Jose Alegria - Fab Academy

Embedded Networking

ASsignment

wHAT iS THE ASSIGNMENT ABOUT?

Design, build, and connect wired or wireless nodes with network or bus addresses.

Group Assignment:

Send a message between two projects.

1^st Step. Setting up the network

The first part of the assignment was to understand how the bus works. There are two communication ports within our processors, these are:

- SDA: Serial Data, transmits the information from one board to another.

- SCL: Serial Clock, sets the parameters for the boards to know when to expect information.

All lines must have resistors to pull up to High when nothing is being transmitted.

Every board connected to the network must have an address. This must be a 7 bit number.

In order to connect to the network, Arduino has a library called <<Wire.h>> which also works with our SAMD11C14 boards, so we are going to use it.

2^nd Step – Wiring

The assignment consist in making that two boards work together by sending a signal between them. To make them work together I will be connecting 4 wires to each of the boards:

- SCL to SCL

- SDA to SDA

- 5V to 5V

- GND to GND

This is a main and one secondary board setup, as you can see the wiring for each of them is the same:

Main Board

Secondary Board

3^rd Step – Secondary boards

Once I have got both boards wired, they will be divided into two classes: a main board which will be used to give instructions to the other board which is called a secondary board and it will be receiving the instructions. These will have different codes programmed into them:

Code:

4^th Step – Main Board

This will be the last one to be programmed because it needs to have the addresses and the codes for the secondary boards. The code goes as follows:

5^th Step – Operation

This setup allowed me to write into a secondary board. When writing a letter into the main board through the serial monitor, it transmits an order to the secondary board.

This is what the serial monitor looks like when working this setup:

And that translates to the boards as follows:

Conclussions

The networking assignment sounded really intimidating. When I understood what each of the pins was doing it became really interesting and evolved into a great potential for my boards and projects.

Original Files

1. Master code

2. Secondary code

Nueval Checklist

- Linked to the group assignment page and reflected what you learned individually of the group assignment.

- Documented your project.

- Documented what you have learned from implementing networking and or communication protocols.

- Explained the programming processes you used.

- Outlined problems and how you fixed them.

- Included design files and original code.

2022