Page 36 - ARM Based Microcontroller Projects Using MBED

22 2. MICROCONTROLLER-BASED PROJECT DEVELOPMENT CYCLE

• Program development tools
• PDLs
• Flow charts

2.5 EXERCISES

1. What are the advantages and disadvantages of flow charts?
2. It is required to write a program to calculate the sum of even integer numbers from 1 to 10.
Draw the flow chart to show the algorithm for this program.
3. Write the PDL statements for exercise (2) above.
4. It is required to write a function to calculate the area of a cylinder given its radius and
height. Draw flow charts to show how this function can be implemented. Also, draw a
flow chart to show how the function can be called from a main program to calculate the
area of a cylinder whose height is 2.5cm and its radius is 3cm.
5. Draw the equivalent flow chart for the following PDL statements:
BEGIN
DO 10 times
Turn ON relay
Wait 1 second
Turn OFF relay
Wait 1 second
ENDO
END
6. A push-button switch is connected to a microcontroller input ports. Also, an LED is
connected to an output port. It is required to flash the LED three times when the button is
pressed. Draw a flow chart to show how the program can be designed.
7. Write the PDL statements for exercise (6) above.
8. It is required to write a function to convert meters to inches. Draw a flow chart to show
how this function can be designed. Also, draw a flow chart to show how the function can
be called from a main program to convert 5m to inches.
9. Write the PDL statements for exercise (8) above.
10. A temperature sensor chip is connected to an input port of a microcontroller. At the same
time an LCD is connected to the output ports. Write a program to read the temperature
every minute and then display it on the LCD both in degrees Fahrenheit and in degrees
Centigrade.
11. Draw the flow chart equivalent of the following PDL:
BEGIN
Configure the output port
IF switch 1 is pressed THEN
Start the motor
ELSE IF switch 2 is pressed THEN
Start the pump
ELSE
Turn ON the LED
ENDIF
END