Week6 electronics design (Mar 2)
1.redraw the echo hello-world board.
2.add (at least) a button and LED (with current-limiting resistor)
3.check the design rules, and make it
4.extra credit: simulate its operation
1. EAGLE PCB Design Software
2. GIMP
Comprehend the schematic symbols before design the electronics schematic.
Download the SparkFun-Eagle-Libraries-Master.zip.
Update the library. Unzip and copy SparkFun-Eagle-Libraries-master to eagle lbr file.
Add parts to the schematic. Firstly, Start necessary library and get into the ADD to search your needed parts.
Create parts. If Eagle Library has not searched your needed part, you can create a new one. For example, we can create the ATTINY 44A-SSU. In the package process, we can copy needed symbol to the new from another part in order to accelerate develop speed. Finally , Set the relate parameter to complete your package.
Redraw the echo hello-world board.
Create a project->schematic->board.
Using add tool to add parts to schematic.
Modify parts name and describe.
Add the led and button to schematic.
The led forward voltage is 3V and forward current is 20MA so that I Chose to use 100OHM Resistor.
Generate board. Autorouter and Adjust the route.
Export the .png file of the trace.
Using the GIMP to Process the .png file and add Text.
The padding is too short cause cut the circuit.
Components list:
1 ATTINY 44A SSU Microcontroller.
1 20M CRYSTAL RESONATOR.
1 10KOH RESISTOR.
1 100OH RESISTOR.
1 1UF CAPACITOR.
1 LED.
1 SWITCHWMD.
1 AVRISP PIN.
1 FTDI header.
1. Doesn't find the necessary part , download and update eagle library.
2. Moving the parts and wire, must select the "+" of part.
3. Must to use the 1206 component.
4. Keep the size of outline is larger than edge of trace.
5. Keep the width has 20px between trace and outline.
GIMP
SparkFun-Eagle-Libraries-master
trace
outline
component
helloworld project