• up = 0
• down = 0
• double = 0
• buttonone = alert elevator to button one
• buttontwo = alert elevator to button two
• button three = alert elevator to button three
• upbutton = alert elevator to go up
• downbutton = alert elevator to go down

Step 1: Standby

Move elevator to floor one if no button has been pressed.

Step 2: Check if ‘upbutton’ or ‘downbutton’ has been pressed.

if ‘upbutton’ is pressed:

go to the floor where the button has been pressed, proceed to stage 3

up = 1

if ‘downbutton’ is pressed:

go to the floor where the button has been pressed, proceed to stage 3

down = 1

Step 3

• Stop on determined floor, open doors.
• Wait 10 seconds
• If doorway detects motion, repeat previous action.
• If no doorway movement, wait 10 seconds, close door.
• If weight is not detected, move to step 1.
• If weight is detected, Proceed to step 4
• Proceed to step 4.

Step 4

Check what floor the elevator is on.

• If Elevator is on floor ONE, proceed to step 5A
• If Elevator is on floor TWO, proceed to step 5B
• If Elevator is on floor THREE, proceed to step 5C

Step 5A

• Check for button press
• Repeat until button is pressed
• If button is ‘buttonone’, repeat stage 3.
• If button is ‘buttontwo’, move elevator up ONE floor.
• If button is ‘buttonthree’ move elevator up TWO floors.
• If ‘buttontwo’ and ‘buttonthree’ are pressed, move up ONE FLOOR. Add 1 to double
• Proceed to step 6

Step 5B

• Check for button press
• Repeat until button is pressed
• If button is ‘buttontwo’, repeat stage 3.
• If button is ‘buttonthree’, move elevator up ONE floor.
• If button is ‘buttonone’ move elevator down ONE floor.
• If ‘buttonone’ and ‘buttonthree’ are pressed, move up ONE FLOOR. Add 1 to double
• Proceed to step 6

Step 5C:

• Check for button press
• Repeat until button is pressed
• If button is ‘buttonthree’, repeat stage 3.
• If button is ‘buttontwo’, move elevator down ONE floor.
• If button is ‘buttonone’ move elevator down TWO floors.
• If ‘buttonone’ and ‘buttontwo’ are pressed, move down ONE FLOOR. Add 1 to double
• Proceed to step 6

Step 6:

• Open Doors
• Wait 5 seconds
• Check if double = 1
• If double = 1 AND up = 1, move elevator up ONE floor. Remove 1 to double, repeat step 6.
• If double = 1 AND down = 1, move elevator down ONE floor. Remove 1 to double, repeat step 6.
• If double = 0, reduce up and down to 0, wait 5 seconds.
• Proceed to step 7

Step 7:

Check if motion is in door well.

If no motion OR weight in elevator for 15 seconds, close doors, wait 4 minutes, repeat stage 1.

If weight or motion detected, repeat stage 4.