Weather Instruments Circuits
Air Pressure Sensor: Circuit uses a NPP301 pressure sensor. Range of this sensor is1bar (15psi). It will output40mV at normal air pressure and3x overload doesn't damage the device.Circuitry for inexpensive Relative Humidity Measurement: National Semiconductor Application Notes,04-Nov-1995
Cloud Charge MonitorElectronic BarometersLightning Detectors 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
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.
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.
PC hardware Monitor Reports the Weather: 01/18/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest.Rain Detector
Remote humidity sensor needs no battery: 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.Self Heated Transistor Digitizes Airflow: 03/14/96 EDN-Design Ideas
Signal Conditioning Precisely indicates Humidity: 02/02/98 EDN-Design IdeasSimple Circuit Uses Optical Fiber To Send Relative Humidity 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.
Small, Portable Altimeter operates From a Single Cell: 06/21/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.Temperature Monitor
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.Transistor & FVCs Make Linear Anemometer: 09/26/96 EDN-Design Ideas
Transistor Trio Makes Vector Anemometer: 09/01/97 EDN-Design IdeasWireless Weather Monitoring Station
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