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Pic18F4550 Mikroc 7Seg Display Plus Few More
Pic18F4550 Mikroc 7Seg Display Free Version Of

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The easiest way to display a number on the 7-segment is to find a way to determine or look up the pattern corresponding to the digit to be displayed.

This can be something like a table showing the numbers and the corresponding segment that should be turned ON or OFF to display something and the required number (this can be in decimal, hexadecimal or in binary format) to be sent to the port where the display is connected to in order to display a specic number.

Figure 1 shows a 2-digit 7-segment display connected to a PIC microcontroller and figure 2 shows 2-digit and 4-digit seven segment displays.

A 1-digit 7-segment display requires 7 output pins, a 2-digit would require 14 and a 4-digit would require 28, this is definitely not an efficient way of using a microcontroller.

The common widely used technique is to multiplex the digits to save inputoutput pins.

Pic18F4550 Mikroc 7Seg Display Plus Few More

All the digits share the same microcontroller pins plus few more pins to connect the digits to ground or to positive power depending on whether a common cathode or anode segments are used.

With multiplexing, a 2-digit display will require only 9 pins, a 3-digit display will require 10 pins, a 4-digit display will require 11 pins, and so on.

Another advantage of multiplexing 7-segment LEDs is to reduce the power consumption considerably.

In multiplexed applications, all the digit segments are driven in parallel at the same time, but only the common pin (e.g.

By enabling or disabling the digits so fast that it gives the impression to the eye that both displays are ON at the same time as the human eye cannot differentiate it when the speed is too high.

This technique is based on the principle of Persistence of Vision of our eyes.

If the frames change at a rate of 25 ( or more) frames per second, human eye cant detect that visual change.

For example, let say we want to display the number 67 on a 2-digit common cathode display.

Send data to display 6 on both digits.

Enable the left digit by grounding its cathode pin (send a high to the base of the transistor) and disable the right digit.

Wait for a while.

Send data to display 7 on both digits.

Enable the right digit by grounding its cathode pin (send a high to the base of the transistor) and disable the left digit.

Wait for a while (a short delay).

Go back to step 1.

The common pins of each digit are usually controlled using transistors switches, almost any NPN transistor such as the BC108-Type transistor could be used for this purpose.

A 1K resistor can be used to limit the base current to about 4mA enough to saturate the transistor.

Figure 1 shows how a 2-digit display can be connected to a microcontroller using NPN transistors to control the segment lines.

Notice that setting the base of a transistor to logic HIGH will turn the transistor ON and hence will enable the common cathode pin connected to it.

This value has to be split into the least significant and the most significant digit.

The MSD is calculated by dividing the count value by 10 and the LSD is calculated by using the mod operator ().

Pic18F4550 Mikroc 7Seg Display Free Version Of

All the files are zipped, you will need to unzip them ( Download a free version of the Winzip utility to unzip files ).

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