The 127 position knob is also a Bourne. The 64 position knobs also cost $50 each. So for 8 inputs that's 8 rot. enc.'s. Forget the fact that I need a $10-15 PIC for every couple of encoders in your scheme just the rot. enc.'s would be US$400. Not quite the price range I was looking for. I gather you mean the Absolute Contacting Encoder with 128 pos. (there are 64 pos. opticals but there US$50 like the 128 pos ones) which are only AU$20 ea (from Farnell, 1+) which is better. But I still can't afford $160 for the knobs alone. At 25+ they are $15 but that's still a little steep. Anyone know a cheaper supplier accessible from Australia? Looking at $3-5 for analog pots so would be interested in around $10ea absolute max. Looking for about 10 to start but I might go up to 25 if there were significant savings to be made. Otherwise analog it is. Tom. ----- Original Message ----- From: Peter Homann Subject: Re: [OT}Rotary Encoders (was Re: A/D Challenge) > Hi, > I've used rotary encoders from Bourne that have 64 transitions per rev. > Why not use one of the 8 pin PICs to look after each encoder. > Regards, > Peter. > > Peter Homann email: peterh@adacel.com.au Work : +61 3 8530-7755 > Adacel Technologies Ltd Fax : +61 3 9596-2960 > 250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 041 4494578 > http://www.adacel.com.au Australian Software Engineering Excellence > > -----Original Message----- > > From: pic microcontroller discussion list > > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Thomas Brandon > > Sent: Monday, 13 September 1999 10:52 > > To: PICLIST@MITVMA.MIT.EDU > > Subject: [OT}Rotary Encoders (was Re: A/D Challenge) > > > > > > I am investigating a similar project. The project is a MIDI > > knob box. Currently I am considering an A\D converter (external) > > and an analog MUX. However digital knobs would be much better as: > > 1) I don't have the conversion time overhead. > > 2) I don't have to worry about an analog section and isolating it etc. > > 3) No A\D accuracy problems > > However rotary encoders have the following problems: > > 1) Dealing with multiple active knobs > > 2) Accuracy > > Can anyone suggest a digital knob solution with a reasonable > > cost and a > > method of dealing with multiple active knobs. > > > > Tom.