Ho Chi Minh City University of Technology

FACULTY OF COMPUTER SCIENCE & ENGINEERING

Laboratory Manual

Electronic Devices and Circuits

Fast blinking LED bike light circuit

Ho Chi Minh City, 3/2017

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1. Goals:

Draw and layout the fast blinking LED bike light circuit using Altium

Make the PCB using CNC machine

2. Draw and layout the circuit using Altitum:

2.1 Create new PCB project:

Create new PCB project (File -> New -> Project -> PCB project)

Add new Schematic and PCB to the current PCB project (Project -> Add New to

Project -> Schematic/PCB)

Add “Usual Devices.PcbLib” and “Usual Devices.SchLib” to the current PCB project

(Project -> Add Existing to Project -> location of “Usual Devices.SchLib/PcbLib”)

Save the Schematic, PCB and project to a local folder as “FlashLED”

Finished these above steps, we have the PCB project structure as follow:

2.2 Draw the schematic

Slect the FlashLED.SchDoc (double click)

Place components to the SchDoc by open “Browse Libraries” window (Place -> Part

then click Choose button), select “Usual Devices.SchLib” in Libraries drop down box

Type “res” (resistor) in the Mask field select Res1 then OK, the Place Part window

shows the selected component. Select OK to place the component on to the SchDoc.

We use Designator and Comment to identify a component. Open Properties for Schematic

Component window (double click the component), then input the correct value at Comment

field and uncheck the Value Visible check box.

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Repeat these above steps for other components except Header2 component (in Miscellaneous

Connectors.IntLib) to draw the fast blinking LED bike light circuit as below:

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Modify the default footprint for the components:

Open Footprint Manager window (Tool -> Footprint Manager)

Select components that we want to modify the default footprint (Step 1)

Click Add… button (Step 2)

Click Browse… button (Step 3) to select the right footprint

Select the “Usual Devices.PcbLib” (Step 4)

Filter the footprint by typing the keyword in the Mask field (Step 5)

Select the right footprint (Step 6) then click OK

Right click the new added footprint, then select Set As Current to change the default

footprint for the selected components (Step 7)

Apply the changes by click the Accept Changes (Create ECO) button then Excute

Change (Step 8)

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The final right footprint as shown below:

Change the pins order of C1815 and A1015 transistor according the actual transistor that we

have (1E; 2C; 3B).

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Open “Properites for Schematic Component in Sheet” by double click C1815/A1015

component

Click Edit Pins… to open “Component Pin Editor”

Input the right value at Designator column as shown in the picture below.

2.3 Layout the PCB

Transfer the circuit from schematic to PCB document (Design -> Update PCB document)

After Execute Changes, all added components are shown in the PCB document, then select the

“FlashLED” room (brown box) and drag into the black zone, then delete it.

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Change Measurement Unit to Metric (Step 1) and modify grid parameters (Step 2) (Click

Grids… button, then double click Global Board Snap Grid, select Steps = 10mil, click OK to

apply and exit the setting)

Arrange the components by moving (click + drag), rotating (click + space), zooming (control +

scroll the middle button of the mouse) as shown below:

Draw a rectangle to define the board boundary (Place -> Line, press Tab to enter Line

Constraints, then select Keep Out Layer in Current Layer drop box)

Define the board shape and set the origin:

Select the rectangle at Keep Out Layer (Shift + click four edge of the rectangle)

Design -> Board Shape -> Define from selected objects

Edit -> Origin -> Set (move mouse to the bottom left corner of the rectangle then

click at that position to define the new origin)

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Setting two “Design Rules” (Design -> Rules…): Clearance = 0.6mm; Routing Width = (min

= 1mm, preferred = 1mm, max = 2mm)

Routing the nets at bottom layer:

Select Bottom layer as current layer (Click the Bottom layer tab)

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Enter routing mode (Place -> Interactive Routing)

Routing the nets as shown above (right click to escape the current net)

Press 3 to enter 3D view mode, Press 2 to enter 2D view mode

3. Making PCB using CNC machine:

3.1 Export PcbDoc to Gerber

We need to export the PcbDoc to Gerber as the input of CNC USB program as follow:

Select FlashLED.PcbDoc (double click the FlashLED.PcbDoc in project view)

Enter Gerber Export Wizard (File -> Fabrication Outputs -> Gerber Files)

In tab General, select Units = Milimeters, Format = 4:3

In tab Layers, select Plot Layers = Used On

In tab Drill Drawing, select Plot all used layer pairs at Drill Drawing Plots and

Drill Guide Plots

In tab Advanced, select Leading/Trailing Zeroes = Suppress trailing zeros

Select OK to export the Gerber Files

3.2 Setup the CNC USB Controller

Identify the CNC machine #id and setup the right parameters:

Import the setting file cnc_H6.setting for the Machine #1, #2, #3 and cnc_C6.setting for the Machine #4

(File -> Import Setting…)

Import the license file cnc2030_goi4_may#id.lic for the Machine #id = 1, 2, 3 (Help -> Import

License…)

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3.3 Engrave the PCB tracks at Bottom Layer

Import the FlashLED.GBL file into the CNC USB program (File -> Import Gerber …)

Modify the default setting as follow:

3.4 Engrave the PCB outline at Keep out Layer

Import the FlashLED.GKO file into the CNC USB program (File -> Import Gerber …)

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Modify the default setting and the result as follow:

3.5 Drill the PCB

Import the FlashLED.GBL file into the CNC USB program (File -> Import Gerber …)

Modify the default setting and the result as follow: