PRACTICAL TRAINING MODULE/EXERCISE

1. DEPARTMENT: COMPUTER/ICT
2. SECTION/TRADE: COMPUTER CRAFT
3. CLASS: COMPUTER CRAFT YEAR 1
4. TOPIC: NUMBER SYSTEM (BINARY CODE DECIMAL (BCD) SEVEN SEGMENT CODE)


5. OBJECTIVE/SPECIFIC LEARNING EXPERIENCE:
     At the end of the practical Training module, the students should be able to:
   (i) Describe the BCD code
   (ii) Convert 4-bit binary code to BCD code
   (iii) Describe the seven segment display code
   (iv) Identify the two different types of seven segment Display Device
 
6. WORKING CIRCUIT/DIAGRAM/DESCRIPTION:

 This is the working circuit for the practical project. You will buy 7 switches, 7 resistors of 270 ohms, 4 x 1.5 AA battery (Medium size), buy common cathode seven segment display device. Locate the common cathode pin and connect it to the -ve pole of the battery. Locate the A to G segment of the device, by testing each pin to see which pin light each segment. Then connect the circuit as shown by the circuit diagram. Note that the pins of the seven segment you will buy in the market will not be arranged as in the diagram, for this one is just for presentation. The one you will see in the market will look like the one below. Get a circuit board and mount the device and each switch that will control each segment.

From the diagram below, there are two display. One on the left is actual device, while the one on the right is show the internal circuit arrangement of the the device. From the one on the right, you will see that the device has 10 pins. 5 pins up and 5 down. The two middle pin from up and down is the same thing, you can be sure of this if you trace the Gnd pin from up down. So, to connect the ground, you just need to connect one of it to the negative pole of the battery (which is the one down). The last pin down on the right is not needed in this project so ignore it.

Watch the Animation below to get the idea of the kind of result you will get when you test your final circuit.

TRY AND OBSERVE THE CLOSING AND THE OPENING OF THE SWITCHES AND HOW IT AFFECT WHAT IS DISPLAY BY THE DISPLAY DEVICE.

7. LIST OF MATERIALS:

    (i) Seven pieces of switches (the type like these ones shown below)

                        

        if you buy the first one, the middle pin and the pin for the side marked '1'          is connected.

       (ii) Common cathode 7-Segment Display

       (iii) Seven pieces 270 ohms resistors

       (iv) circuit board

       (v) 4 pieces (1.5) batteries

       (vi) 4 sides battery container

       (vii) connecting wires

The materials above are those needed for the project, but the one below are going to be your working tools when you resume for proper training.

8. REQUIRED TOOLS:

     (I) Project Board

     (ii) Digital Multimeter

     (iii) Small Electronic screw tool box

     (iv) connecting wires (flexible wires)

     (v) Soldering iron

     (vi) Soldering lead

     (vii) light Emitting Diode (LEAD), RED (10), Yellow (10), Green (10)

     (viii) 5 circuit boards 

  PROJECT QUESTION:  

FROM THE TOPIC SHOW CASE SO FAR ON THIS SITE

1. EXPLAIN AND DESCRIBE THE BCD CODE

2. EXPLAIN AND DESCRIBE THE SEVEN SEGMENT DISPLAY CODE

3. FINALLY FOUND OUT HOW BCD CODE AND SEVEN SEGMENT DISPLAY CODE WORK TOGETHER (YOU CAN FIND MORE INFORMATION FROM OTHER SITE FOR THIS).   

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