Technological subjects

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Technology

Robotics
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Irish Mini Sumo Robot Competition Explained
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• Educational Aims
• To develop student interest and expertise in the
  area of Applied Control through building
  autonomous Mini Sumo Robots and subsequently
  competing them against each other in both school
  based and national Mini Sumo Robot Tournaments.
• Students will develop skills in the following
  areas
• Design
• Material Processing
• Mechanisms
• Robotics
• PIC Control
• Mathematics
• GENIE PIC Programming Software

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1. Competition Overview

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What is Robot Sumo? Robot-Sumo is a sport in
which two robots attempt to push each other out
of a circle (in a similar fashion to the sport of
Sumo). The robots used in this competition are
often called Sumobots. The engineering
challenges are for the robot to find its opponent
(usually accomplished with infrared or
ultra-sonic sensors) and to push it out of the
flat arena. A robot should also avoid leaving the
arena, usually by means of a sensor that detects
the edge. The most common "weapon" used in a
Sumobot competition is an angled blade at the
front of the robot, usually tilted at about a 45
degree angle towards the back of the robot. This
blade may have an adjustable height for different
tactics.
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Sumo Robot Classes
There are four main classes of Sumo Robot.
Class Max Length (cm) Max Width (cm) Max Weight (grams) Max Height (cm)
Mega 20 20 3000 Unlimited
Mini 10 10 500 Unlimited
Micro 5 5 100 5
Nano 2.5 2.5 25 2.5
The Irish Schools Competition is currently only
for the Mini Sumo Robot.
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Mini Sumo Robot Competition Ring
Ring Name Ring Diameter Ring Height White Border Width Start Line Width Start Line Length Start Line From Center
Mini Sumo 77 cm 2.5 cm 2.5 cm 1 cm 10 cm 5cm
Schools should make a similar ring from sprayed
MDF etc to test their Mini Sumo Robots.
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Irish Mini Sumo Robot Competition

• A mini-sumo robot must be able to do the
  following
• Stay in the ring Survive
• Look for the opponent Hunt
• Aim at the opponent Target
• Push the opponent Attack

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State Description Actions
SURVIVE The robot enters this state when it detects the table edge using its LDR sensor(s) Its goal is to survive by not going off the table The robot rotates away from the sensor that sensed the edge to face back toward the centre of the table Rotate away from the line sensor that sensed the edge. Switch back to HUNT state when rotation is complete.
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State Description Actions
HUNT The robot is not at the edge of the table but hasnt sensed the opponent The robot moves around in a set pattern so its infra red range sensor(s) will sweep across the ring in the hope of sensing the opponent Switch to SURVIVE state if table edge is detected Switch to TARGET state if range sensors indicate an object ahead Otherwise, drive in the set pattern
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State Description Actions
TARGET The opponent has been sensed ahead using the infra red sensor(s) Aim the robot to face the opponent directly Switch to SURVIVE state if ring edge detected If still sensing opponent, but opponent is not directly ahead, turn slightly to aim at opponent If opponent is directly ahead and close switch to ATTACK state If opponent is ahead but not close, move straight forward Otherwise, switch to HUNT state
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State Description Actions
ATTACK The opponent has been found and aiming is complete. Drive straight ahead at full power to push the opponent off the table. 1. Switch to SURVIVE state if table edge detected. 2. Otherwise, drive straight forward at full power.
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Mini Sumo Robot Examples
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This is a SolidWorks render of a sample Mini Sumo
Robot. Instructions for the manufacture of this
robot are available in folder 3.Sample Mini Sumo
Robot Manufacture
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Rear view of the SolidWorks render.
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Required Components for Irish Mini Sumo Robot
Competition
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• In order to minimise costs for and ensure
  fairness and equality during competition,
  specifications for the following main components
  have been created
• Motors
• PIC Control Board
• Edge Sensing LDR
• Infra Red Distance Sensor

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Specified Motors
This economy motorised gearbox is fitted with a 3
to 12V DC motor. The output shaft is 5.5mm
diameter and 9mm long with 2 flats. It is
available from Rapid Electronics. Click on the
link below for details.
http//www.rapidonline.com/Electrical-Power/Fans-M
otors/Gearboxes/1201-Inline-motor-and-gearbox/817
28/kw/motor
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Specified Motors
A robust worm-drive gearbox powered by an MM28
motor (included). Most suitable for applications
where an easy to fit, high torque output is
required. Ideal for student based projects
including robots and buggies Click on the link
below for details.
http//www.rapidonline.com/Electrical-Power/Fans-M
otors/Gearboxes/Worm-drive-gearbox-with-motor/6448
3/kw/Motorandgearbox13a220
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PIC Control Board
The GENIE E18 Motor Board must be used to control
the Mini Sumo Robot. A kit containing all
necessary components to build this board can be
purchased at http//www.rapidonline.com/sku/Elect
ronic-Components/Integrated-Circuits/Genie/GENIE-1
8-pin-microcontroller-system-kits/124896/13-6016
The required GENIE Design studio software can
be downloaded free from the GENIE website
at http//www.genieonline.com/ The folder
labelled 4. Using GENIE Design Studio to Program
a Mini Sumo Robot contains information on using
the software along with example videos of student
Mini Sumo Robots in action.
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GENIE E18 Motor Board
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Edge Sensing LDRs
A compact low cost cadmium sulphide light
dependent resistor (LDR) housed in a small
package. Click on the link below for details of
this or similar LDRs
http//www.rapidonline.com/Electronic-Components/O
ptoelectronics/Photodetectors/Miniature-light-depe
ndent-resistor/34796/kw/ldr
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Infra Red Distance Sensor
The GP2Y0A21 Sharp distance sensor is a great way
to add obstacle avoidance or motion sensing to
your robot or any other project. With built in
emitter and receivers, a detection range of 10 to
80cm and an analogue voltage indicating the
distance, this sensor is very easy to use.
Click on the link below for details.
http//www.pololu.com/catalog/product/136/pictures

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If any school is interested in entering the 2012
Inaugural Irish Mini Sumo Robot Tournament which
will be held in January 2012 please
contact Declan Askin St. Geralds
College Castlebar Co. Mayo 087 4181690 declan.aski
n_at_stgeraldscollege.com www.geralds.ie