5/19/2018 OSCILLOSCOPE using Arduino - UNO

1/4

OSCILLOSCOPE USING MICROCONTROLLER

ABSTRACT: The general cathode-ray oscilloscope (CRO) is a common laboratory

instrument that provides accurate time and amplitude measurements of voltage

signals over a wide range of frequencies. Its reliability, stability, and ease of

operation make it suitable as a general purpose laboratory instrument. In this project

an oscilloscope is made with the help of an micontroller (ARDUINO-UNO) through a

software hardware interface. The main principle involved is real time plotting of the

data that is the data is serially transmitted and serial received at any particular

instance of time from the microcontroller.

SETUP:

Initially the microcontroller is connected to the laptop console with a respected COM

specified, for example com35 through which the serial data is send and received.

The microcontroller is programmed to receive the serial data and to send the serial

data .The programming of the microcontroller is done in ARDUINO-IDE(integrated

development environment and which is dumped into the microcontroller through

USB cable to the specified COM port. Here the ARDUINO ide is interfaced with the

SIMPLOT to plot the received signal . The interfacing is done with the programming

the ARDUINO IDE.

5/19/2018 OSCILLOSCOPE using Arduino - UNO

2/4

BLOCK DIAGRAM:

The block diagram of the arrangement is as shown below the analog signal is given

to the microcontroller(ARDUINO-UNO), through which the analog signal is serially

received from the simplot and plot is potted according to the analog signal in real

time.

OPERATION:

When the input is given to the analog input of the ARDUINO the data is send serially

from respective port and it is send to the ARDUINO through which the input is fed to

the Simplot and required wave form is plotted there.

5/19/2018 OSCILLOSCOPE using Arduino - UNO

3/4

Operation inside the ARDUINO:

When the analog signal is given to the analog pin of the ARDUINO-UNO , the analog

signal is converted into digital data ie the data is sampled ,here the sampling rate is

1024 bits per cycle ,i.e each cycle in the analog signal is sampled into 1024 bits and

coded the digitally coded data is send to the ARDUINO IDE where the received

coded information is decode that is the data is again converted into analog data

through analog to digital converter(A/D converter).The analog data at that particular

point of time can be obtained from the serial monitor which is available at the

ARDUINO-IDE.

Operation of the Simplot:

Simplot open system environment software which plots the serially received date

that is received from the specified ports that are specified in the ARDUINO IDE. The

advantage here over the normal oscilloscope with respect to the used here is ,it can

be operated in simultaneously four channels. The required settings of the plot can

be made by provided settings that are given by the vendor in the software , different

such settings available are adjustment of baud rate ,etc.

Initial arrangements:

As the used microcontroller(ARDUINO-UNO) has the amplitude of only 5volts hence

the initially the circuit is scaled in such a way that to produce a plot of 24volts, the

circuit arrangement is as shown in the below figure

5/19/2018 OSCILLOSCOPE using Arduino - UNO

4/4

For scaling of the circuit of the input the first the input is signal is clamped to the

required level, and the signal is passed through the negative inverting amplifier, and

thus required scaling of the signal is achieved here the scaling is done to +12v to-

12v.

RESULT:

The analog signals are plotted in the laptop that is in SIMPLOT by using the

microcontroller (ARDUINO-UNO) by real time plotting simultaneously in four

channels are shown below.