Page 35 - ARM Based Microcontroller Projects Using MBED

2.4 SUMMARY 21

EXAMPLE 2.4
An analog pressure sensor is connected to one of the analog-to-digital (ADC) input ports of a mi-
crocontroller. Additionally, an LCD display is connected to the output ports. It is required to read
the pressure every second and then display on the LCD. Show the required algorithm using a PDL
and also draw the equivalent flow chart. Assume that the display routine is a subprogram called
DISPLAY.
Solution 2.4
The required PDL is:
BEGIN
DO FOREVER
Read Temperature from ADC port
CALL DISPLAY
Wait 1 second
ENDDO
END
BEGIN/DISPLAY
Display temperature on LCD
END/DISPLAY

The required flow chart is shown in Fig. 2.17.

FIG. 2.17 Flow chart solution.

2.4 SUMMARY

In this chapter we have learned about the following:

• Program development cycle
• Hardware development cycle