NodeMCU-ColorSensor-ThingSpeak

Color Sensor

Sensor Connection-

LHS pins are of the NodeMCU, and RHS pins are of the color sensor

NodeMCU pins—->color sensor pins

D4—>S0
D5—>S1
D6—>S2
D7—>S3
GND—>OE
D8—>OUT
3.3V—>VCC
GND—>GND

Arduino code for sensor-

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const int s0 = D4;

const int s1 = D5;

const int s2 = D6;

const int s3 = D7;

const int out = D8;

int red = 0;

int green = 0;

int blue = 0;

void setup()

{

Serial.begin(9600);

pinMode(s0, OUTPUT);

pinMode(s1, OUTPUT);

pinMode(s2, OUTPUT);

pinMode(s3, OUTPUT);

pinMode(out, INPUT);

digitalWrite(s0, HIGH);

digitalWrite(s1, HIGH);

}

void loop()

{

color();

Serial.print(“R Intensity:”);

Serial.print(red, DEC);

Serial.print(” G Intensity: “);

Serial.print(green, DEC);

Serial.print(” B Intensity : “);

Serial.print(blue, DEC);

if (red < blue && red < green && red < 20)

{

Serial.println(” – (Red Color)”);

}

else if (blue < red && blue < green)

{

Serial.println(” – (Blue Color)”);

}

else if (green < red && green < blue)

{

Serial.println(” – (Green Color)”);

}

else

{

Serial.println();

}

delay(1000);

}

void color()

{

digitalWrite(s2, LOW);

digitalWrite(s3, LOW);

red = pulseIn(out, digitalRead(out) == HIGH ? LOW : HIGH);

digitalWrite(s3, HIGH);

blue = pulseIn(out, digitalRead(out) == HIGH ? LOW : HIGH);

digitalWrite(s2, HIGH);

green = pulseIn(out, digitalRead(out) == HIGH ? LOW : HIGH);

}

Parag Achaliya