8-Pin Pic Projects Pic12f629 Pic12f675

ezCircuit examples

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 - 233. 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.

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.

OR2. Click on Options and then click aChip 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.

The eight-pin PIC12F629 chip appears.

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.

Next enter the Functional Requirements:

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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 SwitchClick 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.

Next, go up a level by clicking Up One Level button and create a new folder called Simple Project 2.

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.

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.

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.

Example 3: Line Following RobotBuilding 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 ChipUse 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.

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.

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 LDRNow add the eyes to the robot. Select the LDR icon and add the two LDRs to the chip.

Rename the LDR sensors to LeftSensor for pin 4 and RightSensor for pin 5.

Save the project and the robot circuit is now complete.

Example 4: Reaction GameStep 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.

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 selectionThis project uses the PIC12F629 chip. Since this is a New Project the PIC12F629 chip is the default chip.

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

Step 4: Add Push Button SwitchFrom 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.

Step 5: Add buzzerSelect the Buzzer icon in the Groups of Circuits menu. Add the Peizo Buzzer to pin 5 of the chip. Rename it to Alarm.

Step 6: Add New circuitIn 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 . The following window appears.

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.

Give the circuit a description. Click Next.

Add the list of components for the circuit. Click Next.

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.

Add an image file that represents the circuit. Use the Browse Button to browse for the image to use. Click on Set Up Connections.

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

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.

