Week 6 - Electronic Design

Learn to modify one of our existing electronics "hello world" examples or create your own project. Add at least a buttom and a LED with current-limiting resistor.

Design circuit >> Mill board >> Solder components >> Check board

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Designing the electronic circuit with Eagle.

Milling the copper board.

Soldering components to the board.

Checking board conections.

Design Circuit

I chose Eagle to design electronic circuits helped by my classmate Raúl Diosdado at Fab Lab León.

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Electronic schema by my classmate Raúl Diosdado.

Components.

First of all we copy the electronics library from the Academy in our lbr program folder in order to choose inventoried components.

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FAB library inventored components.

We took as a reference the echo hello-world board and we added a LED and a buttom.

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Neil´s design Hello World board.

Then we open Eagle:

· File / New Project / (right buttom) New Schematic

· ADD > search for fab library and ensured that every selected component has the 1206 encaptulated.

- resonator 20 MHz > 2 is the GND (ground) and fix the direction shuld be down

- capacitator > 1µF

- resistors > 100K

- ATTINY 44-SSU > the circle marks the orientation and VCC should be top left

- AVR ISP > 2X03

- FTDI-S > 1X06SMD

- LED (+ resistor) > the end marked with a green line is the negative pole, which must be conected to ground

- buttom > 6mm_SWITCH OMRON SWITCH

· To search some specific component > introduce the name fallow by * and push search

· Start conecting components by wires

Schematic view in Eagle.

· Stick labels in the end of the cables of the ATTINY44 to reference conections between components before moving to the board mode.

- stick labels in pins 4,7,8,9,12,13

- pins 5,6,10,11 would be free for LED and buttom

- CTS and RTS should not be conected

· Move from Schematic to Board mode > File / Switch to board

· Every stuck labbels become conections between components shown in thin yellow wires.

Switch Schematic to Board view in Eagle.

· Select the wire to change the thickness of the future milling circuit tracks > File / Design rules...

Routering the components of the board in Eagle.

· Show (eye icon) > first click show and then clicking a red pin of a component it shows you wich components should be conected.

· Info (i icon) > shows properties of each component while clicking on it.

· Adjust board boundary to the traces design and change the thickness of edge > Info / Properties / Width 32 (milling tool thickness).

· All the project is saved in Documents / Eagle / "Fabricio"

· Desig with care to avoid unnecessary crossings (bridges with 0 value resistances) > For that I decided to place the LED whith its resistor in the left side of the ATTINY44 in the PA7 pin and the button in the left side with its resistor too.

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Preparing the boart to export it from Eagle to .png.

· When the design is finished > File / Export / Image (1200 dpi / monochrome / .png)

· deselect all the layers

· tracks are in TOP layer

· boundary are in DIMENSIONS layer

Preparing the boart to export it from Eagle to .png.

Inverting the boundary color to black in order to be milled.