Digital Counter

Project #1 Digital Counter

Objective: Create a digital counter that counts

Material:

1. Breadboards
2. 7447 IC
3. 74192 IC
4. 7419/7414 IC
5. Push button
6. 330 ohm resistors
7. Wires (hard)
8. Power Supply (12 V) 
9. LED Display
10. LM317
11. Ardiuno Uno

Description:

Retrieved from http://electronicsclub.info/images/7447.gif

• 7447 IC : This is a LED hex display driver, which contains 8 pins on each side. Each pin serves its own purpose. There are 2 most common pins like every other IC chip which is pin 8 (ground) and pin 16 (Vcc). Pin 1,2,6,7 are input signals, and pin 9,10,11,12,13,14,15 are for outputs. Pin 1,2,6,7 or B,C,D,A each have a specific number. (B=2, C=4, D=8, A=1) Manipulating these inputs will display the number you desire. For example, if there is a voltage applied on input D & input A then the hex display will show a number 9.

•  LED Display: These displays have 10 pins each and each pin will turn on a different LED. However, there is a most common standard of assigning each pins. 

• LM317 : This is a voltage regulator. Unlike other regulators that only give a constant voltage of 5V, 9V ,or 12V. This is a voltage regulator that could be design to give any voltage by changing the values of the resistors. However, it is still impossible to get a voltage output higher than voltage input.

Overview:

The picture above is the very first model that I design. I connected all the 74192 together so that it can count up to 4 digits. Each 74192 is connected to the input of 7447, which will correctly show the number that is currently at. All those resistors between the IC are for the hex displays, each of the resistor have a value of 330 ohm, and this is used for drawing current for the hex display. All the structure are carefully alligned so that its in alphabetic order from left to right (a-g). The LED on the top left corner is the indicator of power source; It is an verification of having input power. The most important among all is that this circuit uses 5V, so make sure the LM317 is adjust correctly to give an output of 5V.

Other equipments I used for this project: