aulaprokeypad.py

import RPi.GPIO as GPIO
import time
import serial

L1 = 25
L2 = 8
L3 = 7
L4 = 1


C1 = 16
C2 = 20
C3 = 21

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)

GPIO.setup(L1, GPIO.OUT)
GPIO.setup(L2, GPIO.OUT)
GPIO.setup(L3, GPIO.OUT)
GPIO.setup(L4, GPIO.OUT)

# Make sure to configure the input pins to use the internal pull-down resistors

GPIO.setup(C1, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(C2, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(C3, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
ch1= ["1","2","3"]
ch2= ["4","5","6"]
ch3= ["7","8","9"]
ch4= ["*","0","#"]
p=0
ser = serial.Serial(        
               port='/dev/ttyS0',
               baudrate = 921600,
               parity=serial.PARITY_NONE,
               stopbits=serial.STOPBITS_ONE,
               bytesize=serial.EIGHTBITS,
               timeout=1
           )

print(ser.name)
ser.write ('\r'.encode())
time.sleep(4) 
ser.write ('ping'.encode())
ser.write ('\r'.encode())
x=ser.read(3000)
time.sleep(10)
print(x)
def readLine(line, characters):
    global p
    GPIO.output(line, GPIO.HIGH)
    if(GPIO.input(C1) == 1):
        print(characters[0])
        p=characters[0]
        
    if(GPIO.input(C2) == 1):
        print(characters[1])
        p=characters[1]
        
    if(GPIO.input(C3) == 1):
        print(characters[2])
        p=characters[2]
        
    GPIO.output(line, GPIO.LOW)
    return p
    

try:
    while True:
        
        readLine(L1, ch1)
        if(p =="1"):
            print("red")
            ser.write ('Color red 90)'.encode())
            ser.write ('\r'.encode())
        elif(p=="2"):
            print("blue")
            ser.write ('Color blue 90)'.encode())
            ser.write ('\r'.encode())
        elif(p=="3"):
            print("green")
            ser.write ('Color green 90)'.encode())
            ser.write ('\r'.encode())
        readLine(L2, ch2)
        if(p =="4"):
            print("yellow")
            
            ser.write ('Color yellow 90)'.encode())
            ser.write ('\r'.encode())
        elif(p=="5"):
            print("cyan")
            ser.write ('Color cyan 90)'.encode())
            ser.write ('\r'.encode())
        elif(p=="6"):
            print("magenta")
            ser.write ('Color magenta 90)'.encode())
            ser.write ('\r'.encode())
        readLine(L3, ch3)
        if(p =="7"):
            print("white")
            ser.write ('on 90)'.encode())
            ser.write ('\r'.encode())
        elif(p=="8"):
            print("black")
            ser.write ('off'.encode())
            ser.write ('\r'.encode())
        elif(p=="9"):
            print("all")
            ser.write ('Sweep fine 3000 3'.encode())
            ser.write ('\r'.encode())
            
        readLine(L4, ch4)
        time.sleep(0.1)
except KeyboardInterrupt:
    print("\nApplication stopped!")