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  • GerardoM21 commented on Gursimran Singh 425's instructable DIY Color Sensor10 months ago
    DIY Color Sensor

    // Define colour sensor LED pinsint ledArray[] = {2,3,4};// boolean to know if the balance has been set boolean balanceSet = false;//place holders for colour detected int red = 0; int green = 0;int blue = 0;//floats to hold colour arrays float colourArray[] = {0,0,0}; float whiteArray[] = {0,0,0}; float blackArray[] = {0,0,0};//place holder for average int avgRead;void setup(){ //setup the outputs for the colour sensor pinMode(2,OUTPUT); pinMode(3,OUTPUT); pinMode(4,OUTPUT); //begin serial communication Serial.begin(9600); }void loop(){checkBalance(); checkColour(); printColour(); }void checkBalance(){ //check if the balance has been set, if not, set it if(balanceSet == false){ setBalance(); } }void setBalance(){ //set white balance delay(5000); //delay for five seconds, this gives us t...see more »// Define colour sensor LED pinsint ledArray[] = {2,3,4};// boolean to know if the balance has been set boolean balanceSet = false;//place holders for colour detected int red = 0; int green = 0;int blue = 0;//floats to hold colour arrays float colourArray[] = {0,0,0}; float whiteArray[] = {0,0,0}; float blackArray[] = {0,0,0};//place holder for average int avgRead;void setup(){ //setup the outputs for the colour sensor pinMode(2,OUTPUT); pinMode(3,OUTPUT); pinMode(4,OUTPUT); //begin serial communication Serial.begin(9600); }void loop(){checkBalance(); checkColour(); printColour(); }void checkBalance(){ //check if the balance has been set, if not, set it if(balanceSet == false){ setBalance(); } }void setBalance(){ //set white balance delay(5000); //delay for five seconds, this gives us time to get a white sample in front of our sensor //scan the white sample. //go through each light, get a reading, set the base reading for each colour red, green, and blue to the white array for(int i = 0;i<=2;i++){ digitalWrite(ledArray[i],HIGH); delay(100); getReading(5); //number is the number of scans to take for average, this whole function is redundant, one reading works just as well. whiteArray[i] = avgRead; digitalWrite(ledArray[i],LOW); delay(100); } //done scanning white, now it will pulse blue to tell you that it is time for the black (or grey) sample. //set black balance delay(5000); //wait for five seconds so we can position our black sample //go ahead and scan, sets the colour values for red, green, and blue when exposed to black for(int i = 0;i<=2;i++){ digitalWrite(ledArray[i],HIGH); delay(100); getReading(5); blackArray[i] = avgRead; //blackArray[i] = analogRead(2); digitalWrite(ledArray[i],LOW); delay(100); } //set boolean value so we know that balance is set balanceSet = true; //delay another 5 seconds to allow the human to catch up to what is going on delay(5000); }void checkColour(){ for(int i = 0;i<=2;i++){ digitalWrite(ledArray[i],HIGH); //turn or the LED, red, green or blue depending which iteration delay(100); //delay to allow CdS to stabalize, they are slow getReading(5); //take a reading however many times colourArray[i] = avgRead; //set the current colour in the array to the average reading float greyDiff = whiteArray[i] - blackArray[i]; //the highest possible return minus the lowest returns the area for values in between colourArray[i] = (colourArray[i] - blackArray[i])/(greyDiff)*255; //the reading returned minus the lowest value divided by the possible range multiplied by 255 will give us a value roughly between 0-255 representing the value for the current reflectivity(for the colour it is exposed to) of what is being scanned digitalWrite(ledArray[i],LOW); //turn off the current LED delay(100); } } void getReading(int times){ int reading; int tally=0; //take the reading however many times was requested and add them up for(int i = 0;i < times;i++){ reading = analogRead(0); tally = reading + tally; delay(10); } //calculate the average and set it avgRead = (tally)/times; }//prints the colour in the colour array, in the next step, we will send this to processing to see how good the sensor works. void printColour(){ Serial.print("R = "); Serial.println(int(colourArray[0])); Serial.print("G = "); Serial.println(int(colourArray[1])); Serial.print("B = "); Serial.println(int(colourArray[2])); delay(2000); }

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