FAB Academy2018

Networking and Communications

Tasks:

- Design and build a wired and/or wireless network connecting at least two processors
- Implement and interpret networking protocols

To be honest, I had no previous background around Networking. So I had to start from the very beginning and understand

For this assigment I will be using two boards which I made during the Electronic design week
Echo hello-world board and Arduino ATMEGA 328 .

Serial Communication

For this week I am using the Sofrware Serial library in Arduino. That allows for communication between the boards.
A serial bus consists of just two wires - one for sending data and another for receiving. As such, serial devices
should have two serial pins: the receiver, RX, and the transmitter,TX.

The problem is in echo-hello board dose not have the serial communication hardware,
In ATMEGA 328 we have serial communication hardware and software.

But unfortunately
In my board I broke the RX pin while I`m soldering the chip.

To Solve this problem :

First I used echo-hello borad as a master to program the Arduino board. I used software seial library.

This is the code which I use for echo-hello board.

     
     
     #include <SoftwareSerial.h>
SoftwareSerial A44 (0,1);  //RX and TX pins
void setup() {
  // put your setup code here, to run once:
A44.begin(9600); //start the software serial at 9600
}

void loop() {
A44.println(1);
delay (5000); 

       }

Then to solve the problem of the RX pin in the Arduino board,I define it using software serial on a a general purpose input/output pin.

This is the code which I use for the Arduino board.

     
      #include <SoftwareSerial.h> //include library

SoftwareSerial shmj(6,7);  //RX and TX pins
 int x = 10;
void setup() {
  // put your setup code here, to run once:
shmj .begin(9600);//start the software serial at 9600
pinMode (x,1); // led pin is output 
}

void loop() {
  // put your main code here, to run repeatedly:
if (shmj.available ()>0) {
   digitalWrite(x , HIGH);
  delay(1000);
  digitalWrite(x , LOW);
  delay(1000);
}
 
}

After I upload the code to the master and slave board, I made the connection between them.
This video shows that the LED in Arduino board will blink when it receives the message from the echo-hello board.

ESP8266 WiFi

Design a WiFi board based on the design available on the FabAcademy website.

I used ESP8266_07 WiFi module. Chip pinout shown below.
For more detiales about connections, modes and at command read THIS DATASHEET

This my schematic design:

Components:

ESP 07 module
3.3V voltage regulator
6 Pin headers (RX,TX,GND and VCC)
Capacitor 1 uF
Capacitor 10 uF

This my board :

This is how it looks after I soldered everything:

To test the wifi module, I connect it to my computer using the 3.3V FTDI cable.

3.3V FTDI cable connects to the GND and VCC of the board
FTDI cable TX ----------> ESP8266 board RX
FTDI cable RX ----------> ESP8266 board TX

To program the board I used the AT commands. And this tutorial helps me to program it

The LOG of the commands that I used:

 
AT


OK
AT+CWLAP

+CWLAP:(0,"ZAIN-ZINC",-73,"70:3a:0e:d9:04:80",1,-7,0)
+CWLAP:(3,"Luminus Incepto",-76,"d4:2c:44:dd:4b:a0",6,0,0)
+CWLAP:(3,"Luminus_Guests",-77,"94:d4:69:f5:14:61",6,1,0)
+CWLAP:(3,"QUDS_LC",-77,"d4:2c:44:dd:3f:60",6,-9,0)
+CWLAP:(3,"Luminus Incepto",-73,"d4:2c:44:dd:54:e0",11,1,0)
+CWLAP:(3,"Luminus_Guests",-77,"d4:2c:44:dd:54:e1",11,1,0)
+CWLAP:(0,"ZAIN-ZINC",-77,"70:3a:0e:d9:0d:e0",11,-12,0)

OK
AT+CWJAP="Luminus Incepto","49380761"

WIFI CONNECTED
WIFI GOT IP

OK
AT+CIPSTA?

+CIPSTA:ip:"192.168.9.197"
+CIPSTA:gateway:"192.168.9.2"
+CIPSTA:netmask:"255.255.255.0"

OK
AT+CWMODE=2


OK
WIFI DISCONNECT
AT+CWSAP?

+CWSAP:"AI-THINKER_4289FA","",1,0,4,0

OK
AT+CWSAP="SHMJ","shmj251993",5,3


OK

This is my screenshots

The WiFi module is connected to the network, it is called SHMJ

Download files :

Attiny Code
ATMEGA Code
Wi-Fi Code