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MINI PROJECT ABSTRACT-Embedded based data acquisition system and control with pc interface
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MINI PROJECT ABSTRACT-Embedded based data acquisition system and control with pc interface

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  • 1. Embedded Based Data Acquisition System and control with PC Interface What is Data acquisition systems Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a computer. Data acquisition systems (abbreviated with the acronym DAS or DAQ) typically convert analog waveforms into digital values for processing. The components of data acquisition systems include: • Sensors that convert physical parameters to electrical signals.
  • 2. • Signal conditioning circuitry to convert sensor signals into a form that can be converted to digital values. • Analog-to-digital converters, which convert conditioned sensor signals to digital values. Sources and systems Data acquisition begins with the physical phenomenon or physical property to be measured. Examples of this include temperature, light intensity, gas pressure, fluid flow, and force. Regardless of the type of physical property to be measured, the physical state that is to be measured must first be transformed into a unified form that can be sampled by a data acquisition system. The task of performing such transformations falls on devices called sensors. A data acquisition system is a collection of software and hardware that lets you measure or control physical characteristics of something in the real world. A complete data acquisition system consists of DAQ hardware, sensors and actuators, signal conditioning hardware, and a computer running DAQ software. A sensor, which is a type of transducer, is a device that converts a physical property into a corresponding electrical signal (e.g., strain gauge, thermistor). An acquisition system to measure different properties depends on the sensors that are suited to detect the those properties. Signal conditioning may be necessary if the signal from the transducer is not suitable for the DAQ hardware being
  • 3. used. The signal may need to be filtered or amplified in most cases. Various other examples of signal conditioning might be bridge completion, providing current or voltage excitation to the sensor, isolation, linearization. For transmission purposes, single ended analog signals, which are more susceptible to noise can be converted to differential signals. Once digitized, the signal can be encoded to reduce and correct transmission errors. SYSTEM DESCRIPTION The prototype's hardware includes a 20 MHz crystal, PT, CT, Thermistor, RS232 Interface, Relays and buzzer. This application comprises of Volt, Current, Temperature monitoring mode. The time- base is a 2 ms periodic interrupt derived from Timer1. There are a total of eight tasks, four of which are in the waiting state under normal conditions. There are five events, four of which are dependent upon the status of outside conditions (alarm) and one is required for resource control. The user sets the low
  • 4. and high threshold Voltages and Current, High Temperature Limits using the PC Keyboard. A complete status is displayed on the screen. A Parameter that is not within these parameters will set off the Buzzer, simultaneously displaying the parameter Name with the abnormal condition occurred Under normal conditions, All the Parameters are displayed in the PC Screen.
  • 5. Block Diagram: PIC Microcontroller PIC 16F877 Power Supply Unit Signal Conditioning Unit (FWPR) PT LCD Display Relay Driver Alarm Signal Conditioning CKT for Temp Voltage 1 Current 1 RS232 Keypad Control Frequency Temp CT PT POWER
  • 6. Block Diagram: PIC Microcontroller PIC 16F877 Power Supply Unit Signal Conditioning Unit (FWPR) PT LCD Display Relay Driver Alarm Signal Conditioning CKT for Temp Voltage 1 Current 1 RS232 Keypad Control Frequency Temp CT PT POWER

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