Grove OLED 96x96 Slideshow

This project makes use of the Grove OLED 96x96 display to present a mini-slideshow.  Pictures on your computer are transferred to the OLED via a Processing script, and will cycle through them as many times as you choose.

Video:

Parts required:

• Arduino UNO or compatible board such as the Freetronics Eleven
• Seeed Studio's Grove OLED display 96x96
• Seeed Studio's Grove Base Shield
• Seeed Studio's Grove Universal Cables

Software required:

• Arduino IDE version 023 - later versions are NOT supported (at the time of this writing)
• Processing IDE
• Seeed Studio's Gray OLED Library - unzip these files and copy them into the Arduino Library folder

Sketch:

Arduino Sketch:

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// OLED Slideshow: Arduino Sketch written by ScottC 21/07/2012 #include <Wire.h> #include <SeeedGrayOLED.h> //From http://garden.seeedstudio.com/images/c/c4/SeeedGrayOLED.zip #include <avr/pgmspace.h> int counter=0; void setup() { //Allow communication to OLED Wire.begin(); //Allow Serial communication between Freetronics Eleven and Computer Serial.begin(28800); //Initialise the OLED SeeedGrayOled.init(); //Clear the OLED display SeeedGrayOled.clearDisplay(); //Set to vertical mode - horizontal mode doesn't work with this example SeeedGrayOled.setVerticalMode(); } void loop(){ //Listen for Serial comunication while (Serial.available()>0) { // Read data and send directly to the OLED sendMyData(Serial.read()); counter++; //When counter reaches 4608 pixels, the picture is complete. if(counter>4607){ //Insert delay to allow viewing of picture. delay(4000); Serial.println("End of Transmission"); //Reset the counter for the next picture counter=0; } } } // This function was adapted from the SEEED Gray OLED driver so that // character bytes could be sent directly to the OLED. void sendMyData(unsigned char Data){ Wire.beginTransmission(SeeedGrayOLED_Address); // begin I2C transmission Wire.send(SeeedGrayOLED_Data_Mode); // data mode Wire.send(Data); Wire.endTransmission(); } // This function was adapted from the SEEED Gray OLED driver so that // commands could be sent directly to the OLED. // NOT USED IN THIS EXAMPLE *********************** void sendMyCommand(unsigned char Cmd){ Wire.beginTransmission(SeeedGrayOLED_Address); // begin I2C communication Wire.send(SeeedGrayOLED_Command_Mode); // Set OLED Command mode Wire.send(Cmd); Wire.endTransmission(); // End I2C communication }

Processing Sketch:

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/* OLED Slideshow: Processing Sketch Written by ScottC 21/7/2012 References: Getting Pixels: http://www.learningprocessing.com/examples/chapter-15/example-15-7/ Greyscale conversion = http://www.openprocessing.org/sketch/60336 */ import processing.serial.*; /* Needed for Serial Communication */ /* Global variables */ Serial comPort; String [] comPortList; String comPortString; PImage img; char[] tempGrey=new char[4609]; int startOffset=0; ArrayList picNames; int curLoop=1; int totalPics=0; int curPicNum=0; boolean toggleSend=true; boolean sendBouncer=true; //Change maxLoops to a number > 1 if you want the pictures to loop. int maxLoops=1; void setup() { //The size of the display is critical (must match the OLED) size(96, 96); //setup Serial comPortList = Serial.list(); if(comPortList.length>0){ //baud rates greater than 28800 may produce unexpected results comPort = new Serial(this, comPortList[0], 28800); comPort.bufferUntil('\n'); } else{ println("NO COM PORTS AVAILABLE"); } //Create an Array of pictures picNames=new ArrayList(); picNames.add("Picture1.bmp"); picNames.add("Picture2.bmp"); picNames.add("Picture3.bmp"); picNames.add("Picture4.bmp"); // for more pictures just keep adding them to the list. //The actual pictures must be located in the data folder of this project. //Select Sketch/Add File to add the files to this folder. //Make sure that the name of pictures match the names above. //Get the total number of pictures added totalPics=picNames.size(); } void draw(){ if(toggleSend && sendBouncer){ // Debugging code: print("STARTED:"); // Debugging code: println(picNames.get(curPicNum)); sendImage((String)picNames.get(curPicNum)); //Send the picture to the OLED toggleSend=false; //temporarily stop sending any more pictures until authorised curPicNum++; //increment in preparation for the next picture if(curPicNum==totalPics){ curPicNum=0; //go back to the first picture curLoop++; //increment the loop counter } if(curLoop>maxLoops){ sendBouncer=false; //Stop any further looping println("ANIMATION COMPLETE"); } } } void sendImage(String imgName){ img = loadImage(imgName); image(img,0,0,width,height); loadPixels(); int counter=0; for (int x = 0; x < width; x=x+2) { for (int y = 0; y < height; y++) { counter++; int PixLoc = x + y*height; // this reads down then across2. //Left pixel nibble int Pix1=(round((red(pixels[PixLoc])*0.222+green(pixels[PixLoc])*0.707+blue(pixels[PixLoc])*0.071)))/16; //Right pixel nibble int Pix2=(round((red(pixels[PixLoc+1])*0.222+green(pixels[PixLoc+1])*0.707+blue(pixels[PixLoc+1])*0.071)))/16; //Shift the byte <<4 for the left pixel nibble int PixShift1=Pix1<<4; //Combine both nibbles to form a byte int PixFin = PixShift1+Pix2; byte PixByteFin=byte(PixFin); //Assign this byte to the tempGrey array tempGrey[counter] = char(PixByteFin); } } sendSerial(tempGrey); //Send the image data through the Serial COM Port/ } //This function will send the byte/Char array to the Freetronics //Eleven or Arduino. void sendSerial(char[] Data){ for(int i=0; i<4608; i++){ //Needs an offset to get picture to align to screen properly //only needs to do this once. if(startOffset==0){ i=i+6; startOffset++; } //Send the picture data to the Freetronics Eleven / Arduino comPort.write(Data[i]); } } //This function will wait for a response from the Freetronics //Eleven or Arduino before sending any further pictures. void serialEvent (Serial myPort) { // get the ASCII string: String inString = myPort.readStringUntil('\n'); if (inString != null) { println(inString); toggleSend=true; // Allow the next picture to be sent } }

Please note: that you must use the Arduino IDE version 023 until Seeed Studio update their driver for this OLED. Their current driver is not compatible with later versions of Arduino IDE.