EMBEDDED PROGRAMMING

For the assigment of this week it is necessary to to realize a modification to the card I begin hello-world, in which debere to install a button and a led to realize some routine that we must programme in a later task. The first thing is to copy the original graph of the card in which the following components are had:

Microcontrolador AtTiny 44

Oscillator,

Connector ISP,

Connector FTDI,

Resisters

capacitors

The selected program is EAGLE PCB, in his free version. The free version has bounding as are not able to realize major plates of printed circuit to 10 x 10 cm and plates of 1 or 2 you geld at the maximum.

https://circuits.io/eagle/

Here we have neither the button nor the led, now he will join, but realizing a previous consultation in the leaves of specifications of the AtTiny 44 to check the connections.

http://ww1.microchip.com/downloads/en/DeviceDoc/doc8183.pdf

Here we have the graph:

With the previous thing and taking the graph as a reference we proceed to connect the button and the led with a limitor resister of current to avoid to  damage it. It is possible to observe that PB3, PB2 and PA7 are the posible pines of connection. 

Now it is necessary to to edit the card where we will have 2 principal ways of realizing the arrangement and design of the tracks, on having realized the change by means of the " switch board ", the components and the tracks are updated, in such a way that it is am the final version and the correct one to be loaded on the publisher of card.

The graph with the button and led

We continue with the process of the design: 

We export the file in format PNG to be able to generate the paths in Fab Modules and of this form realize the card PCB.

She will be schemed in one By Roland MDX-20 

http://support.rolanddga.com/_layouts/rolanddga/productdetail.aspx?pm=mdx-20

I place the plate of phenolic with copper

In Fabmoduls we give the properties of court

https://www.youtube.com/watch?v=T0SggmZiSCk

I started with a speed of court of 4 mm/min for a cutter Diameter of the tool of 1/8”, diameter of court of 1/64”.

https://www.traverstool.com.mx/hcar_30/20-411-011.html

For experience in previous practices, the best sera to machinate to very low speeds

Starting machinating

Completed

Plate ready to start welding the components

The components

Finished and ready plate