> I can think of several ways to overcome this problem - mostly having to
> do with either attaching inverters/transceivers to the sensors, fitting
> each with a small PIC to handle cleverer encoding schemes, or both, but
> the system has to ship in a month and I wouldn't like to over-engineer
> it if some common practice for handling long range transmission of
> originally inter-IC protocols exists.

1. a PIC near to the sensor, use RS485 to transmit the data, with error 
detection/retransmission, or transmit N times 9with checksum), or 
(another) form of forward error correction.

2. check I2C transceivers, like P82B715

3. Use SPI, with whatever buffer seems appropriate. maybe simple HC TTL, 
maybe RS4xx, etdc.

Note that 2. and 3. might need some coding on the (remote) PIC to detect 
and correct errors.


-- 

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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