2-Channel PC Based 2-Channel PC Based OscilloscopeOscilloscope

Project Members:-

Arun SharmaArun Sharma

Annu KarirAnnu Karir

Anjali GargAnjali Garg

Apurv AgarwalApurv Agarwal

Project Guide:- Mr. Vipul BhatnagarProject Guide:- Mr. Vipul Bhatnagar

What is an Oscilloscope?What is an Oscilloscope?

Oscilloscope is an Electronics test instrument used for the purpose of analyzing the constantly varying voltage waveforms.

What is a PC-Based What is a PC-Based Oscilloscope?Oscilloscope?

A PC-Based Oscilloscope is just like the conventional oscilloscope, but it uses a PC to display the output waveforms.

Why we need a PC-Based Why we need a PC-Based Oscilloscope?Oscilloscope?Data Acquisition method is

inexpensive as compared to the Conventional Oscilloscope.

PC’s are common today.Portable in size.Signals can be stored and

processed later.No need of additional power

supply for PCB.

Steps Involved in the Steps Involved in the Development of the Project?Development of the Project?

Some Important Components Some Important Components (IC’S) used in Designing (IC’S) used in Designing Hardware?Hardware?PIC18F2550 microcontrollerMCP6S91Programmable Gain

AmplifierLF353 Dual Operational AmplifierICL7660 Switched-Capacitor

Voltage Converter4MHz Crystal OscillatorUSB Socket for PCB

Circuit for this ProjectCircuit for this Project Microcontroller

Input Chann

els

Voltage Shifting

Amplifier

PCB Layout of the Circuit:-PCB Layout of the Circuit:-

Short Description onShort Description on PIC18F2550 Microcontroller?PIC18F2550 Microcontroller?

32Kbyte of Flash Memory.

2Kbyte of RAM.256 byte of

EEPROM.USB 2.0 Compliant

Microcontroller.Support Speed from

1.5Mb/s to 12Mb/s.

Short Description of Other Short Description of Other Components UsedComponents UsedMCP6S91

Programmable Gain Amplifier from Microchip Technology.

Used to drive A/D Converter & Analog input of PIC Microcontroller.

It can provide gain from 1:1 to 32:1. It is cheap and easy to use. These amplifier’s accept only positive signals

that’s why a voltage shifting amplifier LF353 are used at each channel.

LF353

This IC has two operational amplifiers.

Op-Amp A is used as “Voltage Shifting Amplifier”.

Op-Amp B is used as “Voltage

Followers”.

Features of LF353:-

JFET Operational Amplifier. Input-Offset is Internally Compensated. Wide Bandwidth. Low Input Bias and Offset Current.

ICL7660

It is a Switched-Capacitor Voltage Converter. It can invert, double, divide and multiply the

+ve i/p signal.

In our project this IC is just use to provide symmetrical

negative supply to PIN-4 of LF353.

Software Used in this Software Used in this Project?Project?“Express PCB” Software for

designing PCB layout.MPLAB IDE along with MPLAB C18

is used for programming the Microcontroller.

The Final Graphical User Interface will be designed in any of the following programming languages:

MATLAB/Visual Studio/Visual Basic.

Further Steps Involved:-Further Steps Involved:-

Step1- Designing PCB, and mounting Components on it.Step2- Interfacing Hardware with PC.Step3- Development of GUI.Step4- Testing and Debugging of Project.

Limitations of this Limitations of this Oscilloscope?Oscilloscope?It can effectively process the

signals up to 10kHz.Input Signals applied must be in

the range of -16V to +16V.

These points must be followed while

operating the device.

Thank You!Thank You!

Any Any Query???Query???