**
Hexadecimal counter
Electronic**

74HC00, 74HC191

We're now going to find out how to express the hexadecimal numbers 0-15 in four-digit binary numbers, using a counter IC. The counter IC outputs hexadecimal numbers when clock pulses are input.

The relationship between the hexadecimal numbers and the binary numbers is shown in Figure 1.

Before using this project, remember that 1 is expressed when the LED is ON and 0 when it is OFF.

Wire the project and turn power ON, and see what the LEDs are doing. Do they display 0 ?

Now, give a flip to S1 and see what number is displayed. It's 1.

Press S1 while watching Figure 1, and see how this counter works.

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