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AN-256: Circuitry for Inexpensive Relative Humidity Measurement - National
Semiconductor Application Note (app note added 2/06) |
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AN-829: Environmental Compensation on the AD7142: The Effects of Temperature &
Humidity on Capacitance Sensors - AN-829 Analog Devices Application Notes
(app note added 6/06) |
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Circuit Tests Power Outage Susceptibility - 03/03/97 EDN-Design Ideas: (design
idea added 3/03) |
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Circuitry for Inexpensive Relative Humidity Measurement - National Semiconductor
Application Note (app note added 6/06) |
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Connection Tester - A low resistance ( 0.25 4 ohm) continuity tester for checking
soldered joints and connections (added 09/05) |
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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. However, the same can be procured from.... (added
10/05) |
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Environmental Compensation on the AD7142 - AN-829 Analog Devices Application Notes
(app note added 6/06) |
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Low cost relative humidity Transmitter uses single logic IC - 11/08/01 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.....(design idea added 1/05) |
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Measure humidity & temperature on one TTL line - 08/30/01 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.....(design idea
added 1/05) |
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Remote Humidity Sensor needs no Battery - 04/04/02 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.....(design idea added 1/05) |
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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 added 4/02) |
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Tiny Dew Sensor - (electronic Circuit / Schematic added 10/04) |
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Transmitter senses triple relative humidity figures - 09/26/02 EDN-Design Ideas:
The circuit in Figure 1 is a triple, relative-humidity sensor and radio transmitter.
Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz,
respectively, at relative humidity of 50%. The gated oscillators use variable
resistances R2 and R3, respectively. Together, these two oscillators generate FSK-modulated
outputs at output of IC1B, Pin 6.....(design idea added 1/05) |
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Wireless Temperature & Humidity Sensor with USB - this project is based on obdev's
RemoteSensor example and their firmware-only USB implementation; the main change is
the replacement of the analog sensors with a Sensirion SHT11 digital temperature and
humidity sensor…(added 07/07/07) |
