Week 14 : Networking and Communications
This weeks group assignment is to send messages between two projects.
We conducted an i2c communication between an Input Board with ultrasonic sensor made by Anooj during his Input week and an output Board with RGB Led made by Eldho during his Output week.
Master Node
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Slave Node
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Program 1
We made a master program to find presence within 10cm, 20cm and 30cm and a slave program to change the led colour depending on the distance.
Master Program
#include <Wire.h>
#include <SoftwareSerial.h>
#define trigPin 3
#define echoPin 2
#define RX 1
#define TX 0
SoftwareSerial window(RX, TX);
void setup()
{
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
window.begin(9600);
Wire.begin();
}
void loop()
{
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if(distance <= 10)
{
Wire.beginTransmission(8);
Wire.write(0);
Wire.endTransmission();
window.println("Human within 10cm");
}
else if(distance > 10 && distance <=20)
{
Wire.beginTransmission(8);
Wire.write(1);
Wire.endTransmission();
window.println("Human within 20cm");
}
else if(distance > 20 && distance <=30)
{
Wire.beginTransmission(8);
Wire.write(2);
Wire.endTransmission();
window.println("Human within 30cm");
}
delay(1000);
}
Slave Program
#include <Wire.h>
#define led1 2
#define led2 3
#define led3 1
void setup()
{
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
Wire.begin(8);
Wire.onReceive(receiveEvent);
}
void loop()
{
delay(1000);
}
void receiveEvent()
{
int x = Wire.read();
if (x == 0)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, LOW);
digitalWrite(led3, HIGH);
}
else if (x == 1)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
}
else if (x == 2)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, HIGH);
digitalWrite(led3, LOW);
}
}
We then flashed the programs to the respective boards and then completed the i2c connection.
Program 2
We made a similar program but this time added more colors.
Master Program
#include <Wire.h>
#include <SoftwareSerial.h>
#define trigPin 3
#define echoPin 2
#define RX 1
#define TX 0
SoftwareSerial window(RX, TX);
void setup()
{
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
window.begin(9600);
Wire.begin();
}
void loop()
{
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if(distance <= 2)
{
Wire.beginTransmission(8);
Wire.write(0);
Wire.endTransmission();
window.println("Human within 2cm");
}
else if(distance > 2 && distance <=4)
{
Wire.beginTransmission(8);
Wire.write(1);
Wire.endTransmission();
window.println("Human within 4cm");
}
else if(distance > 4 && distance <=6)
{
Wire.beginTransmission(8);
Wire.write(2);
Wire.endTransmission();
window.println("Human within 6cm");
}
else if(distance > 6 && distance <=8)
{
Wire.beginTransmission(8);
Wire.write(3);
Wire.endTransmission();
window.println("Human within 8cm");
}
else if(distance > 8 && distance <=10)
{
Wire.beginTransmission(8);
Wire.write(4);
Wire.endTransmission();
window.println("Human within 10cm");
}
else if(distance > 10 && distance <=12)
{
Wire.beginTransmission(8);
Wire.write(5);
Wire.endTransmission();
window.println("Human within 12cm");
}
else if(distance > 12 && distance <=14)
{
Wire.beginTransmission(8);
Wire.write(6);
Wire.endTransmission();
window.println("Human within 14cm");
}
else if(distance > 14 && distance <=16)
{
Wire.beginTransmission(8);
Wire.write(7);
Wire.endTransmission();
window.println("Human within 16cm");
}
else if(distance > 16 && distance <=18)
{
Wire.beginTransmission(8);
Wire.write(8);
Wire.endTransmission();
window.println("Human within 18cm");
}
else if(distance > 18 && distance <=20)
{
Wire.beginTransmission(8);
Wire.write(9);
Wire.endTransmission();
window.println("Human within 20cm");
}
else if(distance > 20 && distance <=22)
{
Wire.beginTransmission(8);
Wire.write(10);
Wire.endTransmission();
window.println("Human within 22cm");
}
else if(distance > 22 && distance <=24)
{
Wire.beginTransmission(8);
Wire.write(11);
Wire.endTransmission();
window.println("Human within 24cm");
}
else if(distance > 24 && distance <=26)
{
Wire.beginTransmission(8);
Wire.write(12);
Wire.endTransmission();
window.println("Human within 26cm");
}
else if(distance > 26 && distance <=28)
{
Wire.beginTransmission(8);
Wire.write(13);
Wire.endTransmission();
window.println("Human within 28cm");
}
delay(100);
}
Slave Program
#include <Wire.h>
#define led1 2
#define led2 3
#define led3 1
void setup()
{
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
Wire.begin(8);
Wire.onReceive(receiveEvent);
}
void loop()
{
delay(1000);
}
void receiveEvent()
{
int x = Wire.read();
if (x == 0)
{
RGB_color(255,0, 0); // Red
}
else if (x == 1)
{
RGB_color(0,255, 0); // Green
}
else if (x == 2)
{
RGB_color(0, 0,255); // Blue
}
else if (x == 3)
{
RGB_color(255, 147, 41); // Candle
}
else if (x == 4)
{
RGB_color(201, 226, 255); // overcast sky
}
else if (x == 5)
{
RGB_color(64, 156, 255); // clear blue sky
}
else if (x == 6)
{
RGB_color(244, 255, 250); // standard fluorecent
}
else if (x == 7)
{
RGB_color(255, 239, 247); // grow light fluorescent
}
else if (x == 8)
{
RGB_color(167,0,255); // black light fluorecent
}
else if (x == 9)
{
RGB_color(0, 255, 255); // Cyan
}
else if (x == 10)
{
RGB_color(255, 0, 255); // Magenta
}
else if (x == 11)
{
RGB_color(255, 255, 0); // Yellow
}
else if (x == 12)
{
RGB_color(255, 255, 255); // White
}
else if (x == 13)
{
RGB_color(0, 0, 0); // White
}
}
void RGB_color(int red_light_value, int green_light_value, int blue_light_value)
{
analogWrite(led2, 255-red_light_value);
analogWrite(led3, 255-green_light_value);
analogWrite(led1,255-blue_light_value);
}
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