Electronics Design


    
     
 Group Assignment
          
* Use the test equipment in your lab to observe the operation of a microcontroller circuit board (in minimum, check operating voltage
on the board with multimeter or voltmeter and use oscilloscope to check noise of operating voltage and interpret a data signal)

I used Digital Multimeter to measure the microcontroller operating voltage. It was about 5 volts.
     
schematic 

And the output voltage from a pin is more than 3 volts.
     
schematic 

       

 Individual assignments
 In this assignment I have to:
 * Redraw one of the echo hello-world boards or something equivalent, add (at least) a button and LED (with current-limiting resistor) or 
 equivalent input and output, check the design rules, make it, test it.

 
 Board Design:
 I have a good experience in Proteus design software and I used it in PCB design many times, but it is first time to test EAGLE. I think it will
 be a good experience.
 Fabcloud has a good  tutorial introducing EAGLE. I read it before starting and it was very helpful.  
 What is EAGLE?  
 EAGLE is an electronic design automation (EDA) software that lets printed circuit board (PCB) designers 
 seamlessly connect schematic diagrams, component placement, PCB routing, and comprehensive library content.
 
 After downloading and installing EAGLE I download and add  fab EAGLE library from this link. This library includes extra components needed 
 to design my PCB.
 Schematic Design:
 First step in PCB design is schematic, which is a simple two-dimensional circuit design showing the functionality and connectivity between 
 different components. To start a schimatic, from control panel File/new/schematic.
 
 schematic week7 

 To start adding the components, click on Library then open library. A new window will open. swlect your device then click add to schematic.
 
 schematic week7 

 Select the right package and the device will appear in the schematic
 
 schematic week7 

 To use EAGLE built in components use Add Part. 
 
 schematic week7 

 Adding connectors ans ISP connector.
 
 schematic week7 

 Add other components and connecting them.
 
 schematic week7 

 To start PCB design click on Generate or Switch to Board.
 
schematic 

 All copmonents will appear in the left corner, move them to get your final circuit. Then trace the components. 
 
 schematic week7 

 
schematic 

 To export the design as image we must:
 1. From Layer settings hide all layers except Top and Pads Layers.
 2. Select exporting Image from File/export/Image.
 3. Change the resolution to 600 dpi, select monochrome and the file path then ok.
 
 schematic week7 

 
schematic 

 Now, adding some editing to the picture using GIMP.
 
schematic 

 PCB Production:
 To calculate the G-Code of my PCB I used Fabmodules as next steps:
 
schematic 

 After that using CNC machine for milling the circuit. First install the milling tool and adjust xyz positions.
 
 schematic week7 

 My CNC machine is controlled by Mach3 software.
 
schematic 

 Now, starting milling:
 
 schematic week7 

 
schematic 

 The PCB after milling:
 
schematic 

 To make sure that all traces are connected, I used Multimeter to test them.
 

 After testing start soldering starting with the microcontroller.
 
 schematic week7 

 

 The complete circuit is:
 
schematic 




Programming and Testing
  Now, I used same steps in week 9 to uplaod a simple button program to my board.
  




Download Files:

My Design files:




Arduino Code: