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Weather Instruments
Page 3
Weather Instruments: #-H
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M-Z
Last Updated on:
Sunday, May 19, 2013 04:50 AM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Measure humidity and temperature on one TTL line - 30-Aug-01 Issue
of EDN By combining the responses of an Analog Devices (www.analog.com]
AD590 temperature sensor and a Humirel (www.humirel.com] HS1101 humidity
sensor, you can generate a single TTL-level signal containing information
from both sensors (Figure 1). This design uses a 74HC123 monostable
multivibrator, IC1, to form a free-running oscillator.... [Design Idea by
Shyam Tiwari, Sensors Technology Pvt Ltd, Gwalior, India] |
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PC hardware monitor reports the weather 01/18/01 EDN-Design Ideas....You
usually use PC hardware monitors to keep a close eye on powersupply voltage
levels, the speed of system cooling fans, and even the temperature of the
CPU.….PDF has several circuits, scroll down…. [Design Idea by Sean Gilmour,
Analog Devices, Limerick Ireland] |
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Remote humidity sensor needs no battery - 4-Apr-02 Issue of EDN
Using ac-line power sources and batteries for remote humidity sensors is
undesirable because these sources can be troublesome if you mount them ....
[Design Idea by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior,
India] |
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Self Heated Transistor Digitizes AirfLow - 03/14/96 EDN-Design Ideas....A
sensitive and reliable way to measure airflow is to exploit the predictable
relationship between airspeed and the heat dissipated by a sensor exposed to the flow
while being held at a constant temperature differential above ambient. The power
required to maintain the elevated sensor temperature is proportional to the square
root.... EDN is migrating links. This link is not verified. Search the "title" +
"EDN" for new link. |
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Signal Conditioning Precisely indicates Humidity - 02/02/98 EDN-Design
Ideas....The circuit in Figure 1 translates the level of humidity from0 to 100% into a
stable, respective dc signal of0 to 100 mV. The heart of the circuit is IC1, the
IH3602-C relative-humidity sensor (Microswitch/HyCal Sensing Products, Freeport, IL].
This device operates on 5V at 200 mA and provides a dc output of0.8 to 4.0V....
[Design Idea by William Whitehead, Lafayette, CO] |
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Small Portable altimeter operates from a single cell - 06/21/01 EDN-Design
Ideas....Some sports enthusiasts want to know altitude changes from an initial
elevation. A small, lightweight, portable altimeter is easy to design using modern
micromachined pressure transducers. Inverting barometric pressure and compensating for
nonlinearities in air-pressure changes…several designs included, scroll to find this
one.... [Design Idea by Todd Owen, Linear Technology Corp, Milpitas, CA] |
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Suddent ionospheric disturbance (SID) receiver - Schematic only, no circuit
description included…. |
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Temperature Monitor - Using a thermistor in the position shown makes a heat
activated sensor. A change in temperature will alter the output of the opamp and
energize the relay and light the LED. Swapping the position of the thermistor and 47k
resistor makes a cold or frost alarm.... [Andy Collison] |
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Transistor & FVCs Make Linear Anemometer - 09/26/96 EDN-Design Ideas....The
basic operation of this front-end sensor is identical to that of the earlier circuit.
Q1 is the self-heated airflow sensor; Q2 senses ambient temperature. Zero-adjust
resistor R2 sets the zero-airflow quiescent bias currents for Q1 and Q2. With proper
adjustment of R2, the temperature rise of Q1 from its collector power dissipation....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Transistor Trio Makes Vector Anemometer - 09/01/97 EDN-Design Ideas....A
previously published Design Idea (Reference 1] uses a heated transistor as an
airspeed-to-frequency converter. Because it uses only one transistor, the circuit
cannot determine the direction of airflow. Alternatively,.... [Design Idea by W
Stephen Woodward, Chemistry Department, University of North Carolina--Chapel Hill] |
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