Install the QTI Line Sensors

Parts:

• (1) SumoBot, built up at least through the end of the Add Cables for Front QTI Sensors page
• (2) QTI line sensors
• (2) #4-40 1/2″ long pan-head machine screws
• (2) 1/8″ Nylon spacer
• (2) 1/16″ Nylon spacer

Procedure

• Position the parts on each screw in this order:
• QTI with parts facing the same direction as the screw’s head
• 1/16” nylon washer
• 1/8″ nylon washer.

• Connect each screw (with its QTI and washers) to a front standoff (by the plow).
• Make sure the pins of each QTI point inward -toward the slot where you just inserted the cables.

• Connect the cables you fed through the chassis to each QTI.
• Make sure that each cable’s:
  • White wire is connected to the QTI’s W pin
  • Red wire is connected to the QTI’s R pin
  • Black wire is connected to the QTI’s B pin
• Set the SumoBot face down on the table with its underside facing toward you, and identify the left and right QTIs.  
• Follow the cable from the left QTI to its other end, and mark it L with masking tape.
• Repeat for the right cable.

• Connect the QTI marked L to the P13 header and the QTI marked R to the P14 header.  
• Make sure each cable’s:
  • Black wire is connect to the pin labeled GND
  • Red wire is connected to the pin with a label that begins with P (like P13 and P14).
  • White wire is connected to the pin labeled 5V.

• Remove the L and R labels from the QTI cables.
• Put the batteries back into the battery holder.
• Connect the battery power plug to the barrel jack.