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<\/p>\nToday 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, I didn’t write this code, I’ve found it on the internet\u00a0a while back ago and I’ve decided to share this awesome project.\u00a0Let’s start…<\/p>\n
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First, download Processing. It’s free\u00a0Click here to download<\/a>. You don’t need to install anything, It runs like the Arduino IDE.<\/p>\n View raw code<\/a><\/p>\n View raw code<\/a><\/p>\n And then you just need to connect the Arduino analog pin 0 to the signal you want to read.<\/p>\n And It’s done!<\/p>\n This is the circuit I’ll be measuring , it’s a simple 555 timer circuit… that flashes an LED.<\/p>\nUpload this code to\u00a0your Arduino<\/h2>\n
\/* \n Complete project details: http:\/\/randomnerdtutorials.com\/arduino-poor-mans-oscilloscope\/\n*\/\n\n#define ANALOG_IN 0\n \nvoid setup() {\n Serial.begin(9600); \n \/\/Serial.begin(115200); \n}\n \nvoid loop() {\n int val = analogRead(ANALOG_IN); \n Serial.write( 0xff ); \n Serial.write( (val >> 8) & 0xff ); \n Serial.write( val & 0xff );\n}\n<\/code><\/pre>\n\tThen Run this code in Processing IDE<\/h2>\n
\/*\n * Oscilloscope\n * Gives a visual rendering of analog pin 0 in realtime.\n * \n * This project is part of Accrochages\n * See http:\/\/accrochages.drone.ws\n * \n * (c) 2008 Sofian Audry (info@sofianaudry.com)\n *\n * This program is free software: you can redistribute it and\/or modify\n * it under the terms of the GNU General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n * \n * This program is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n * GNU General Public License for more details.\n * \n * You should have received a copy of the GNU General Public License\n * along with this program. If not, see <http:\/\/www.gnu.org\/licenses\/>.\n *\/ \nimport processing.serial.*;\n \nSerial port; \/\/ Create object from Serial class\nint val; \/\/ Data received from the serial port\nint[] values;\nfloat zoom;\n \nvoid setup() \n{\n size(1280, 480);\n \/\/ Open the port that the board is connected to and use the same speed (9600 bps)\n port = new Serial(this, Serial.list()[0], 9600);\n values = new int[width];\n zoom = 1.0f;\n smooth();\n}\n \nint getY(int val) {\n return (int)(height - val \/ 1023.0f * (height - 1));\n}\n \nint getValue() {\n int value = -1;\n while (port.available() >= 3) {\n if (port.read() == 0xff) {\n value = (port.read() << 8) | (port.read());\n }\n }\n return value;\n}\n \nvoid pushValue(int value) {\n for (int i=0; i<width-1; i++)\n values[i] = values[i+1];\n values[width-1] = value;\n}\n \nvoid drawLines() {\n stroke(255);\n \n int displayWidth = (int) (width \/ zoom);\n \n int k = values.length - displayWidth;\n \n int x0 = 0;\n int y0 = getY(values[k]);\n for (int i=1; i<displayWidth; i++) {\n k++;\n int x1 = (int) (i * (width-1) \/ (displayWidth-1));\n int y1 = getY(values[k]);\n line(x0, y0, x1, y1);\n x0 = x1;\n y0 = y1;\n }\n}\n \nvoid drawGrid() {\n stroke(255, 0, 0);\n line(0, height\/2, width, height\/2);\n}\n \nvoid keyReleased() {\n switch (key) {\n case '+':\n zoom *= 2.0f;\n println(zoom);\n if ( (int) (width \/ zoom) <= 1 )\n zoom \/= 2.0f;\n break;\n case '-':\n zoom \/= 2.0f;\n if (zoom < 1.0f)\n zoom *= 2.0f;\n break;\n }\n}\n \nvoid draw()\n{\n background(0);\n drawGrid();\n val = getValue();\n if (val != -1) {\n pushValue(val);\n }\n drawLines();\n}\n<\/code><\/pre>\n\tParts required<\/h2>\n
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Schematics<\/h2>\n
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