Hi guys,
Today I’ll talk about a really good project you can do with your Arduino! This is the best way you can have a cheap oscilloscope around. Let’s start…
- First, download processing. It’s free Click here to download. You don’t need to install anything, It runs like the Arduino IDE.
- Now upload this code into your Arduino
- After Run this code in Processing IDE
And then you just need to connect the Arduino analog pin 0 to the signal you want to read.
And It’s done!
This is the Circuit I’ll be measuring , it’s a simple 555 timer circuit… that flashes a LED, parts list:
- 1x Arduino
555 Timer LED Blinks
- 1x Breadboard
- 1x LED
- 1x 10k resistor
- 1×4.7k resistor
- 1x 1k resistor
- 1x 100nF electrolytic capacitor
- Jumper cables
Check my YouTube video and watch it working.
Thanks for reading, leave a comment or send me an email. If you like this post probably you might like my next ones, so please support me by subscribing my blog and my Facebook page (you can find everything right column )
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I like it.
Thanks 🙂
What is the Scope time base setting?
actually there’s no windows where you can change the time base, you can do that by changing the code a bit probably
I tried it but the screen is blank..do I need to make a special probe..please let me know..thanks
please use my new website… randomnerdtutorials.com
you don’t need any special probes, that should be working right away? are you using windows?
download the 32 bits version of processing and try again..
Yes I am on windows vista /7 ..I only get a red line in the middle..when I feed in a signal there is no effect..I’m using arduino dumeilenova 328..please help…
I had to change:
port = new Serial(this, Serial.list()[0], 9600);
to:
port = new Serial(this, Serial.list()[4], 9600);
Try a different port # or add: println(Serial.list()); to setup() to display your serial ports. Make sure you use the same number that you use in Arduino->Tools->Serial Port
Complete Processing Code:
/*
* 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 (info@sofianaudry.com)
*
* 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 .
*/
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);
println(Serial.list());
// You may need to change the number in [ ] to match the correct port for your system
// Look at the output in the bottom of this window
// Open the port that the board is connected to and use the same speed (9600 bps)
port = new Serial(this, Serial.list()[4], 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();
}