PARTS Mini-Sumo Robot Kit: Final Assembly

Connect the Proximity Sensors

If you are using the sensor board that comes with the Mark II kit, follow these instructions:

Cut a 4" length of the 4 conductor ribbon cable:

Note: the wire in your kit may have different colors; just use the colors to keep track of which wire goes where.

There were mistakes in the instructions below. The corrections are in white bold lettering.

Separate the wires for approximately 0.5" in from each end, and strip off approximately 1/8" of insulation from the ends of each wire. Solder the wire in place as follows:

  1. On the sensor board, solder the green wire in -, red in +, black in L (unlabelled on some boards), and white in R, with the wires entering the holes on the board from underneath.
  2. NOTE: for kits number 1-26, you need to solder 120 ohm resistors in series with L and R to limit current in to the sensor's outputs if the Basic Stamp is programmed by mistake to drive out on those signals; see the PDF version of the instructions for details
  3. On the main board, solder the green wire to the - hole on IODR (the center hole), the red in the + hole of IODR, the black in the square hole of IODL, and the white in the square hole of IODR
  4. When the main board and sensor board are attached as described below, route the ribbon cable out of the way of the piezo speaker, LEDs, and I/O pins.

If you are using the Sharp GP2D15 sensors, follow these instructionrs:

The IODL and IODR connectors are soldered to the circuit board in the IODL and IODR holes. The red wire is positive, the black wire is ground, and the yellow wire is the signal. The signal wire goes in the square hole, the ground goes in the center hole, and the positive goes in the + hole.

Attach the Main Board

If you are using the sensor board, attach the circuit board to the four stand-offs with two 4-40 pan head screws in the back and two 3/16" male-female stand-offs in the front. Tighten the four screws on the bottom and the two screws and two stand-offs on the top.

If you are using Sharp GP2D15 sensors, attach the circuit board to the four stand-offs using the four 4-40 pan head screws in all four corners. The two 3/16" female stand-offs are not needed.

Using the last piece of double stick tape, attach the battery holder to the bottom of the chassis. The wires should be at the right rear corner of the robot, looking at it as if you were driving a car. The front edge of the battery holder should be 1/8" behind the bend in front of the chassis. Tape the wires to the right rear aluminum stand-off with electrical tape.

Attach the Sensor Board

If you are using the sensor board, attach the sensor board with the two 4-40 pan head screws to the top of the 3/16" standoffs. The IS471F sensors and IR LEDs should be pointing forward.

Weight Limits and Size Limits

The OMSI mini sumo robot when completed weighs about 320 grams. The mini sumo competition allows robots to weigh up to 500 grams. Add more weight to give the robot better traction. Tip: place the weight towards the front to help hold the scoop down.

All Mini-Sumo robots must be equal to or less than 10 cm square; they can be any height. Ten centimeters is close to 4", but not quite. It's slightly less than 3 15/16". When your robot is checked in the day of the competition, it will be weighed and placed within a 10cm by 10cm box; if it fits and does not weigh too much, you are ready to complete. If it is too big or heavy, you can't.

You can make a practice ring by using thick black poster board and paint or tape a one inch white edge. The regulation mini sumo ring is 77 cm in diameter and is covered with a layer of black rubber.

Next Step

  last updated 3/18/2001