Arduino Interfacing with Color sensor diagram,working,code
This app note covers Arduino Interfacing with Color sensor diagram and its working. It describes Color sensor used and mentions arduino code.
About Color sensor
The color sensor is used to detect RGB coordinates of a color. The color sensor works by emitting a white light on object and recording reflected light using photodiode. Using color filters, photodiode converts amount of light to current.
We will use TCS3200 color sensor for interfacing with arduino uno board for our explaination. The IC TCS3200 consists of current to frequency converter.
These RGB values are processed to find exact color combination. Refer advantages and disadvantages of color sensor for more information.
Following are the pin designations of a color sensor.
GND - Power supply ground
OE - Enable for output frequency (active low)
OUT - Output frequency
S0, S1 - Output frequency scaling selection inputs
S2, S3 - Photodiode type selection inputs
VDD - Voltage Supply
To select color read by photodiode, one can use control pins S2/S3 combination.
S2/S3 -> Low/Low selects Red filter
S2/S3 -> Low/High selects Blue filter
S2/S3 -> High/High selects Green filter
S2/S3 -> High/Low refers to no filter
About Arduino board
• Arduino Uno houses ATmega328 microcontroller from ATMEL. This microcontroller contains flash memory (32 KB), RAM (2 KB), 8 bit wide CPU and 1 KB EEPROM.
• It also supports 6 analog pins which reads voltage and not current. Inside, it converts analog measurement to digital for various purposes.
It supports digital pins (0 to 13) which can function either as input or output.
• It has various interfaces viz. I2C, digital pins, analog pins, serial communication, USB etc.
• It also has reset pin, power port, crystal oscillator and Tx/Rx LEDs.
• This open source prototype board can be easily programmed using easy to use arduino IDE and USB interfaced between
laptop PC and arduino board.
• IDE uses simplified C++ program.
• Board requires 5V DC which can be powered using AC/DC adapter or battery.
Arduino Interfacing with Color sensor diagram and its working
The figure depicts interfacing of color sensor with arduino uno board.
Both arduino and color sensor are interfaced as per following table.
| Color sensor TCS3200 | Arduino board |
|---|---|
| S0 | Pin 4 |
| S1 | Pin 5 |
| Vcc | +5V |
| S2 | Pin 7 |
| S3 | Pin 6 |
| OUT | Pin 8 |
| GND | GND |
Arduino Color sensor interface code
Following is the arduino code compiled and uploaded to the arduino board using Arduino IDE.
#define S0 4
#define S1 5
#define S2 6
#define S3 7
#define sensorOut 8
// frequency read by the photo-diodes are stored in following variables
int redFrequency = 0;
int greenFrequency = 0;
int blueFrequency = 0;
void setup() {
pinMode(S0, OUTPUT);
pinMode(S1, OUTPUT);
pinMode(S2, OUTPUT);
pinMode(S3, OUTPUT);
pinMode(sensorOut, INPUT);
digitalWrite(S0,HIGH);
digitalWrite(S1,LOW);
Serial.begin(9600);
}
void loop() {
digitalWrite(S2,LOW);
digitalWrite(S3,LOW);
// Reading the output frequency
redFrequency = pulseIn(sensorOut, LOW);
Serial.print("R = ");
Serial.print(redFrequency);
delay(100);
digitalWrite(S2,HIGH);
digitalWrite(S3,HIGH);
// Reading the output frequency
greenFrequency = pulseIn(sensorOut, LOW);
Serial.print(" G = ");
Serial.print(greenFrequency);
delay(100);
// Setting BLUE (B) filtered photodiodes to be read
digitalWrite(S2,LOW);
digitalWrite(S3,HIGH);
blueFrequency = pulseIn(sensorOut, LOW);
Serial.print(" B = ");
Serial.println(blueFrequency);
delay(100);v }
if (mqtt.connected())
{
colour_value.publish(Red_value);
colour_value.publish(Green_value);
colour_value.publish(Blue_value);
}
Conclusion: In this application note we have seen Color sensor interfacing with Arduino Uno board. Arduino board is also used for interfacing different types of sensors for applications. The typical sensors interfaced with arduino are sound sensor, gyro sensor, LDR sensor, GPS sensor, heartbeat sensor, pH sensor etc.
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