Networking and Communications

Project description

Group Assignment

Send a message between two projects.

Individual Assignment

Design, build, and connect wired or wireless node(s) with network or bus addresses and local input &/or output device(s). I learned to use I2C that uses 4 wires VCC, GND, SDA and SCL. In an I"C (Inter-Intergrated Circute), SDA (Serial-Data) is usedfor the bidirectional data transfer, while SCL (Seriial Clock) is used to syncronize the data transfer between devices. With 7-bit addressing you can have up to 127 nodes in the network. Problems I encounted: node 2 board wasnt soldered properly and I had to use jumper wires to get it to work. (pic down below)

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Machines, Programs and Tools

Mac computer, screen, GitLab, HTML site, patience. For this assignment I made a wired network of ATTony 412 using the I2C communication standard. One ATTiny 412 acts as the controller while two other AATiny 412 act as nodes. The controller sends a request to the network and the nodes answer. I used the technique that I learned in week 6 and built on it.

Introduction

This week we had to make a PCB board that could communicate. I had to design the PCB board from scratch and make the connecting wire.

Projects

Board design : I2C Control / I2C Nodes

The board needs a few things to be able to communicate using I2C, resistors, SDA lines, 4pins for the VCC, GND, SCL and SDA lines for I2C communication so I added that to my design.

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Roland modela mdx-20 : I2C Control / I2C Nodes

I used fabmodules to make the toolpath for the circuts. I stared with downloading the file and make a pattern for the board. I opended the file in InkScape and make a few minor changes. Then I made a white box to put behind the file. When I was done I exported the files making sure that the DPI was set to 1000 then I moved the top layer to see only the white box was exported the white box making sure that the DPI was set to 1000. I then moved both files to my USB drive.

I2C Control / I2C Nodes - Andri Sæmundsson - Fab Academy 2023

Soldering : I2C Nodes

I2C Nodes Item list

	Name	Quantity
Item1	ATtiny 412.	1x
Item2	RES 1K OHM 1% 1/4W 1206.	1x
Item3	RES 4.99K OHM 1% 1/4W 1206.	2x
Item4	LED Blue Clear 1206 SMD.	1x
Item5	Capacitor 1 uF SMD.	1x
Item6	Single Row Side-Insertion Pin 1X3 2.54mm.	1x
Item7	Dual Row SMT Type Pin Header 2X2 2.54mm.	1x
Item8	Button 6.0x6.0mm.	1x

Soldering : I2C Control

I2C Control Item list

	Name	Quantity
Item1	ATtiny 412.	1x
Item2	RES 1K OHM 1% 1/4W 1206.	1x
Item3	RES 4.99K OHM 1% 1/4W 1206.	2x
Item4	RES 0.0 OHM 1% 1/4W 1206.	2x
Item5	LED Blue Clear 1206 SMD.	1x
Item6	Capacitor 1 uF SMD.	1x
Item7	Single Row Side-Insertion Pin 1X3 2.54mm.	1x
Item8	Single Row Side-Insertion Pin 1X6 2.54mm.	1x
Item9	Dual Row SMT Type Pin Header 2X2 2.54mm.	1x
Item10	Button 6.0x6.0mm.	1x

Board design : I2C Control / I2C Nodes

All the parts and the connector cable.

Closeup.

A closer of the board and cable, all connected. All parts have been soldered in place.

I got the cable from my instructor to program the board.

Programing board and cable.

Week6

Output Devices: Code

Refresher on the code and devices previously used in project. I used Arduino to program the board.

Code : I2C Control / I2C Nodes

I2C Control / I2C Nodes - Andri Sæmundsson - Fab Academy 2023

ATtiny412 control I2C Code

ATtiny412 control I2C Code Zip

ATtiny412 node 1 I2C Code

ATtiny412 node 1 I2C Code Zip

Summary

Designing the board went ok. Soldering it was a nightmare. I had to make 7 boards with three of them ending up working. The milling of node 1 wasnt good enough so I ended up having to splice a wire between two points. I had to update the Arduino site for it to be able to send the code. What code does is alert me if the buttons are pushed. I will send me a message that a button was pushed on node 1 or node2. The node sends a message to controller that confirms a signal was recived and you got a message (in my case) on the Arduino site.