Presentation trigger level trigger polarity Controller Cont…

Presentation on LAPTOP SCREEN AS A CRO By: Dhruv R Patel (C0699545) Tushar R Patel (C0703699) Subject: Project Preparation (ESE 3002) TABLE OF CONTENT Problem definition Problem solution Implementation Hardware description Software Future plan work schedule Application Reference PROBLEM DEFINITION “As we know for circuit testing, waveform observation, to measure different parameters of a signal we are using the cathode ray oscilloscope. which is large in size & cost is very high. So it’s not portable & not affordable for individual.” “To make CRO portable and affordable we are using the computer screen as a display instead of cathode ray tube.” PROBLEM SOLUTION Implementation block diagram Input Channel 1 Input Channel 2 TWO INPUT CHANNEL There are two input channels consisting of frontend amplifier which converts input signals into particular range by Amplifying or Attenuating and also adjust the Offset. ADC The ADC converts the analog input signals into its equivalent digital signal. The sampling process is carried out within a particular input signal range by ADC. Cont… The controller sets the signal gain signal offset sample logic select trigger source trigger level trigger polarity Controller Cont… As you can see, the dsPIC30F2020 microcontroller allows to implement most of it without external circuitry – controller, memory, sample logic, analog-to-digital converter (ADC), trigger and trigger level control all reside within a single chip. This makes the design very compact, inexpensive, and easy to build. USB interface to the PC as well as power supply for the scope are provided by the FTDI232R serial-to-USB converter cable – again a very user-friendly solution since there is nothing to assemble. PIC Microcontroller (dsPIC30F2020) Programmable gain amplifier IC (MCP6S22) Simple operational amplifier (MCP6024) 12 bit dual DAC (MCP4822) USB interface (FTDI) Computer or laptop Basic electronics component BNC connector HARDWARE DESCRIPTION The MCP6S26 Programmable Gain Amplifier 1, 2, 6 or 8 input channels and eight steps of gain. Programmable over an SPI bus and add gain control and input channel selection Greater bandwidth at a low supply current. Operating voltage Range 2.5 to 5.5v Programmable Gain Amplifier Operational Amplifier Current Amplifier Low Offset Voltage 10MHz Gain Bandwidth Product Unity Gain Stable Specified over the Extended Temperature Range Small 14-pin TSSOP Package Operating voltage Range 2.5 to 5.5v 12 – bit Dual DAC 12-bit Resolution Dual Channel Voltage Output 2.7V to 5.5V Operation SPI Interface 8-pin PDIP USB interface (FTDI) The USB TTL Serial cables are a range of USB to serial converter cables which provide connectivity between USB and serial UART interfaces.  A range of cables are available offering connectivity at 5V, 3.3V or user specified signal levels with various connector interfaces.  All cables feature an FTDI FT232R device integrated within the cable USB type ‘A’ connector, which provide access to UART Transmit (Tx), Receive (Rx), RTS#, CTS#, VCC (5V) and GND connections.  All cables are fully RoHS compliant and are FCC/CE approved. The BNC (Bayonet Neill–Concelman) connector is a miniature quick connect/disconnect radio frequency connector used for coaxial cable. BNC Connector SOFTWARE VIEW COST AND FUTURE PLAN Future plan Software simulation Hardware implementation Hardware and software interfacing Practical observation troubleshooting cost PIC Microcontroller (dsPIC30F2020) – $8 Programmable gain amplifier IC (MCP6S22) – $2 Simple operational amplifier (MCP6024) – $3 12 bit dual DAC (MCP4822) – $5 USB interface (FTDI) – $20 Basic electronics component – $15 BNC connector – $5 total cost will be around – $60 to $70 from Work week Tushar/Dhruv Simulation of Input stage(proteous) 1st week Tushar Amplifier stage simulation(proteous) 1st week Dhruv Trigger circuit simulation(proteous) 2nd week Tushar Logic analyzer circuit simulation(proteous) 2nd week Dhruv USB connections 3rd week Tushar and Dhruv Hardware implementation of input stage and trigger circuit (breadboard) 4th week Dhruv Hardware implementation of amplifier stage and logic analyzer circuit(breadboard) 4th week Tushar Hardware Assembling (component placing and soldering) 5th week Tushar and Dhruv Hardware and software interfacing 6th week Tushar and Dhruv Troubleshooting 7th week Tushar and Dhruv Work schedule To test circuit To observe waveform To compare two signals To measure voltage level To measure time interval To measure frequency APPLICATION MILLMAN’S INTEGRATED ELECTRONICS OP-AMPS AND LINEAR INTEGRATED CIRCUIT TECHNOLOGY BOOK BY RAMAKANT A.  GAYAKWAD REFERENCE THANK YOU

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