Week 15
Networking and Communications
The objective :
The assignment for this week is to design and build a wired or wireless network connecting at least two nodes For this week's , I decided to build a wired serial network using hello.bridge board and two boards of LED.
Tools :
|
|
Name |
Uses |
|
1 |
Arduino (software) |
Programing |
|
2 |
Eagle (software) |
Designing |
|
3 |
PCB copper clad board |
Board Mterial |
|
4 |
Hakko-936 |
Soldering Machine |
|
5 |
UT39A |
Digital Multimeter |
|
6 |
Cirqoid |
milling machine |
WORK FLOW
1.Boards preparation:
I used Eagle for redesigning the board As I Did in previous weeks. The designing as process became easier than before But much complicated with this amount of elements and boards. I did the design several times this week due many reason such as shorted circuits.
A. Master Board :
B. Slave Board :
➔The final design that I used for the output (.brd,sch) .
C. PCB Milling & Soldering:
After boards designing has been completed I started milling the PCB and soldering the components as shown below.
My master board and 2 slave boards after milling and soldering
D.Programing:
1.For the master board I use the following code:
#include <Wire.h>
void setup()
{
Wire.begin(); // join i2c bus (address optional for master)
}
byte x = 0;
byte x1 = 0;
void loop() {
Wire.beginTransmission(0x1);
Wire.write(++x % 2);
Wire.endTransmission();
delay(5000);
Wire.beginTransmission(0x2);
Wire.write(++x1 % 2);
Wire.endTransmission();
delay(5000);
}
2.For the slave board 1 I used this code :
#define output(directions, pin) (directions |= (1 << pin)) // set port direction for output
#define input(directions, pin) (directions &= (~(1 << pin))) // set port direction for input
#define set(port, pin) (port |= (1 << pin)) // set port pin
#define clear(port, pin) (port &= (~(1 << pin))) // clear port pin
#define LED_PIN PB4
#define I2C_SLAVE_ADDRESS 0x1 // Address of the slave 1
#include <TinyWireS.h>
void setup()
{
output(DDRB, LED_PIN);
clear(PORTB, LED_PIN);
TinyWireS.begin(I2C_SLAVE_ADDRESS); // join i2c network
}
void loop()
{
byte recd = 1;
if(TinyWireS.available()) {
recd = TinyWireS.receive();
if(recd == 1) {
clear(PORTB, LED_PIN);
} else {
set(PORTB, LED_PIN);
}
}
}
3.For the slave board 2 I used the same code but I defined different address:
#define output(directions, pin) (directions |= (1 << pin)) // set port direction for output
#define input(directions, pin) (directions &= (~(1 << pin))) // set port direction for input
#define set(port, pin) (port |= (1 << pin)) // set port pin
#define clear(port, pin) (port &= (~(1 << pin))) // clear port pin
#define LED_PIN PB4
#define I2C_SLAVE_ADDRESS 0x2 // Address of the slave 2
#include <TinyWireS.h>
void setup()
{
output(DDRB, LED_PIN);
clear(PORTB, LED_PIN);
TinyWireS.begin(I2C_SLAVE_ADDRESS); // join i2c network
}
void loop()
{
byte recd = 1;
if(TinyWireS.available()) {
recd = TinyWireS.receive();
if(recd == 1) {
clear(PORTB, LED_PIN);
} else {
set(PORTB, LED_PIN);
}
}
}
5.Networking :
After programing the master and salve boards I connected them as shown in video below and worked perfectly :