Cheap PC (W9x..XP) interface
for SHT11 humidity sensor


UPTO 50 sensors 1-wire network

Left side of the scheme shows flat cable connections between MAX233 and
SHT11 (C=clock, D=data, run supply cables between them to prevent crosstalk).
Right side of  the scheme shows connections between MAX233 and serial port 
(com 1 or 2) with shielded serial cable.
According to RS232 specs a length of 15 m is possible.

Parts: 2 diodes (1N4148), 1 resistor (10K), 1capacitor (1uF, 6.3V)

Software (CRC included): here

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