Electrical Subteam Members

Students

Alex Rozanov

Vaughn Thompson

Matthieu Dora

Henry Wagner

Mentors

Dave Burlone

Dean Smith

Christian Stoeckl

Dave Schoepe

Master Task List

High Priority

Determine mounting spots for the battery
Create fixture for mounting the battery
Design (in a modeling program) a new control board layout to fit all electronics
Test brightness of LED tape when mounted on a pipe.

Medium Priority

~~Put cables on new batteries (See Subtasks)~~Complete
Test batteries with power meter and record electronic results on wiki (See Subtasks)
Design signal lights ("want-it"/"got-it")
~~Choose encoder for Arm Axle~~ ~~2011_Encoders~~ Complete 1/23
Design photoelectric sensor (similar to Banner offerings)
Work with programming on line sensors calibrating, adjusting etc. (See Subtasks!)

Low Priority

Prep gyro - needs set of pins soldered to the board
Crimp PWM ends to flying leads of DT wheel encoders

Sub Task List

Control Board In Inventor

The current drive train design is almost complete in Inventor this means that we can start drawing in the control board.

Must have at least three different designs to be flexible with mechanical group
Must evaluate positives and negatives of any structural elements used to mount electronics
Think about cable routing and cable management.
Think about how hard/easy it is to work on at competition, and visibility of LED's for troubleshooting (cRio, Jaguars, spikes).
Should mount speed controller in an accessible spot (like on 2010/2009) robots
Work on centering battery

Check all Batteries:

~~The batteries should have the tape removed and crimps checked and redone if needed.~~(Completed 1/18)
Terminate tester with the appropriate leads
Test Batteries with tester, plot and save results electronically on the wiki (should be ongoing)

Experiment with Line Sensors:

Pull out a power supply and scope, find out how the sensors work, and test range and sensitivity.
~~Mock up on Thunderfoot for initial testing~~ (Completed 1/15)
Test under different lighting conditions but on same surface
~~Test orientation of sensor (in 90 degree increments)~~ (Completed 1/22) - Makes little to no difference

Measure Mach 1511 Polycarb

This is the thickness of the polycarb to use on the control board and order a sheet.

CAN Bus Minutia

Make two Serial to CAN converters
Make two CAN terminators
Make four CAN cables

Safety Light: Wire up the Orange Safety Light - Complete 1/15

Communication Signals

Plan and design human player communication lights.
Want-It Light(s)
Got-It Light
Need to test visibility

Motors: Inventory and test motors. - Complete 1/13

Links to Other Subteams' Important Stuff

2011:Robot IO Map

Robot Electromechanical Design Features

OUTPUTS

Drivetrain motors
Arm elevation motor
~~Arm unfold/extend~~ This is unnecessary, unfolding is a mechanical function ONLY
Gripper rollers
Minibot deployment release

INPUTS

Gyro
Drivetrain motors speed and direction
Arm angle
Line tracking sensors

ARM PLACEMENT ACCURACY Need to determine the required resolution (accuracy) of the arm angular sensor.

This is a very, very rough determintaion, based on some assumptions (because I didn't have the robot & arm dimensions). -Dave S

Placement accuracy required:

ubertube central hole is 12"
scoring peg foot is 2.75"
If perfectly centered, this leaves approx 4.5" gap between tube and scoring peg.
Let's cut this in half to have some safety margin, and say we need to place the tube within 2" during autonomous mode.

Sensor resolution required:

Fully extended arm reaches to 9.5' (114")
ASSUME that arm is pivoted at a point 48" above ground in the center of the robot, then the arm's length is about 68".
the circumference of the arc the arm traces is 427"
so 2"/427" times 360 degrees for a full circle gives about 1.7 degrees as corresponding to 2" in arm rotation out at the gripper.
To allow for some margin of error, let's say we need to sense the arm angle at least within 1.0 degree.

So need to choose a sensor with 1 degree of angular resolution or better.

IF use an analog sensor, cRio 9201 module is 12-bit ADC for a full scale input range of -10V to +10V. We would likely use less than its full range so we would not get its maximum resolution - the reference voltage for the ADC is internal and not user selectable.

edit: Generally, the SW team usually throws away the bottom two bits of ADC readings as it's likely noise

Robot Sensor Requirements

Drivetrain Sensors

US Digital E4P Rotary Encoder (2) - Directly coupled to gearboxes
Rockwell line following sensor (3+) - ~~Mounted as close to center as possible~~
Three in a line at the front of the bot, 1 inch off the floor (to the lens) center one fixed and the others adjustable from adjacent to 1 inch away.
Gyro (KOP)

Arm Sensors

Some Calculations (Arm Placement Accuracy) show that we need 1-2 degree tolerance on the sensor
If using a potentiometer we should fine 1% tolerance pots
If using encoders must use both A & B phase for maximum accuracy
Limit switches at extremes/home-position
Potentially have 2 arm sensors for redundancy
We decided to go with the E4P sensor instead of the E7P
The E4P would be able to get up to .5 of a degree of arm rotation accuracy which is above our goal
The E7P would be able to get .25 degrees of rotation, but is twice as expensive

Manipulator

Needs at least 1 "Got It" Sensor (maybe 2?)
Would be nice to make this sensor active low
We should impose the mechanical team to design a mechanical stop
Will drive the "Got It" Light

Motor Outputs

General Assumption: CAN Based Motor Controls

Drivetrain

2 x Jaguar - CIM

Arm

1 x Jaguar - CIM?

Manipulator

2 x Jaguar - Continuous Rotation Servo

Visual Feed Back

Want-It-Indicator

Used to relay to the human player what type of tube needs to be fed to the robot
Needs to be viewable from all angles
No breakables for this

Got-It-Indicator

Used to tell the robot drive team that the robot is in "good" possession of a tube
Needs to be viewable from all angles
Needs to be viewable from far distances
No breakables for this