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Weather Instruments  Page 3
Weather Instruments:  #-D        E-Q       R-U        T-Z

Last Updated on: 
Tuesday, August 18, 2015 06:50 AM


Circuits Designed by Dave Johnson, P.E. :
  • Snow Depth Alarm -  The design of this system alerts a snowplow driver when the snow depth has exceeded four inches. A visible red LED packaged in a 10mm package is pulsed at a rate of about 50Hz with 10uS pulses. Twenty four inches away a phototransistor detects the light from the LED. The LED and the phototransistor are housed in a section of ½ inch PVC pipe, forming a waterproof seal.  . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/18/06]
Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Rain Alarm -  This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. The sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz. . . .  [Radioland.nt.au]

 

Rain Alarm -  This circuit consumes no current until moisture is detected on the rain plate. . . .  [Designer's name not included]

 

Rain Alarm -  This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. The sensor when wetted by water completes the circuit and makes the 555 oscillate at about 1kHz. . . .  [Radioland.nt.au]

Rain Detector -  This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system. . . .  [Circuit designed by Aaron Cake]

Rain Detector -  This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current consumption is low when the buzzer is activated so a couple of AA cells will last a long time. . . .  [Copyright © 1998 Wenzel Associates, Inc.]

 

Rain Detector -  This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system. . . .  [Circuit designed by Aaron Cake]

 

Relative Humidity Sensor Digitizer-Hetrodyne Based -  Hetrodyne Based Humidity Transducer Digitizer Has Grounded Sensor, 2% Accuracy. Capacitively Sensed Hygrometer Beats Humidity Dependent Oscillator (C1) Against Stable Oscillator O1. Difference Frequency Is Demodulated by Q1, Converted to Pulse Form at C2. Counters Scale Output for 0kHz to 1kHz = 0% to 100% Relative Humidity. . .  [Linear Technology App Note - , Mar 16th 2010]

 

Relative Humidity Sensor Digitizer-Time Domain Bridge Based -  Humidity Transducer Digitizer Has Grounded Sensor, 1% Accuracy; Trim Scheme Allows Low Tolerance Sensors. Clocked Q1A-Q1B Configurations Produce Ramp Outputs. Q1A Ramp Slope Varies with Humidity Sensor Value, Q1B Ramp Represents Sensor’s Offset (0% RH does not equal 0pF). C1, C2 Digitize Ramp Times. Gate Extracts Time Difference, Presents 0 to 100 Counts Out for 0% to 100% Relative Humidity . . .  [Linear Technology App Note - , Mar 16th 2011]

 

Relative-Humidity Transmitter uses Single Logic IC -  11/08/01  EDN Design Idea   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 ar. . .  [by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India]

 

Self-Heated Transistor Digitizes AirFlow -  03/13/96  EDN Design Idea   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 ambi. . .  [by Stephen Woodward, University of North Carolina, Chapel Hill, NC]

 

Sferics (spherics) Detector-a fancy lightning detector -  "Sferics" (also spelled "spherics") is short for atmospherics and refers to the crackling static in a radio produced by lightning. This receiver is tuned to an unused portion of the LF band and provides enough sensitivity to detect lightning activity for hundreds or even thousands of miles. Best performance is achieved with an external antenna, but just a few yards of insulated wire is sufficient. A short whip mounted on the unit will work fine for picking up local storms. . . .  [Copyright © 1998 Wenzel Associates, Inc.]

 

Sferics Detector -  . . .  [electronic design by Lennie Zink]

 

Signal conditioning precisely indicates humidity -  02/02/98 EDN Design Idea   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, . . .  [by William Whitehead, Lafayette, CO]

 

Simple Lightning Detector -  . . .  [electronic design by Lennie Zink]

 

Small, portable altimeter operates from a single cell -  06/21/01 EDN Design Idea   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 compen. . .  [by Todd Owen, Linear Technology Corp, Milpitas, CA]

 

Snow Depth Alarm -  The design of this system alerts a snowplow driver when the snow depth has exceeded four inches. A visible red LED packaged in a 10mm package is pulsed at a rate of about 50Hz with 10uS pulses. Twenty four inches away a phototransistor detects the light from the LED. The LED and the phototransistor are housed in a section of ½ inch PVC pipe, forming a waterproof seal.  . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/18/06]

 

Solar Radiation Meter -  . . .  [electronic design by Lennie Zink]

 

Suddent ionospheric disturbance (SID) receiver -  Schematic only, no circuit description included. . . . 

 

System Monitor with Instrumentation-Grade Accuracy Used to Measure Relative Humidity -  A psychrometer is a type of hygrometer, a device that measures relative humidity. It uses two thermometers, one dry (dry bulb) and one covered in a fabric saturated with distilled water (wet bulb). Air is passed over both thermometers, either by a fan or by swinging the instrument, as in a sling psychrometer. A psychrometric chart is then used to calculate humidity from the dry and wet bulb temperatures. This circuit shows the LTC2991-based psychrometer. The two transistors provide the wet bulb and dry bulb temperature readings when connected to the appropriate inputs of the LTC2991. . . .  [Linear Technology App Note - , Jan 30th 2012]


Weather Instruments:  #-D        E-Q       R-U        T-Z


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