Re: Re: Re: BL2100 Expansion headers (LCD) to add extra IOs
Stan Hsu <stanley_hsu-/[email protected]>
| Newsgroups | gmane.comp.hardware.rabbit-semiconductor |
|---|---|
| Message-ID | <[email protected]> |
Hi Dave. Thanks for the ideas... Stan On Wednesday, November 6, 2013 8:34 PM, "[email protected]" <[email protected]> wrote: Stan, That one is a little more complex. You would need: Analog conditioning for the A/D (op amps) A/D converter (SPI interface) Parallax makes some 2 and 4 channel. SPI requires 4 data lines. (one input, 3 output). You would need a 74HC245 on the data bus. Then two 74HC541 to act as latches, one input; one output. Some address decode. Not a complicated system, but a number of chips. -- Easy way. If you can work with PIC (Microchip) controllers, use one with A/D and interface to the Rabbit with RS485 or 232. That is faster and the work load for the A/D conversion is off loaded. Dave >Hi Dave. > >I would like to add more than digital IO. Any success with analog inputs? > >Thanks. > >Stan > >On Wednesday, November 6, 2013 3:47 AM, "[email protected]" wrote: > > >The answer is yes. I have several designs that do just this. > >Only limitation is the missing R/W line, so I have some ports as outputs and others as inputs. > >Let me know if you want schematics. > >Dave > >> I was wondering one thing. We are thinking about making a small board to add on extra IOs and using it with the expansion headers on the BL2100. I can see from the dwg that there is PE7, A0-A3, and DB0-Db7. So it seems like I can not use this using AuxIO because the IO bus PA0-7 is not available at the header. >> >> Just curious if anyone has ever tried to add IOs (analog and digital) to this by adding a board and trying to use the PE7 and also the DB0-DB7 available. >> >> Aux IO is not difficult to program but without it, it seems it will be much slower. Dont know, I have not done much ASM so I do not know how fast doing 8 bit readings would be. >> >> Just wanted to see if anyone out there has any experience trying to do this. >> >> Thanks >> >> Stan the man... >> >> ------------------------------------ > > ------------------------------------ Yahoo Groups Links http://info.yahoo.com/legal/us/yahoo/utos/terms/