Project 2 - Measuring the distance of an object using ultrasonic sensor and also smoothen the sensor data using moving average filter

SLAVE_CODE

c_cpp

Upload to SLAVE Arduino.

1// Include the required Wire library for I2C
2#include <Wire.h>
3int   LED = 13;
4int x = 0;
5void setup() {
6  // Define the LED pin as Output
7   pinMode (LED, OUTPUT);
8  // Start the I2C Bus as Slave on address 9
9  Wire.begin(9);   
10  // Attach a function to trigger when something is received.
11  Wire.onReceive(receiveEvent);
12}
13void   receiveEvent(int bytes) {
14  x = Wire.read();    // read one character from the   I2C
15}
16void loop() {
17  //If value received is 0 blink LED for 200 ms
18   if (x == 0) {
19    digitalWrite(LED, HIGH);
20    delay(200);
21    digitalWrite(LED,   LOW);
22    delay(200);
23  }
24  //If value received is 3 blink LED for 400   ms
25  if (x == 3) {
26    digitalWrite(LED, HIGH);
27    delay(400);
28    digitalWrite(LED,   LOW);
29    delay(400);
30  }
31}
32

MASTER_CODE

c_cpp

Upload to MASTER Arduino.

1// Include the required Wire library for I2C<br>
2#include<Wire.h>
3int  x = 0;
4void setup() {
5  // Start the I2C Bus as Master
6  Wire.begin();  
7}
8void loop() {
9  Wire.beginTransmission(9); // transmit to device #9
10  Wire.write(x);              // sends x 
11  Wire.endTransmission();    // stop  transmitting
12  x++; // Increment x
13  if (x > 5) x = 0; // `reset x once it  gets 6
14  delay(500);
15}
16

SLAVE_CODE

c_cpp

Upload to SLAVE Arduino.

1// Include the required Wire library for I2C
2#include <Wire.h>
3int  LED = 13;
4int x = 0;
5void setup() {
6  // Define the LED pin as Output
7  pinMode (LED, OUTPUT);
8  // Start the I2C Bus as Slave on address 9
9  Wire.begin(9);  
10  // Attach a function to trigger when something is received.
11  Wire.onReceive(receiveEvent);
12}
13void  receiveEvent(int bytes) {
14  x = Wire.read();    // read one character from the  I2C
15}
16void loop() {
17  //If value received is 0 blink LED for 200 ms
18  if (x == 0) {