photoelectric sensors interfacing with 8051
#1

Please help, how to interface a photoelectric sensor with the 8051 microcontroller for the application of detect the colour of an object ?
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#2

Dr.Y.NARASIMHA MURTHY Ph.D yayavaram[at]yahoo.com Sensors and Interfacing techniquesIntroductionSensors are sophisticated devices which will detect and measure any non-electrical physicalquantity .A Sensor converts the physical parameter (for example: temperature, blood pressure,humidity, speed, etc.) into a signal which can be measured electrically.Sensor is sometimes called a primary measuring element, which can be found simply as amercury thermometer to measure the temperature. It may be embedded in the transducer toperform its function. That means the transducer consists of a primary element (sensor) plus asecondary element (signal conditioning circuit) that transforms the passive change or smallvoltage signal into active signal range that can be easily used in other chains of the control loop.So, we can write that Transducer = Sensor + Signal conditioning circuitThe important characteristics of sensors are Accuracy :High accuracy is needed Environmental condition – The performance of the sensor should not depend on environmental conditions like temperature or humidity etc.. Wide Range –.Measurement limit of sensor . The range should be high. Calibration - Essential for most of the measuring devices as the readings changes with time Resolution – Sensor must be able to detect even small changes in the input signal. Cost- Sensor should not be very expensive. Repeatability – The sensor must be able to reproduce the same output at similar conditions. Linearity : The output of the sensor must be linear .There are various types of sensors available , which measures various physical parameters. Sensor type Physical Parameter Temperature Temperature Light Light / dark Pressure Pressure or barometric pressure or blood pressure Moisture amount of moisture present in air1
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