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He works primarily with embedded systems and microcontroller-based applications. cn. com/pub/Circuit_Cellar/ 2003/151/. 0, 1998. 0, 1996. org SOURCES AT90S8515 and AT45D021 Atmel Corp. com Sandpiper GPS receiver Axiom Navigation, Inc. com Issue 151 February 2003 37 FEATURE ARTICLE Ken Macleish A Wireless Indoor/ Outdoor Humidity Meter h Fascinated by weather instrumentation, Ken recently built an indoor/outdoor humidity meter with several basic components and a few PIC micros. In this article, he describes how to build the separate indoor and outdoor units and how to make them aesthetically pleasing.

Dan is an ophthalmologist who has good woodworking tools and knows how to use them. 5-mm automatic pencil that he had constructed from a rare wood. com through a red filter that is cemented into the front panel bezel. A dot at the lower right corner of the LED (normally a decimal point) is lit when the outdoor humidity is being displayed. Changing from outdoor to indoor humidity, or vice versa, is done by momentarily pressing the button on the back of the unit. The The indoor unit displays relative humidity from 0 to 99%.

SMS is a bidirectional service for sending short alphanumeric (up to 160 bytes) messages in a store-and-forward fashion. If the only data received is time and position, then the data can be displayed on a digitized map and also recorded in a database file; the recorded information can be replayed later for debriefing or evaluation of a mission. The hardware block diagram is shown in Figure 1. , LCD and buttons), and all other parts. The GPS module receives the GPS signals and outputs the data to the AT90S8515 microcontroller via a TTLlevel asynchronous serial (UART) interface.

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