Re: Analog Ports  yes, it's the 47K pullup that's causing the IR's to not work.

slice through the trace connecting the 47K to the sensor input pin on
the underside of the printed circuit board.

fred

In your message you said:
> I have the MTJPRO11 board by Mekatronix as well as the MIT HandyBoard
> both use the 68HC11A1FN mcu. I am using hacked Sharp GP1U58 'tin can'
> detectors so that they output analog voltage from 1.5 to 2.5 ( effective
> 
> proximity range is approximately 4" to 16" when using a 5ma current on
> an uncollimated IR Emitter). The units work quite well with the MTJPRO11
> 
> using any of the PE0-7 analog inputs. They yield A/D values between 88
> and 130 based on the proximity of an object within  4" - 16".
> 
> However, when I try them out on the HandyBoard's analog inputs they do
> not work, all I get is an A/D value of approx 210 which does not change.
> 
> The only difference that I can see between the analog ports on the two
> units is that the HandyBoard uses a 47k pull-up resistor on the input
> pins of the PE port.
> 
> Any suggestions as to how I can use them with the HandyBoard will be
> appreciated.
> 
> Thanks,
> Ranjit
> 
> --
> Ranjit Diol - COMPSys
> Dowagiac,Michigan
> e-mail: rsdiol@mail.com
> website: http://www.compsys1.com
> 
> 
> 

