14. Networking and communications¶

Embedded networking and communication focuses on the hardware components, communication/data exchange protocols, and network topology and design required to link and connect embedded systems to facilitate data exchange.

Learning outcomes

Demonstrate workflows used in network design
Implement and interpret networking protocols and/or communication protocols

Like the previous weeks , student are expected to complete two (2) categories of weekly assignment.

• Group assignment:

Send a message between two projects

• Individual assignment:

Design, build, and connect wired or wireless node(s) with network or bus addresses

Group Assignment¶

For our Group assignment we will need to send a message between any combination of boards. We will need to write code that sends or receives the message in question.

The Group Assignment page is as follows Link

Group Members:

Nervene Bhagwandass
Christopher Proute
Terrence Carew
James Khan
Marvin Holloway
Ravi Baldeo

Individual Assignment¶

For my individual Assignment for Embedded Networking and Communications, I reviewed Adrian Torres Attiny 412. I designed two boards with of modifications.

Bridge
Node

Bridge¶

Electronics components what is necessary:

For work with ATTINY 412 is needed:

Attiny 412 chip
One unpolarized capacitor, 1uF
2x FTDI connector
Build in the UPDI connector 4.99 K resistor

For Power LED is needed:

LED
One Resistor, 1K

For communication Media - Vertical Pinheader pitch 2.54 mm, D=1.4 mm ( 2x2)

Chip

PIN1 >VCC
PIN2>FTDI TXD
PIN3> FTDI RXD
PIN6>4.99kΩ resistor> UPDI TXD
PIN7>1 kΩ resistor>LED>GND
PIN8> GND

CONN 2x2 Pinheader

PIN1>VCC
PIN2>ATTiny 412 PIN 2
PIN3>GND
PIN4> ATTiny 412 PIN 4

FTDI

PIN1>GND
PIN3>VCC

UPDI

PIN1>GND
PIN3>VCC
PIN5> ATTiny 412 PIN 6( between resistor and chip PIN 6)

Capacitor

GND
VCC

Node¶

For work with ATTINY 412 is needed:

Attiny 412 chip
One unpolarized capacitor, 1uF
UPDI connector

For Power LED is needed:

LED
One Resistor, 1K

b>Chip

PIN1 >VCC
PIN4> CONN 2x2 Pinheader PIN 2
PIN5> CONN 2x2 Pinheader PIN 4
PIN6>UPDI PIN1
PIN7>1 kΩ resistor>LED>GND
PIN8> GND

CONN 2x2 Pinheader

PIN1>VCC
PIN3>GND

UPDI

PIN2>GND
PIN3>VCC

Capacitor

GND
VCC

Build process¶

Programming¶

Bridge Code

I used Adrian’s Torres code and made a minor change to the RX and TX serial number code. Which i changed from 2,3 to 0,1 due to changes I made in the electronic design schematic .

#include <SoftwareSerial.h>
SoftwareSerial mySerial(0,1); //RX, TX
int v=0; 
int nodeid=1; //Node Identification
int i=0;

void setup() {
  mySerial.begin(115200); //initialize serial communications
  pinMode(4, OUTPUT); // led
}

void loop() {
  for (i=1;i<=3;i++){ // initialization; condition; increment
  mySerial.println(i); // print value to Serial
  delay(1000);
  }

  while (mySerial.available () == 0 ) {}  //while serial is 0 
  v = mySerial.parseInt();
  if(v == nodeid)        //If the value of v equals the identification of the node
{
  digitalWrite(4,HIGH);
  delay(200);
  digitalWrite(4,LOW);
  delay(200);
}
else
{
  digitalWrite(4,LOW);
 }
}

Node Code

I used Adrian’s Torres node code.

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2,3); //RX, TX
int v=0; 
int nodeid=2;//Node Identification

void setup() {
  mySerial.begin(115200); //initialize serial communications
  pinMode(4, OUTPUT); // led
}

void loop() {
  while (mySerial.available () == 0 ) {} //while serial is 0 
  v = mySerial.parseInt();
  mySerial.println(v);
  if(v == nodeid)     //If the value of v equals the identification of the node
{
  digitalWrite(4,HIGH);
  delay(200);
  digitalWrite(4,LOW);
  delay(200);
}
else
{
  digitalWrite(4,LOW);
 }
}