November 2012
Intermediate to advanced
496 pages
12h 2m
English
Content preview from Using LEDs, LCDs and GLCDs in Microcontroller Projects
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10.1 PROJECT 10.1 – Single Digit Up Counting 7-Segment LED Display
10.1.1 Project Description
This is perhaps the simplest 7-segment LED project we can have. In this project, a 7-segment LED display is connected to PORT D of a PIC microcontroller. The LED counts up from 0 to 9 and then back to 0 continuously, with a 1 second delay between each count.
10.1.2 Block Diagram
The block diagram of the project is shown in Figure 10.1.
Figure 10.1 Block diagram of the project
10.1.3 Circuit Diagram
The circuit diagram of the project is shown in Figure 10.2. A common-cathode type display is used in this project (see Chapter 5), where the cathode is connected to ground and a segment is turned ON by setting it to logic HIGH. The segments are driven using current limiting resistors. In this project, a PIC18F45K22 type microcontroller is used, but any other model with at least 7 I/O ports can also be used. An 8 MHz crystal is used to provide the clock signals. The microcontroller is Reset using an external push-button.
Figure 10.2 Circuit diagram of the project
10.1.4 Project PDL
The PDL of this project is very simple and is given in Figure 10.3.
Figure 10.3 PDL of the project
10.1.5 Project ...
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