Northwestern Design Competition

DC2013

Spring Quarter Schedule

Workshop 6 - H-Bridges, DC motor control, wheel sensing
- Wed, 4/3/2013, 6pm in mechatronics lab
- workshop6.c - drive a DC motor using PWM with an h-bridge and sense its position with a reflectance sensor
- How to use an h-bridge and a DC motor
- Encoder template

Milestone 6 - Wheel control
- Meeting in the mechatronics lab at 6pm 4/17
- Demo due by 4/17/2013
- Press the USER button, and the wheel rotates 180 degrees

Milestone 7 - Complete chassis
- How to design parts that can be 3D printed
- Demo due by 4/24/2013
- Demo your chassis

Milestone 8 - Driving and sensing the world
- Demo due by 5/1/2013
- Demo your robot driving around the arena and sensing things

Milestone 9 - Identify prey and drive towards them
- Demo due by 5/8/2013
- Demo your robot chasing Prey

Milestone 10 - Operational robot, demo for E-Week
- Demo due by 5/15/2013, demo at E-Week in Tech lobby
- Show how your robot works

COMPETITION!!!!
- 5/18/2013, Noon in the machine shop

Useful things:

Arena and breakout board
- Breakout board EAGLE files

NU32
- Download: MPLAB X IDE and MPLAB XC32 Compiler from http://www.microchip.com/pagehandler/en-us/family/mplabx/#downloads
- Download: FTDI Drivers from http://www.ftdichip.com/Drivers/VCP.htm
- Download: NU32_Utility from NU32:_Software_to_Install
NU32 from 2012
- We have a lot of left over boards from 2012 but you have to use NU32_Utility_v5 from NU32:_Software_to_Install
- and NU32_2012.c, NU32_2012.h instead of NU32.c and NU32.h

Winter 2013 Schedule

Workshop 1 - Prey robot deconstruction
- Tue, 1/15/2013, 6pm, Ford B100

Milestone 1 - Prey robot -> Demobot
- Due by Wed, 1/23/2013
- Show off your Demobot, made from a deconstructed Prey robot DONE!

Workshop 2 - Programming the PIC32
- Begin Wed, 1/23/2013, meeting in the Mechatronics lab at 6pm
- How to program the PIC32 on the NU32
- Sample code - NU32test.hex, SimplePIC.c, NU32bootloaded.ld, talkingPIC.c, NU32.c, NU32.h

Milestone 2 - Programming the PIC32
- Due by Wed, 1/30/2013
- Code Template: DC2013_Milestone2.c, NU32.c, NU32.h, NU32bootloaded.ld
- Complete the assignment here: DC2013milestone2.pdf DONE!

Workshop 3 - Programming the PIC32
- Begin Wed, 1/30/2013, meeting in the Mechatronics lab at 6pm
- How to program the PIC32 on the NU32, sensors and actuators, soldering
- Sample code - DC2013_milestone3.c

Milestone 3 - Programming the PIC32, sensors and actuators
- Due by Wed, 2/6/2013
- Potentiometers, phototransistors, RC servos, ultrasonic distance sensors
- Complete the assignment here: DC2013milestone3.pdf DONE!

Workshop 4 - Using the laser cutter
- Begin Wed, 2/6/2013
- How to design parts that can be made on the laser cutter

Milestone 4 - Laser cutter training
- Due By Wed, 2/20/2013
- Get trained on the laser cutter
- Design and build a robot gripper or mechanism DONE!

Workshop 5 - RC servo and Laser detection
- Begin Wed, 2/13/2013, at 6pm in the mechatronics lab
- How to use a laser to detect retroreflective tape
- How to buffer and analyse data
- Combining the laser and RC servo to make a moving sensor
- workshop5.dxf - parts that mount the laser, sensors and servo for reference
- workshop5.c - sweep the servo when the user button is pressed, save the data to an array

Milestone 5 - Target hunting
- Due by Wed, 2/20/2013
- Mount the laser on the servo
- Sweep the laser, find the target, and point at it DONE!

Reading week 6/11-5, finals week 6/18-22, break 3/25-29

DC2012

Scale arena:

Dimensions of the arena for 2012

Equipment

NU32, USB cable, 6V power supply
2 drive motors, 2 motor mounts, 2 wheels
large and small RC servos
red and IR lasers
12"x24"x0.118" clear acrylic sheets
AA batteries and packs

PCB

The PCB breakout for DC2012

Schematic of PCB for 2012

Use the straight cut sheet metal cutter to slice up the PCB

Like this

So that you separate all the boards

Use female header pins to attach the NU32. The headers come is sets of 20 pins, so you will have to cut one up.

Attach lasers with hot glue

Note the orientation of the LED an phototransistor, they are polarized!

Workshop 1, Wednesday 1/18 5:30-7pm Tech L221, makeup Thursday 1/19 9-11am Mechatronics Lab

How to program in MPLABX
How to use the bootloader to put code on the NU32
Digital output I/O (read a button and flash an LED)
Analog input
PWM output
Sample code: Sample code for Workshop 1

Milestone 1, due by 1/27

If a pushbutton is pressed, read the value of a potentiometer and change the brightness of an LED to the corresponding value with PWM

Workshop 2, Thursday 2/9 6-7pm Tech L221, makeup Friday 2/10 9-11am Mechatronics Lab

Optical isolation for motors and RC servos
Powering a motor with an h-bridge
Writing to the 16x2 character LCD
Laser detection of retroreflective tape / Optical line detection
2 1/2D design

Milestone 2, Due week of Feb 27

Optically isolate a motor
Read a potentiometer and write its voltage to the LCD
Control the motor velocity based on the potentiometer reading
Control an RC servo
Detect a 3/4" wide black line on white paper with a phototransistor and LED

Laser cutting Workshop, Week of Apr 2

Laser cutting
2.5D design
Making a chassis, mounting motors and sensors

Chassis Milestone, Due Apr 13

Demonstrate a robot chassis that can drive around the arena, bonus points for following a line, detecting and moving towards the moving goals, and detecting and moving towards a crate

Midterm Milestone, Due Apr 30 / May 1 / May 2

Demonstrate some strategy - from the starting position, go get a crate and bring to back towards the goal

Pre-competition Milestone, Due May 9

Demonstrate some advanced strategy - score several points

Competition May 19!

DC2011

Milestone 1

On a button press, read the value of a potentiometer and change the brightness of an LED accordingly using PWM. Note: Do not use an h-bridge or motor as previously assigned.
Due before Workshop 2 on Wed, 2/9.
Sample code from Workshop 1

Milestone 2

Due before Workshop 3 on Wed, 2/23.
Goals:
- Use code from NU32v2: Nokia 5110 LCD and NU32v2: Analog Input to read a potentiometer and print the voltage to the Nokia 5110
- Optically isolate a motor and control its velocity based on the potentiometer reading
- Do 1 of the following:
  - Mount a phototransistor to a laser and detect a cake OR
  - Detect a line of electrical tape on white paper with an optoreflector
Datasheets
- HBridge_L293D.pdf - H-bridge for driving a DC motor
- Optocoupler_A847.pdf - Optocoupler to optically isolate your H-bridge
- HexInverter_74HC04.pdf - Inverting chip to digitize optocoupler output
- Optoreflector_OPB740.pdf - Optoreflector to detect lines or color
- Optoreflector_QRE1113.pdf - Optoreflector to detect lines or color
- Phototransistor_SFH310.pdf - Phototransistor to detect lines, color, or laser reflections
Notes
- DC2011_WS2_OpticalIsolation.pdf - How to optically isolate an h-bridge and servo motor using the A847 and 74HC04
- DC2011_WS2_OpticalSensors.pdf - How to use the SFH310 to detect a cake and use the OPB740 or QRE1113 for line following
- DC2011_WS2_Code.zip - Example code for the NU32v2 that will:
  - Control a DC motor hooked up to an optically isolated h-bridge, and control an optically isolated RC servo motor
  - Respond to serial commands to control the motors, write to the Nokia 5110, and read two analog signals

Milestone 4

Due before Wed, 3/16
Finish laser training, at least one person per team
Construct a prototype chassis for your robot
Do one of the following:
- Follow part of the line on the 36" x 96" printout of this pdf
- Detect a cake somewhere on the floor and drive to it

Breakout Boards

Image of the breakout boards
Circuit schematic of the breakout boards
This board contains:
- A spot to plug in the NU32v2 with some prototyping area
- The optical isolation circuit with some prototyping area, the same size as the NU32v2 breakout board so it can be stacked on top
- 8 SFH310 with LED breakout boards
- 4 SFH310 with laser diode breakout boards
- 1 LIS352AX accelerometer breakout board
- 1 LSM303DHL tilt-compensated compass breakout board
- 1 LPY550AL gyroscope breakout board
- 1 LS7366R encoder decoder breakout board
- 1 TCS3103 color sensor breakout board
How to use the boards:
- Solder female header pins to the NU32v2 Breakout Board so that you can plug in and remove your NU32v2
- Solder sockets to the Optically Isolated Motor Board so you can remove burnt out chips
- The LED and Laser Phototransistor breakout boards will make it easier to attach wires to the sensors
- You can stack the NU32v2 breakout board with the Optically Isolated board