1. Flow Charts & Block Diagram
.
.

2. One Holder is
down
Return
One more cycle
Light
Sensor >
200
?
Yes
No

3. Get Position
Position
Even or
Odd ?
Sort array according
to positions
One Motor rotation
Re-assign positions
Calculate number
of rotations
Set direction =
Anticlockwise
Set direction =
Clockwise
Odd Even
Number
of
rotations
= 0 ?
Yes
No
END

4. For each holder in the
system array
Set NewPos =
(NO_HOLDERS*2)+1 -
NewPos
Calculate new positions
NewPos = Old +
(direction*displacement*2)
Position
Even or
Odd ?
Calculate new positions
NewPos = Old -
(direction*displacement*2)
Set NewPos =
(-1*NewPos)+1
NewPos
<= 0
?
NewPos
>
NO_HOL
DERS ?
END
Odd Even
Yes
Yes
No
No

5. A
Start
Is there
any
empty
holders?
END
Increase the number
of occupied holders
Align the holder ID to
the given user card
Save the holder as
occupied
Get the first empty
holder down
No
Yes

6. B
Start
Is there
any
Saved
cards ?
END
Save holder as empty
Get holder down
Wait for input
number
Install saved cards
NoYes
Remove aligned
holder from user ID
Decrease number of
occupied holders

7. Controller
LCD
screen
Keypad Buzzer RFID
Motor current
driver
Power
Supply
24V
Photo
resistor
Ethernet
Module
System of
holders
controlled
by Stepper
Motor