Control Digital Light Sensor to Microcontroller Circuit

This is a design circuit for digital light sensor circuit using microcontroller. The ISL29001 is an integrated ambient light sensor with ADC and I2C interface. With a spectral sensitivity curve matched to that of the human eye, the ISL29001 provides 15-bit effective resolution while rejecting 50Hz and 60Hz flicker caused by artificial light sources. This is the figure of the circuit;

 

In normal operation, the ISL29001 consumes less than 300µA of supply current. A software power-down mode controlled via the I2C interface disables all but the I2C interface. A power-down pin is also provided, which reduces power consumption to less than 1µA. The ISL29001 includes an internal oscillator, which provides 100ms automatic integration periods, or can be externally timed by I2C commands. Both the internal timing and the illuminance resolution can be adjusted with an external resistor.

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Control Compass Sensor Circuit Using Microcontroller Project

This circuit is design circuit to build a digital compass that displays both the direction and cardinal points on a television. Other functionalities were added to complement the sensor interface, such as, temperature display, magnetic declination input and disability option. This is the figure of the circuit;

The HMC1052 two-axis magnetic sensor contains two Anisotropic Magneto-Resistive (AMR) sensor elements in a singleMSOP-10 package. Each element is a full wheat stone bridge sensor that varies the resistance of the bridge magneto resistors in proportion to the vector magnetic field component on its sensitive axis. The two bridges on the HMC1052 are orientated orthogonal to each other so that a two-dimensional representation of an magnetic field can be measured. The bridges have a common positive bridge power supply connection (Vb); and with all the bridge ground connections tied together, form the complete two-axis magnetic sensor. Each bridge has about an 1100-ohm load resistance, so each bridge will draw several milli-amperes of current from typical digital power supplies. The bridge output pins will present a differential output voltage in proportion to the exposed magnetic field strength and the amount of voltage supply across the bridge. Because the total earth’s magnetic field strength this very small (~0.6 gauss), each bridge’s vector component of the earth’s field will even be smaller and yield only a couple milli-volts with nominal bridge supply values. An instrumentation amplifier circuit; to interface with the differential bridge outputs, and to amplify the sensor signal by hundreds of times, will then follow each bridge voltage output.

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Control The Smart 4-20mA Transmitter

A smart 4-20mA transmitter included a field-mounted device that sensed a physical parameter and generated a proportional current in the standard range of 4-20mA. Responding to industry demand, the second generation 4-20mA transmitters, called 'smart transmitters', use a microcontroller (μC) and data converter to condition the signal remotely. Smart transmitters can normalize gain and offset, linearize the sensor by converting its analog signal to digital (RTD sensors and thermocouples, for example), process the signals with arithmetic algorithms resident in the μC, convert back to analog, and transmit the result as a standard current along the loop. This is the figure of the diagram smart transmitter;

The newest third-generation 4-20mA transmitters are considered 'smart and intelligent'. They add digital communications which share the twisted-pair line with the 4-20mA signal. The resulting communication channel can transmit control and diagnostic signals along with the sensor data.

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Control Digital Thermometer Using LM35

The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55ºC to +150ºC and a accuracy of ±0.5ºC . The output voltage is 10mV/ºC . The output voltage is converted by the AD convertor of the AT Mega8. The temperature is displayed on an LCD module. In this example the thermometer has a range of 0ºC to 40ºC and a resolution of 0.5ºC. If you want to have a read out in Fahrenheit you can use the LM34.

This is a design for digital thermometer that can display using LCD. This is the figure of the circuit.

In the circuit the LM35 is connected to the ADC port of the ATMega8. The ATMega8 uses a crystal as an oscillator for the clock pulses. At PORTD of the ATM8 an 20x4 LCD display is hooked to display the temperature in a discrete value and in a analog bar.

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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
Introduction 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...
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Signal Conditioning Circuit for KMI 15/x Rotation Speed 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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Control Light Sensor Circuit Using Programmable Gain Amplifier

This light sensor circuit that is photos sensor is the gap between light and electronics. This circuit is built by op amp and microcontroller PIC16C63 for control the sensor. This circuit is not precision application, but they can be effectively used in position photo sensing applications minus the headaches of amplifier stability. This is the figure of the circuit.


When the two, six or eight channel PGA is used in this system, the other channels can be used for other sensors or an array of photo sensors without an increase in signal conditioning hardware or PIC micro® microcontroller I/O pin consumption. The multiplexer and high-speed conversion response of the PGA / Analog-to-Digital (A/D) conversion allows the photo sensor input signal to be sampled and quickly converted to the digital domain. Switching from channel to channel is then easier with the Serial Peripheral Interface (SPI) from the PIC16C63 microcontroller to the PGA. The PGA can be configured with a photo sensor in two different settings. These circuits are appropriate for signal responses from DC to ~100 KHz. [Schematic circuit source: Microchip Technology, Inc]

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