![Background Image](img/week5/13.jpg)
Electronics Design
This week we learned electronics design through redesigning the echo hello-world board, improvise to our own version, make it and test it.
![Background Image](img/week5/9.jpg)
Schematic & Board
![image](img/week5/1.jpg)
Draw schematic on Eagle
The components: Microcontroller, 'Pull-up' resistor, Capacitor, Crystal Oscillator, SMD Bus Connector, FTDI Connector.
![image](img/week5/2.jpg)
Lay out the board
![image](img/week5/3.jpg)
Auto-routing
Eagle has the auto-routing method. Though not smart enough, yet save a lot of time for wiring it. Parameters like milling width, clearance, trace type, efforts are tunable.
![image](img/week5/4.jpg)
Traces
![image](img/week5/5.jpg)
Fail #1
The space in between two traces is too small that the trace cannot mill it correctly. So I need to go back to the clearance page to adjust it.
![image](img/week5/6.jpg)
Layout two
![image](img/week5/7.jpg)
Routing
![image](img/week5/8.jpg)
Fail #2
The milling header is too hight that it can't mill through. So I calibrate the height based on the height of the middle part of the board, instead of the border of the board which is a bit higher.
![image](img/week5/9.jpg)
Milling
![image](img/week5/10.jpg)
Connection
The two lines on the top right are too close to each other, that they remain connected after the milling.
![image](img/week5/11.jpg)
So I manually disconnected it.
![image](img/week5/12.jpg)
Soldering
![image](img/week5/13.jpg)
I 💘 Electronics
![image](img/week5/14.jpg)
Air wires
![image](img/week5/15.jpg)
Testing