Redraw the echo hello-world board
Following the tutorials and the introduction in Eagle, and the tutorial in the Fab Academy 2016 EAGLE I could orient better in the interface and the construction of the circuit.
For creating your circuit, you have to go to Create Schematic. For a better management of the data you can create a project folder, where you can save the different data generated on your circuit. The most important data are the Schematic (.sch) - logical components and the Board Layout (.brd) for the actual board that we mill.
You will always have to use both windows, if you close one, you will receive a warning "F/W Annotation is severed!" It is because closing one view, while the other one is open (and making edits), will break the link between the Schematic and the Board Layout.
To use the proper components for this board I installed the Eagle library which I downloaded from the following link. Afterwards, you have to go to the Eagle content Folder > Lbr > upload the library "fab". After Installing the library, I proceeded to integrate the components in the Schematic parts.
After Installing the library, I proceeded to integrate the components in the Schematic parts
6-pin programming header: For programming the board
microcontroller: attiny44A Once the microcontroller is programmed, the program is stored in non-volatile memory. This means that it will remember the program. FTDI header: powers the board and allows the board to talk to the computer.
20MHz resonator: The attiny has a 8Mhz clock but the resonator is faster (increase the clock speed of the processor) and more accurate.
10K: Pull Down and Reset(ATTINY 44)
499 Ohm LED
Ground you can find this component in Suppliers
VCC you can find this component in Suppliers
LED Green, you can calculate the resistance of your LED in the following link: LINK
With the Command Add, you will open a window where the Fab library is located. Afterwards, select the corresponding component which you can move directly in the connection that you want to link. Press ESC to return in the Library dialog.
that looks the Sch. without connections
you could procedure to make the connections, with the The command in eagle "Net"
For connecting pins without direct visual connection, you have to do a small "net" after put the name in the connection and for better visualization you can give a label, seeing the connection with the other component.
In the first version of the Hello World, you can see that the ATtiny 44 has the PINs 5,6,10 and 11, free so we can use them. I used the pin 6 with the for the LED
Protecting the LED.
I used the PIN 5 for the button, this PIN has an interrupter, and can better manage and warm the current flow.
I did a "pull down" with the same purpose, in case of a short circuit. I can not damage the Microcontroller.
Layout After the circuit is finished you can go to the Board Layer. in the first time, I tried to use the command autoRoute to organize the automatically the connections. for a clean and Easy board it is better to do manually , and for optimize the routing it is better to do the connection manually (more fun!)
(disadvantage of autoroute: the program will use the top and bottom layer and will program different vias, that make a process to long in the realization.)
Final Eagle Job
Almost Ready to mill
IMPORTANT in the Milling Machine “cirquid” In Fab Lab Kamp-Lintfort, we have to save the cam processor, For this new Process , we need only to save the SCH and job. data
In this opportunity we visited the Fab Lab Ruhr West Bottrop, where we used the machine LASER. The machine choose can automatically the gerbers and choose the tool. For more details visit the website (Tobias Poppe Fab Academy). After the routing you can clean the board with a rough surface. You have to apply a non corrosion spray in that way. Test and check the milling spaces, especially between the place for the microcontroller.
preparingthe data The Eagle .SCH data for milling in the LPKF laser and electronics software.
The colors in the top part, representing the milling bit and corresponding thickness
Hallo Welt red bit: milling circuit. green bit: for cutting the board.
IMPORTANT: For working in this machine we don't have to do the tabs
We use the laser.. Machine, for dispensing the solder paste, in each place Changing the tool, the machine has the possibility to suck the components and it allows to place the component in the right place, you can use thin the pedal. We put the board for around 2 min in the oven and that's it ! The colors in the top part, representing the milling bit and corresponding thickness I tested the connection in the microscope and multimeter as explained in the last assignment Electronics Production.
positioning the components
ready to wake !
after soldering retorn to Fab Lab Kamp Lintfort