Control DIGITAL COMPASS DESCRIPTION

Basic Description
The digital compass gives measurements based on Earth's magnetic field for robot navigation. Inside this commonly available MEMS are tiny nano-structures that bend due to electromagnetic fields. When this MEMS experiences any form of EM field, the tiny structures bend by an amount which can be electrically detected. Cheaper digital compasses usually have a resolution of around +/- 5 degrees, but newer and better ones can detect with a better accuracy.

Tips and Uses
• Keep digital compasses far away from anything that emits EM, such as motors, transformers, inductors, etc.
• Large conductive items significantly altar magnetic fields (cars, fridges, steel plates, etc.)
• Use this device to help for navigation, such as robot race tracks or navigating a maze
• because the Earth's magnetic lines of flux "dip" in declination, the compass must remain level for the readings to be accurate. Some electronic compasses employ a 2-axis gimbal in an attempt to keep the compass level, but these are problematic in the rough off-road environments

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Schematic Humidity And Temperature Transmitters

Humidity And Temperature Transmitters:-
Item Code:HTTS
Suitable for HVAC application. Wall or duck mounting type.
Range: 0 - 100% RH & 0 - 50 deg C Temperature.
Output: 4 - 20 mADC, supply: 24 VDC
Accuracy: + 2% RH & 0.5 deg C
Vaisala Humidity Sensor
The Vaisala Intercap Humidity and Temperature Probe HMPSO is a simple and cost effective humidity transmitter suitable for volume application on integration into other manufacturer equipment. Because of its very low current consumption and short up 4me. The 4MP50 is well suitable for battery powered applications.A humidity sensor, also called a hygrometer, measures and regularly reports the relative humidity in the air. They may be used in homes for people with illnesses affected by humidity; as part of home heating, ventilating, and air conditioning (HVAC) systems; and in humidors or wine cellars. Humidity sensors can also be used in cars, office and industrial HVAC systems, and in meteorology stations to report and predict weather.A humidity sensor senses relative humidity. This means that it measures both air temperature and moisture. Relative humidity, expressed as a percent, is the ratio of actual moisture in the air to the highest amount of moisture air at that temperature can hold. The warmer the air is, the more moisture it can hold, so relative humidity changes with fluctuations in temperature.
Relative Humidity Sensor: Relative Humidity Sensors for BMS Duct and Room Transmitters www.247able.com
Relative Humidity Sensors:Narrow/wide range resistive, cap. and absolute humidity sensors. www.ohmicinstruments.com
The most common type of humidity sensor uses what is called “capacitive measurement.” This system relies on electrical capacitance, or the ability of two nearby electrical conductors to create an electrical field between them. The sensor itself is composed of two metal plates with a non-conductive polymer film between them. The film collects moisture from the air, and the moisture causes minute changes in the voltage between the two plates. The changes in voltage are converted into digital readings showing the amount of moisture in the air.
iButtonlink Products
iButton and iButtonLink products UK and European reseller www.homechip.com
Thin-film Pressure Sensor
Measure Pressure Distribution with our Tactile Pressure Sensors www.Tekscan.com/Pressure-Sensors
Discuss this Article
You can use a humidity sensor to give an alert of boat leakage, or when your books start being flooded by heavy rain attack on your broken roof, or anything you can imagine. A simple humidity sensor (a humidity probe) can be constructed using two copper wires placed as close as possible to each other, but no touching. This simple circuit can be used to make your simple humidity detector.
Auto SensorWeather InstrumentsRH SensorWeather Barometer
Humidity SensorWireless Humidity SensorIndustrial Humidity SensorDigital Humidity SensorHigh Temperature Humidity SensorHome Humidity SensorElectronic Humidity Sensors
Humidity Sensor
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Interfacing humidity sensor can be difficult because of the sensor’s drive requirement and their wide dynamic range. We can customize the circuit to obtain reasonable accuracy within the chosen range by carefully selecting the devices that comprise the analog front end. Here we present a case study to design analog signal conditioner for Phys-Chem Scientific Corp.1 model EMD-200o humidity sensor.
The Phys-Chem sensor is an accurate resistance-type relative humidity (RH) sensor that is small and low cost. The system utilizing this sensor would be easily maintainable, since we can replace the sensor without recalibration, as the sensor has a well-defined stable response curve. The high performance of this sensor requires a high precision analog front end with only few calibration tweaks, but must be low cost and works with 5 volts supply. A sine or square wave with no DC component is required for the excitation of this sensor. Also, this sensor has very wide range of dynamic reactance (700 Ohm to 20MOhm). This wide dynamic range (about 90 dB) introduces design challenge to obtain full RH range performance.



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