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1-Wire Technology Simplifies
Humidity And Temperature Measurement:
12/18/00 Electronic Design - Ideas for Design /
A new 1-Wire technology component, the DS2438
Smart Battery Monitor provides several
functions. Developed by Dallas Semiconductor,
this device offers a unique 64- bit serial
number, an internal temperature sensor, and an
A/D that measures both the. . . |
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741 Based Light Sensor:
CdS photocell used for light/dark controlled
relay |
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Air Pressure Sensor:
Circuit uses a NPP301 pressure sensor. Range of
this sensor is1bar (15psi). It will output40mV
at normal air pressure and3x overload doesnt
damage the device. |
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Circuitry for inexpensive
Relative Humidity Measurement:
National Semiconductor Application
Notes,04-Nov-1995 |
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Cloud Charge Monitor: |
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Electronic Barometers:
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Lightening Detector: |
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Lightning Detectors:
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Liquid Barometers: |
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Low cost anemometer fights dust:
08/30/2001 EDN - Design Ideas / As higher levels
of power dissipation underscore the need for
cooling, more and more fans are finding their
way into small electronic enclosures. The dust
that fans pull into these enclosures can,
however, cause major problems for
high-reliability systems. By coating heat sinks
and electrically charged components, the dust
acts as a blanket that raises the effective
thermal impedance betw... . |
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Low cost relative humidity
transmitter uses single logic IC:
11/08/2001 EDN - Design Ideas / The low-cost
percentage-relative-humidity radio transmitter
in Figure 1 operates in a cold-storage warehouse
for vegetable storage at temperatures of 1 to 5
C. It is generally difficult to collect such
data from a low-temperature area with high
humidity and low illumination. The transmitter
design is simple: It uses a readily available,
capacitor-type percentage-relative-humidity
se... . |
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Measure humidity and temperature
on one TTL line:
08/30/2001 EDN - Design Ideas / 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. . |
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PC hardware Monitor Reports the
Weather: 01/18/01 EDN-Design
Ideas / PDF contains multiple circuits - scroll
to find the one of interest -
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: 04/04/2002
EDN - Design Ideas / Using ac-line power sources
and batteries for remote humidity sensors is
undesirable because these sources can be
troublesome if you mount them in inaccessible
points, such as smokestacks, cold-storage
chambers, or darkrooms, where maintenance is
difficult and inconvenient. Figure 1 shows a
simple way to remove the power source from the
humidity-sensor circuit. . |
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Self Heated Transistor Digitizes
Airflow: 03/14/96 EDN-Design
Ideas |
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Signal Conditioning Precisely
indicates Humidity:
02/02/98 EDN-Design Ideas |
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Simple Circuit Uses Optical Fiber
To Send RelativeHumidity Data
: 04/01/02 Electronic Design -
Ideas for Design / The circuit shown in the
figure measures relative humidity in air at the
low temperatures found in applications like cold
storage of food items and greenhouses. Instead
of using electrical signal cables that... |
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Small, Portable Altimeter
operates From a Single Cell:
06/21/01 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find this circuit.
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Temperature Monitor: |
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Thermistors And A Microcontroller
Simplify Anemometer Design:
10/14/02 Electronic Design - Ideas for Design /
Typically, air flow is measured with a hot-wire
anemometer. Here's an alternative version of
that concept using two thin-film platinum
resistance temperature detectors. A
high-performance mixed-signal microcontroller
can make the measurement and drive. . . |
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Transistor & FVCs Make Linear
Anemometer: 09/26/96
EDN-Design Ideas |
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Transistor Trio Makes Vector
Anemometer: 09/01/97
EDN-Design Ideas |
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Wireless Weather Monitoring
Station: |
