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Robot Troubleshooting
Posted: Nov 18, 2008• Disconnect the 9V battery during testing. Use a Heathkit Digital Experimenter (HDE) to power your bot. The Heathkit Digital Experimenter is the blue box with 4 LED's.
• First wire 5V and GND and 4 LED's from your HDE directly to your PIC only with the PIC is in place on your bot. Look for the sequence 1010, 0101, etc. on your LED's. Does it work?
• Next move the 5V and GND from your HDE to the input of your voltage regulator. Do not connect the H-Bridge yet. Do you still see the correct sequence on the 4 LED’s of your HDE?
• Now connect the +12V line from the HDE to the VCC2 connection of the H-Bridge. Also interface the PIC to the H-Bridge. Do the motors turn?
• If the motors changes direction without input from the bumper/whisker switches then check the code and 330 Ohm resistor configurations. You may have to use 5V instead of GND for one side of these resistors. Does the bot move forward?
• Swap the 4 wires to the 2 motors around until the bot moves forward and turns to the left if the right bumper switch is pressed.
• Now replace the HDE with a 9V battery. If the bot stalls and then starts going forward again when a switch is presses then use one 9V battery for VCC2 on the H-Bridge and connect a different 9V battery to your voltage regulator.
Exam III
Posted: Nov 6, 2008
Review Sheet
Operational Amplifier Electrocardiogram
Posted: Nov 2, 2008
Homework 5 Help
Posted: Sep 30, 2008Part 1
Part 2
Free Circuit Software
Posted: Sep 25, 2008
http://www.expresspcb.com
Homework 4
Posted: Sep 17, 2008
Homework 3
Posted: Sep 17, 2008
Circuit Construction - Measuring Voltage and Current
Posted: Sep 4, 2008
Homework 1 - Page 1 and 2
Posted: Aug 28, 2008Video Help: http://www.youtube.com/watch?v=jlYMXttAZNg
Homework 1 - Page 3
Posted: Aug 27, 2008
Click on the image above to play.
Also, the computers in the PRC and Room 315 can also run the simulations.
MIT Physics Lectures
Posted: Aug 20, 2008This is a great set of video lectures from MIT on Electricity and Magnetism.
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