Update

Fixed the problem of rpi_ws281x library and starting the server without
interface

Code/Server/servo.py

@@ -27,9 +27,18 @@ class Servo:
 
 # Main program logic follows:
 if __name__ == '__main__':
+    print("Now servos will rotate to 90°.") 
+    print("If they have already been at 90°, nothing will be observed.")
+    print("Please keep the program running when installing the servos.")
+    print("After that, you can press ctrl-C to end the program.")
     pwm=Servo()
-    pwm.setServoPwm('0',90)
-    pwm.setServoPwm('1',90)
+    while True:
+        try :
+            pwm.setServoPwm('0',90)
+            pwm.setServoPwm('1',90)
+        except KeyboardInterrupt:
+            print ("\nEnd of program")
+            break
 
     
 

Code/setup.py

@@ -9,14 +9,10 @@ for x in range(1,4):
             flag=flag | 0x01
             break
 for x in range(1,4):
-    if os.system("sudo pip3 install rpi_ws281x") == 0:
+    if os.system("sudo apt-get install -y python3-dev python3-pyqt5 ") == 0:
         flag=flag | 0x02
         break
-for x in range(1,4):
-    if os.system("sudo apt-get install -y python3-dev python3-pyqt5 ") == 0:
-        flag=flag | 0x04
-        break
-if flag==0x07:
+if flag==0x03:
     print("\nNow the installation is successful.")
 else:
     print ("\nSome libraries have not been installed yet. Please run 'sudo python setup.py' again")