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N4XI X1W-2

The 1-Wire™ outdoor humidity and temperature sensor kit was designed to be used with the TAPR T-238 APRS Weather Station or N4XI's Linux based WXN weather server over APRS. It should work with any other 1-Wire™ based software as the design is based on the original Dallas Semiconductor 1-Wire™ Weather station. The humidity sensor with the kit is an improved version over the original part. It has proven stable with good accuracy over a wide range of temperatures and conditions.

The design is flexible in that power for the sensors can be taken directly off the 1-Wire™ bus or from an external power source (as is the case with the T-238 Weather Station or the X1W-1 Inside Sensor/Interface board).

The board also features an aspirator (fan) to improve humidity readings and provisions for an extra temperature sensor. The latter is included to allow experimentation with measuring relative humidity using the wet/dry bulb method.

The X1W-2 kit does not come with an enclosure. The humidity sensor must be protected from strong light and direct exposure to the elements. The mounting centers for the sensor board match up to the Davis Instruments Passive Radiation Shield, #7714. The shield works well. If you do not wish to use the Davis shield, some type of enclosure must be fashioned to house the board and protect the humidity sensor.

What's In A Name?

Why X1W-2? The conceptual designer is N4XI. The X comes from the first letter in the suffix of the call.
1W is for 1-Wire™ and the -2 represents the second kit in the 1-Wire™ kit series.

Ordering Information

Sorry, N4XI X1W-2 Humidity Sensor Kit is no longer available

Assembly and Operations Manual

The assembly and operations manual for the rev 2 kit can be found online at http://www.tapr.org/~n4xi/x1w-2v2/.

If you have the rev 1 kit or PCB, the assembly and operations manual can be found online at http://www.tapr.org/~n4xi/x1w-2/.


TAPR kits can be complex depending on the kitting experience of each builder. We don't think you will have trouble with the kit, but it does require some knowledge and experience to successfully go from a kit to a finished, usable unit, depending on the mode of operations.


View WXN: A Weather Server For Amateur Radio


The TAPR X1W-2 Kit was made possible by the efforts of:
John Bennett, N4XI - Conceptual and PCB Design
Steve Bible, N7HPR - Project Manager
John Koester, W9DDD - Assistant Project Manager
Joe Borovetz, WA5VMS - Parts Liaison
Dwight Hazen, WB9TLH - Beta Tester


1-Wire™ is a registered trademark of Dallas Semiconductor Corporation, a wholly owned subsidiary of Maxim Integrated Products

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