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8-pin PIC Projects PIC12F629 PIC12F675
ezCircuit Designer (ezCD)
ezCircuit Designer is an integrated graphical program. ezCD fast tracks the design of
electronic circuits, documentation and the CoreChart assembly program that runs the
microcontroller. It comes with example templates.
This document contains four (4) ezCD examples based on the 8-pin PIC chips.
1. Example 1: Simple Door Alarm System Page 1 - 16
2. Example 2: Simple Door Alarm System 2 Page 17 - 23
3. Example 3: Line Following Robot Page 24 – 26
4. Example 4: Reaction Game Page 27 - 38
Example 1: Simple Door Alarm System
Step1: Create New Project
Start up ezCircuit Designer program and click on “New Project”.
Give the project a name and save the project. Type in the project name “Simple Door
Alarm System”. Browse and save the file in a suitable location. Click OK.
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Step 2: Select Chip
By default ezCircuit Designer uses the PIC12F629 chip. The following shows the steps to
select a chip.
1. Select the “Chip Icon” from the menu bar.
OR
2. Click on “Options’ and then click a’Chip
Selection…”.
3. Double click on the chip in the main diagram.
A Chip Selection table pops up with the list of chips that ezCircuit Designer supports.
Select “PIC12F629” by clicking on it and click OK.
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The eight-pin PIC12F629 chip appears.
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Step 3: Create documentation
A project with proper documentation will make the process more organized and simple to
trace. ezCD has an in-built documentation generator.
To create a document, select “Create Document” under the “Documentation” menu. Next
select “Specification”.
The following window will pop up. Select “Introduction” and then click “Edit Content”.
Type in the introduction as shown below and then click Save.
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Next enter the “Functional Requirements”:
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Step 4: Power supply
For an electronics device to operate, the most basic requirement is a power supply. In this
example the Power Supply for the chip is already allocated. Double click on one of the
power supply connections to view the details.
This will bring up the circuit diagram for the power supply.
Rather than using a Voltage Regulator we will choose a simpler Power Supply.
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Go back to the Main screen by pressing the Return To Main button in the top right hand
corner.
Highlight the “Power Supply 1” by clicking on one of its connections and then press
“Delete” on the keyboard to remove the circuit.
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Step 5: Add Power Supply
We will now add a new power supply circuit by
choosing the Power Supply icon in the “Groups of
Circuits” panel.
A list of different power supplies will appear.
Choose Zener Diode Regulator. A list of
Connections will appear. Notice that Connection 1
is already highlighted.
The VDD power supply pin on the chip is also highlighted ready to accept a Connection.
Click on this highlighted pin on the chip to add Connection 1 to the chip. Another pin on
the chip is then highlighted to accept the next Connection for the Power Supply circuit.
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Step 6: Alarm Buzzer
Now that the Door Alarm has a Power
Supply Circuit add other input and output
circuitry. Click on the Buzzer icon in
“Groups of Circuits” menu and choose the
Peizo Buzzer. Click on the highlighted pin
number 7 on the chip to add the Peizo
Buzzer.
Notice the Buzzer circuit is connected to the chip as an output device.
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Step 7: Alarm Trigger Switch
Select an Alarm Trigger switch to complete the circuit. Click on the “Push Button
Switch” icon in the “Groups of Circuits” menu. Next, click on the highlighted pin number
6 on the chip to add the Push Button switch circuit.
The Door Alarm circuit is now complete.
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Step 8: Rename pin
This is an extra section that will not affect the functionality of the Door Alarm circuit.
We will rename the labels for clarity. We will change the name “Button6” to “Trigger”.
Right Click on the label in the box and choose Rename. Delete the name “Button6” and
type in “Trigger”.
Click on “Save” under “File” in the main menu to save the project.
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Step 9: Export Part List
Click on “View Parts List” under “Documentation” in main menu to view a list of parts
for the Door Alarm circuit.
After clicking on “View Parts List” the following window will pop up. Save the Parts
List into an Excel file by clicking on “Export to Excel” or save it as a Text File by
clicking “Save” under “File” in the main menu. The Part List can be printed out.
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Step 10: Test Procedure
ezCircuit Designer generates a Test Procedure to check for faults or errors on the
hardware circuit. Click on “View Test Procedures” under “Documentation” in the main
menu to view the Test Procedures.
The “Testing Procedures” window pops up as shown below. Save it as a Text File by
clicking “Save” under “File” in the main menu.
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Step 11: Generate CoreChart Test program
When the hardware circuit is built and fully tested using the Test Procedures, test the
circuit inputs and outputs with the CoreChart test program. ezCircuit Designer generates
the CoreChart test program. Click on “Send to CoreChart” under “Options” in the main
menu to generate a CoreChart Test program.
Note: Ensure that CoreChart is installed.
CoreChart will startup automatically and the window below will appear. Click “Import”.
After importing the ASM file into CoreChart, your test program should appear as below.
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In the program there is a “Buzzer07Test” subroutine to test the buzzer.
To view the User Variable List click “Variables…” under Edit in the main menu bar. The
pin names have been translated to Bit Variables in CoreChart. This will save time in
matching the Port Pins to the Circuit.
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Example 2: Simple Door Alarm System 2
This example is based on Example 1. In Example 1, the circuit detects the switch
“trigger” to turn on the alarm. In Example 2, add an indicator to show the state of the
alarm and a reset button to reset the alarm after the alarm is activated. 3 additional
components are added to accomplish this. They are a Push Button Switch, a Red LED
and a Green LED.
Step 1: Start ezCircuit Designer and Load Existing Files
After starting ezCircuit Designer click on “Existing Project”.
Click on “Simple Door Alarm System.ezproj” to open the file.
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The “Simple Door Alarm System.ezproj” project should look like this.
Step 2: Add LED
Click on the LED icon in the “Groups of Circuits” menu and select “Active High” in the
“Circuits” menu. The compatible pin is highlighted. Click on pin number 5 of the
PIC12F629 chip to connect the LED.
Rename “LED5” to “LED_RED”
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Step 3: Add Second LED
Click on the LED icon under the “Groups of Circuits” menu and connect the “Active
High” LED circuit to pin number 2 of the PIC12F629 chip and rename to
“LED_GREEN”.
Step 4: Add Input Push Button Switch
Click on the “Push Button” icon under the “Groups of Circuits” menu. Choose the Reset
Button and connect it to pin 4.
Step 5: Save As
Click “Save As” under the “File” in the main menu to
save the project.
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Next, go up a level by clicking “Up One Level” button and create a new folder called
“Simple Project 2”.
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Double click on the new folder and type in “Simple Door Alarm System2” in the “File
name” text box. Click “Save” to save the new project.
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Step 6: Generate CoreChart test program
Follow the same procedure as in Example 1.
Note: Ensure CoreChart is installed.
Click “Send to CoreChart” to generate the test program.
CoreChart will start up automatically and a window below will appear. Click “Import”.
After importing the ASM file into CoreChart, the test program is generated as shown
below.
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The test program shows the subroutines to test the Buzzer and the LEDs.
To view the User Variable List click “Variables…” under “Edit” in the main menu bar.
The pin names have been translated to Bit Variables in CoreChart. This will save time to
match the Port Pins to the Circuit.
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Example 3: Line Following Robot
Building a robot is not rocket science anymore. The following example uses ezCircuit
Designer to design a line following robot with two sensors and two motors.
Create a New Project as shown in Example 1.
Step 1: Select Chip
Use the PIC12F675 as the “brain” of the robot. Click on “Chip Selection” under
“Options” of the main menu or click on the “Chip icon” on the menu bar to select the
chip. The following screen of the “PIC16F675” chip appears.
Step 2: Create Documents
Go to “Create Document” under the “Documentation” menu. Next select “Specification”.
Type in the “Introduction” and “Functional Requirements” as shown below. Click “Save”
after typing in the details.
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Step 3: Add Motor Driver
Select the “Motor Driver” Icon in the “Groups of Circuits” menu.
The motor driver needs to be connected to four pins on the chip.
Click on pins 7, 6, 3 and 2 on the chip to connect the Motor Driver Circuit to the chip.
Click on pins 7, 6, 3 and 2 to connect the circuit as shown below.
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Rename the pin names of the “Motor Driver” to the names as shown below. This will
make the project easier to understand.
Step 4: Add LDR
Now add the “eyes” to the robot. Select the LDR icon and
to the chip.
add the two LDRs
Rename the LDR sensors to “LeftSensor” for pin 4 and “RightSensor” for pin 5.
Save the project and the robot circuit is now complete.
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Example 4: Reaction Game
Step 1: Start new project
Start ezCircuit Designer and choose Create New Project or if a project is already open
choose New from the File menu.
To create a document, select “Create Document” under the “Documentation” menu. Next
select “Specification”.
Click on “Introduction” to highlight it. Click the “Edit Content” button.
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Write the introduction about the project and then click “Save”.
Do the same with the Functional and Non-Functional Requirements, Requirements
Specification Rationale and use the Appendix for references.
Step 2: Chip selection
This project uses the PIC12F629 chip. Since this is a New Project the PIC12F629 chip is
the default chip.
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Step 3: Add LED
Choose the LED icon in the “Groups of
Circuits”. Then select “active HIGH” in the
“Circuits” menu and click on pin 2 of the chip.
Add the same LED circuit to pins 3 and 7 on the
chip.
Rename each of the LED circuits. Right click on the LED label and choose Rename.
Change the LED names as follows:



LED2 to CentralLEDYel
LED3 to Player1Green
LED7 to Player2Green
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Step 4: Add Push Button Switch
From the “Groups of Circuits” menu click the “Push Button” icon
. Select the “Pull
up” circuit in the “Circuits” menu.
Add the “Push Button” circuit to pin 4. Add the same circuit to pin 6 as shown below.
Rename “Button4” to “Player1Button” and “Button6” to “Player2Button” as shown
below.
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Step 5: Add buzzer
Select the Buzzer icon in the “Groups of Circuits” menu. Add the “Peizo Buzzer” to pin 5
of the chip. Rename it to “Alarm”.
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Step 6: Add New circuit
In this section learn how to add in a “new” circuit to ezCircuit Designer. This project
adds a simpler power supply circuit to the ezCircuit Designer.
Select the “Add Circuit” icon at the bottom of the “Groups Of Circuits”
following window appears.
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Click on the “Add New Circuit” button.
Select Power Supply under “Circuit Groups”. The new circuit appears in the list of
available power supplies in ezCircuit Designer.
Click “Next”.
Name the new Power Supply circuit “One Diode PS”. Then click “Next”.
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Give the circuit a description. Click “Next”.
Add the list of components for the circuit. Click “Next”.
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Enter the Test Procedure for the circuit. Click “Next”.
Each pin on the chip has different possible functions e.g. some pins are used to control
the Oscillator, some are used as Resets and others are used as Power Supply pins. If the
circuit needs to use some of these functions then set this requirement as a “Special Case”.
Since the Power Supply is a Special Case choose the “Power Supply Special Case” for
this circuit as shown below. Power supplies do not need pin names. Choose “No Pin
Names” option in the list.
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Add an image file that represents the circuit. Use the “Browse Button” to browse for the
image to use. Click on “Set Up Connections”.
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When the image is selected, add connections to the circuit. Click on “Add” to bring up
the “Add New Connection” window. Type in pin name and choose its properties from the
“Modes” menu. Add a VSS connection and call it “VSS”. Tick the VSS mode box. These
modes ensure that the chip pins are compatible with the circuit connections. If no mode is
selected the circuit will not connect to any chip pins. Click on “OK” to add connection.
Repeat this for the VDD connection making sure you tick the “VDD” mode.
If there is a Proteus (Section) file for the new power supply circuit then enter the path of
the file. Click “Finish” to close the “Add Circuit Wizard”
The circuit should be available in the “Power Supply” Circuits group
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Delete the “power supply circuit” to be replaced by selecting one of its connections and
pressing “Delete” key on the keyboard. Then add the new “One Diode PS” to the chip.
Congratulations! The design is now complete. Export to CoreChart and start
programming.
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