I am a complete newbie with PIC Microcontrollers but I have a long
history with electronics and programming.

I bought myself a development/learning board as well as a DS18S20 (My
ultimate goal is a battery operated slave temperature/humidity/light
sensor that can be polled from a master via RF).

A number of examples came with the board and they all work as advertised.

The problem I have is with the DS18S20. It keeps telling me that the
temperature in my house is around 6 degrees C.

There are a lot of example programs on the net for the Dallas 1-wire
DS18S20 temperature sensor and subsequent display on LCD. I have
downloaded a few of these, compiled and programmed the 16F877A in my
dev board. They all produce the same result. I have even tried moving
the output of the DS18S20 to another pin. It appears that the DS18S20
is working as if I hold onto the package with my fingers, the
temperature display rises accordingly (And falls once I let go).

I have to assume that many others have experimented with these
sensors. Have any of you seen this before? If so, what did you do? I
am tempted to just add a constant to the number read but how will
that affect the accuracy?

Any insights most appreciated.




Best Regards




Steve

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