WX200 / WM918 Modifications & Fixes


Problems with Sensors

This is the modification done to Box 1

This 6.8k resistor has been added to Box 1 to remove the cause of one of the problems causing the - - - - in the weather station's display.

Temperature / Humidity Sensor Problems

Sensor problems - RFI

Haven't been able to replicate this effect, however I agree with the general body of opinion that it happens fairly frequently, so I suggest trying the following -

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Sensor problems - Nearby Lightning and Static Discharge

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Sensor problems - Light

This is something I and plenty of others have experimented with. I shone a bright light directly thru a bare sensor PCB to the underside of the surface mount - blobbed micro-controller IC U1. This caused the - - - - in the Weather Station's display. Remove the light, and it works normally again.
This is with both the inner and outer white plastic shells removed, and a fairly bright 160W outside PAR 38 flood lamp shone right onto it. It strikes me that the design of this sensor may need a re-think, as a number of people's sensors work at night or indoors, but fail outside in the daytime.

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More pictures of the insides of the sensor are here.


Updated 00:40 30/10/2001.



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