AIM: Programming of Raspberry Pi to control LEDs
APPARATUS: Raspberry Pi with Raspbian Pi OS, LEDs, Resistors, connecting wires, USB Keyboard, mouse LCD Monitor, HDMI to VGA converter, 5V Power Adapter.
CIRCUIT DIAGRAM:
Procedure:
1. The kit consists of Raspberry Pi 3B+, Power adapter, HDMI to VGA converter cable and PCB with LEDs connected and the 9 pin connector.
2. Connect the circuit as shown in the circuit above. Use Female to Female connecting wires to connect Raspberry Pi pins to the Led pins available on the PCB.
3. Run the program using “run” button in the IDE, it will ask you to save the file. If not saved before, save it with file name extension .py
4. You will observe the flashing of the LEDs after every two seconds duration. You can change the time duration by changing the time in seconds.
5. Now load the other programs, save with other name and observe the working according to the program.
Program 1: Toggling of all LEDs simultaneously
#
# Program for flashing all LEDs which are interfaced to Raspberry Pi
# pin numbers 8, 10, 16, 18, 22, 24, 26, 32 are used to connect LEDs
#
import RPi.GPIO as GPIO # import GPIO library
import time # import time library
GPIO.setmode(GPIO.BOARD) # set the BOARD with pin numbers
GPIO.setup(8, GPIO.OUT) # initialize pins as output
GPIO.setup(10, GPIO.OUT)
GPIO.setup(16, GPIO.OUT)
GPIO.setup(18, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)
GPIO.setup(26, GPIO.OUT)
GPIO.setup(32, GPIO.OUT)
GPIO.output(8, False) # initialize the pins as in LOW state (LED OFF)
GPIO.output(10, False)
GPIO.output(16, False)
GPIO.output(18, False)
GPIO.output(22, False)
GPIO.output(24, False)
GPIO.output(26, False)
GPIO.output(32, False)
while (True):
GPIO.output(8, True) # if the state is True (Logic HIGH), turn ON LED
GPIO.output(10, True)
GPIO.output(16, True)
GPIO.output(18, True)
GPIO.output(22,True)
GPIO.output(24,True)
GPIO.output(26,True)
GPIO.output(32,True)
print("LED ON") # Print the message on the console
time.sleep(2) # wait for time 2 sec
GPIO.output(8, False) # if the state is False (Logic LOW), turn OFF LED
GPIO.output(10, False)
GPIO.output(16, False)
GPIO.output(18, False)
GPIO.output(22, False)
GPIO.output(24, False)
GPIO.output(26, False)
GPIO.output(32, False)
print("LED OFF") # Print the message on the console
time.sleep(2) # wait for 2 sec
# repeats the procedure in the while LOOP for infinite iteration.
# To stop the program press STOP button on IDE.
------------------------------------------------------------------------------------------------------
Program 2: Flashing of LEDs Turn ON from left to right one by one and turn off from left to right one by one in sequence.
#
# Program to interface LED to Raspberry Pi and Flashing them IN- OUT and OUT-IN way.
#pin numbers 8, 10, 16, 18, 22, 24, 26, 32 are used to connect LEDs
#
import RPi.GPIO as GPIO # import GPIO library
import time # import time library
GPIO.setmode(GPIO.BOARD) # set the BOARD with pin numbers
GPIO.setup(8, GPIO.OUT) # initialize pins as output
GPIO.setup(10,GPIO.OUT)
GPIO.setup(16,GPIO.OUT)
GPIO.setup(18,GPIO.OUT)
GPIO.setup(22,GPIO.OUT)
GPIO.setup(24,GPIO.OUT)
GPIO.setup(26,GPIO.OUT)
GPIO.setup(32,GPIO.OUT)
GPIO.output(8,False)
GPIO.output(10,False) # initialize the pins as in LOW state (LED OFF)
GPIO.output(16,False)
GPIO.output(18,False)
GPIO.output(22,False)
GPIO.output(24,False)
GPIO.output(26,False)
GPIO.output(32,False)
while(True):
GPIO.output(8,True) # if the state is True (Logic HIGH), turn ON LED
time.sleep(0.2) # wait for 0.2 sec
GPIO.output(10,True)
time.sleep(0.2)
GPIO.output(16,True)
time.sleep(0.2)
GPIO.output(18,True)
time.sleep(0.2)
GPIO.output(22,True)
time.sleep(0.2)
GPIO.output(24,True)
time.sleep(0.2)
GPIO.output(26,True)
time.sleep(0.2)
GPIO.output(32,True)
time.sleep(0.2)
GPIO.output(8,False) # if the state is False (Logic LOW), turn OFF LED
time.sleep(0.2) # wait for 0.2 sec
GPIO.output(10,False)
time.sleep(0.2)
GPIO.output(16,False)
time.sleep(0.2)
GPIO.output(18,False)
time.sleep(0.2)
GPIO.output(22,False)
time.sleep(0.2)
GPIO.output(24,False)
time.sleep(0.2)
GPIO.output(26,False)
time.sleep(0.2)
GPIO.output(32,False)
time.sleep(0.2)
# repeats the procedure in the while LOOP for infinite iteration.
# To stop the program press STOP button on IDE.
-----------------------------------------------------------------------------------
Program 3: Flashing of LEDs Turn ON in sequence 1-8, 2-7, 3-6, 4-5 and afrom left to right one by one and turn off from left to right one by one in sequence.
# Program to interface LED to Raspberry Pi
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setup(8,GPIO.OUT)
GPIO.setup(10,GPIO.OUT)
GPIO.setup(16,GPIO.OUT)
GPIO.setup(18,GPIO.OUT)
GPIO.setup(22,GPIO.OUT)
GPIO.setup(24,GPIO.OUT)
GPIO.setup(26,GPIO.OUT)
GPIO.setup(32,GPIO.OUT)
GPIO.output(8,False)
GPIO.output(10,False)
GPIO.output(16,False)
GPIO.output(18,False)
GPIO.output(22,False)
GPIO.output(24,False)
GPIO.output(26,False)
GPIO.output(32,False)
while(True):
GPIO.output(10,False)
GPIO.output(26,False)
GPIO.output(8,True)
GPIO.output(32,True)
time.sleep(0.5)
GPIO.output(8,False)
GPIO.output(32,False)
GPIO.output(10,True)
GPIO.output(26,True)
time.sleep(0.5)
GPIO.output(10,False)
GPIO.output(26,False)
GPIO.output(16,True)
GPIO.output(24,True)
time.sleep(0.5)
GPIO.output(16,False)
GPIO.output(24,False)
GPIO.output(18,True)
GPIO.output(22,True)
time.sleep(0.5)
GPIO.output(18,False)
GPIO.output(22,False)
GPIO.output(16,True)
GPIO.output(24,True)
time.sleep(0.5)
GPIO.output(16,False)
GPIO.output(24,False)
GPIO.output(10,True)
GPIO.output(26,True)
time.sleep(0.5)
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