1-wire weather station
- This article presents a 1-Wire® weather station that solves
many of these problems by transmitting both power and bi-directional data over a single twisted-wire cable. .
. [Maxim Integrated]
1-Wire Weather Station
(Dan Awtrey) - To accurately describe current weather
conditions and predict coming events, meteorologists need reliable data. Much of this information is
collected from weather stations, and forecasters would like to have more of them. The problem is that
conventional meteorological instrument systems are inefficient and expensive. . . . [Dan Awtrey, Dallas
741 Based Light Sensor - The circuit as shown act as a light sensor. Under normal conditions the resistance of the
LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms
and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay. . .
[Tony van Roon's circuit]
Altimeter Project - Making a altimeter using the Basic Stamp II. I finally got my Basic Stamp Pocket Altimeter
done. My first version of my altimeter used a linear equation , which i found is not really accurate at all.
So i got a PAK II math coprocessor to calculate the altitude. Although the PAK II worked like a charm in my
old bulky altimeter, I wanted to make one that was pocket size and the PAK II was just too big. In pocket
altimeter I overcame the Stamp's lack of math capabilties by using a method known as linearization to do the
calculations. . . . [Shaun Wilson]
Amateur weather station
to APRS interface ALWXI-01 - Before putting the WS
APRS interface into operation the network parameters should be set. This can be done using a PC connected to
the ALWXI-01 through a serial interface. Any terminal emulating SW supporting TTY, VT52 or VT100 mode
(HyperTerminal, WTT, etc. ) will do the job just fine. Connect the interface to the PC using a three wire
cross-connected serial cable (RXD<-->TXD, TXD<-->RXD, GND<-->GND). . . [by Aleksander Stare]
An Experimenter's 1-Wire Barometer - This article describes details for constructing a 1-Wire Barometer which will work on a
Dallas Semiconductor Corporation 1-Wire network. . . [David W. Bray]
AN-256: Circuitry for Inexpensive Relative
Humidity Measurement - Application Note. . .
Environmental Compensation on the AD7142: the Effects of Temperature & Humidity on Capacitance Sensors - AN-829 Analog Devices App Note - . . .
Anemometer Circuit - A totally Electronic circuit to measure Air Flow, Zero to 250 feet per Minute That's only
2. 84 MPH, But MAYBE it can be Modified for other Rates of Air Flow. . . . [G.L. Chemelec, designer]
Anemometer Fights Dust -
08/30/01 EDN Design Idea As higher levels of power dissipation underscore the need for cooling, andfans
are finding their way into small electronic enclosures. The dust that fans pull into these enclosures can,
however, cause major problems for high-reliabi. . . [by Jim Christensen, Maxim Integrated Products,
Another One-Transistor Cloud Charge
Monitor - Note: the above charge monitors are really
just toys. Although fun and interesting, their arbitrary zero limits them to monitoring changing fields and
makes them inferior to a mechanical field mill. . . . [Copyright © 1998 Wenzel Associates, Inc.]
Monitor - . . . [electronic design by Lennie Zink]
Lightning Detector - Lightning in a jar. . .
[electronic design by Lennie Zink]
Barometers - Note: the above charge monitors are really just toys. Although fun and interesting, their
arbitrary zero limits them to monitoring changing fields and makes them inferior to a mechanical field mill.
. . . [Copyright © 1998 Wenzel Associates, Inc.]
Cloud Charge Monitor - The Cloud Charge Monitor is an extremely sensitive device capable of detecting subtle (and
not-sosubtle) changes in the accumulated charge overhead. The device consists of a charge-sensing antenna, a
60 Hz notch filter, a self-zeroing integrator, a signal limiter, and a leakage zero adjustment. . . [Charles
Wenzel (unless otherwise noted)]
Connection Tester - A low resistance ( 0. 25 4 ohm) continuity tester for checking soldered joints and
connections. . . [Andy Collison's website]
Dew Sensor - Dew (condensed moisture) adversely affects the normal performance of sensitive electronic
devices. A low-cost circuit described here can be used to switch off any gadget automatically in case of
excessive humidity. At the heart of the circuit is an inexpensive (resistor type) dew sensor element.
Although dew sensor elements are widely used in video cassette players and recorders, these may not be easily
available in local market. . . [designer's name not found]
Sensor - This simple but highly responsive circuit to
protect equipment from dew (condensed moisture) can also be used to prevent condensation on surfaces like
cold water pipes and windows. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]