Yes an Arduino can be used as Oscilloscope without any additional hardware.
Burn this code to Arduino
const int probePin = A0; void setup() { //Setup serial connection Serial.begin(9600); } void loop() { //Read analog pin int val = analogRead(probePin); //Write analog value to serial port: Serial.write( 0xff ); //can be skipped Serial.write( (val >> 8) & 0xff ); //the higher 8 bits Serial.write( val & 0xff ); //the lower 8 bits }
Download Processing from https://processing.org/download/ This tool will be used to run a C code that will plot the graphs.
Now run this C code in Processing
/* * Oscilloscope * Gives a visual rendering of analog pin 0 in realtime. * * This project is part of Accrochages * See http://accrochages.drone.ws * * (c) 2008 Sofian Audry ([email protected]) * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import processing.serial.*; Serial port; // Create object from Serial class int val; // Data received from the serial port int[] values; float zoom; void setup() { size(1280, 480); // Open the port that the board is connected to and use the same speed (9600 bps) port = new Serial(this, Serial.list()[0], 9600); values = new int[width]; zoom = 1.0f; smooth(); } int getY(int val) { return (int)(height - val / 1023.0f * (height - 1)); } int getValue() { int value = -1; while (port.available() >= 3) { if (port.read() == 0xff) { value = (port.read() << 8) | (port.read()); } } return value; } void pushValue(int value) { for (int i=0; i<width-1; i++) values[i] = values[i+1]; values[width-1] = value; } void drawLines() { stroke(255); int displayWidth = (int) (width / zoom); int k = values.length - displayWidth; int x0 = 0; int y0 = getY(values[k]); for (int i=1; i<displayWidth; i++) { k++; int x1 = (int) (i * (width-1) / (displayWidth-1)); int y1 = getY(values[k]); line(x0, y0, x1, y1); x0 = x1; y0 = y1; } } void drawGrid() { stroke(255, 0, 0); line(0, height/2, width, height/2); } void keyReleased() { switch (key) { case '+': zoom *= 2.0f; println(zoom); if ( (int) (width / zoom) <= 1 ) zoom /= 2.0f; break; case '-': zoom /= 2.0f; if (zoom < 1.0f) zoom *= 2.0f; break; } } void draw() { background(0); drawGrid(); val = getValue(); if (val != -1) { pushValue(val); } drawLines(); }
This is not replacement for an actual oscilloscope. It is a simple one that can used to monitor signal levels and voltages.