p.sf.net/sfu/rsa-sfdev2dev2 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
