Robot Bumpers Instructable

I have decided to create an instructable that demonstrates how to create the Robot Bumpers and how to place them on the Battery-Controlled Robot. Firstly, you want to ensure that you have the wires connected in the right places. The circuit will not work otherwise. Secondly, you want to ensure that you have one of the wires connected to the VDD (positive) and the other wires connected to the VSS (negative). Lastly, you want to ensure that you connect both of these wires to the tin foil. The very last step that you have to do is ensure that the tin foil is connected to the bumpers.

Supplies:

The supplies that were used to create this Instructable were the following:

  • Two Sticks
  • Tin foil
  • 3 Wires

Step 1: Placing the Foil on the Sticks

Place the two sticks on the back of the bumper, ensuring that both sticks are covered with tin foil. The best option to ensure that both sticks stay on the back of the robot would be applying a small piece of adhesive tape.

Step 2: Connecting the Wires

In order for your circuit to work, you need to be able to connect the three wires from the VDD and VSS to the tin foil-covered sticks.

Step 3: Connecting All the Wires Into One

Lastly, in order to get all of the wires onto the bumper to start working, wrap them with tin foil and press them onto the foil-covered sticks. When pressed, the current from the wires caused the robot to move.

Step 4: Watch It Go!

When you press all three wires to the bumpers, the car should start moving. The next step displays the code that was required for this to work. The program that was used for this process is called "Basic Stamp Editor".

Step 5: The Code for Programming the Robot

In order for this robot to move, it needs to have the following code:

' {$STAMP BS2}
' {$PBASIC 2.5}

LBump PIN 11

RBump PIN 10

LMOTOR PIN 15

RMOTOR PIN 14

RFast CON 650

LFast CON 850

RSlow CON 700

LSLOW CON 800

MStop CON 750

RFastRev CON 850

LFastRev CON 650

RSlowRev CON 800

LSlowRev CON 700

MLoopC VAR Word 'For..Next Variable up to approximately 65000

DO

GOSUB Forwardfast 'go forward

IF IN10 = 0 THEN ' if the two wires in input 10 are pressed then turn left

GOSUB TurnLeft90

ELSEIF IN11 = 0 THEN 'If two wires in input 11 are pressed, then turn right

GOSUB TurnRight90

ENDIF

LOOP

TurnRight90:

' Subprocedure to Turn 90deg Right

'**********************************************************

HIGH 1

LOW 0

FOR MLoopC = 1 TO 22

PULSOUT LMOTOR, LfastRev 'move forward one pulse

PULSOUT RMOTOR, Rfast ' using pins and constants

PAUSE 20

' 20mS allows robot to move ' before NEXT pulse

NEXT

RETURN

'*********************************************************

TurnLeft90:

' Subprocedure to Turn 90deg Right

'********************************************************

HIGH 0

LOW 1

FOR MLoopC = 1 TO 22

PULSOUT LMOTOR, Lfast 'move forward one pulse

PULSOUT RMOTOR, RfastRev ' using pins and constants

PAUSE 20 ' 20mS allows robot to move ' before NEXT pulse

NEXT

RETURN

'***********************************************************

ForwardFast:

' Subprocedure to move the robot forward one square fast

'**********************************************************

FOR MLoopC = 1 TO 70

PULSOUT LMOTOR,

LFast 'PULSOUT

RMOTOR = RFast

PAUSE 20

NEXT

RETURN

This should allow the robot to move when pressed :)

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