Page 112 - ARM Based Microcontroller Projects Using MBED

98 7. USING THE Mbed WITH SIMPLE PROJECTS

7.8 PROJECT 5—BINARY COUNTING LEDs

7.8.1 Description
In this project 8 external LEDs are connected to PORT C the Nucleo-F411RE development
board as in the previous project. The LEDs count up in binary every second as shown in
Fig. 7.32.

7.8.2 Aim

The aim of this project is to show how external LEDs can be connected to the Nucleo-
F411RE board and how a program can be written so that the LEDs count up in binary.

7.8.3 Block Diagram
The block diagram of the project is shown in Fig. 7.25, where 8 LEDs are connected to PORT
C pins of the Nucleo-F411RE development board.

7.8.4 Circuit Diagram

The circuit diagram of the project is shown in Fig. 7.26 where the LEDs are connected using
current limiting resistors.

7.8.5 The PDL

Fig. 7.33 shows the PDL of the program.

FIG. 7.32 LEDs counting up in binary.