Robotics

1
Robotics

• Bluetooth example
• Presentations
• Lab building projects

2
Bluetooth

• and all communication protocols
• Subject to timing variability. Sends and receives
  done on digital schedule, not continuously
• Message transmission is not instantaneous

3
My example

• keybt
• Runs on master
• Loop Waits for touch sensor, NXT left arrow, or
  NXT right arrow
• When one is pressed, send BT 1, 2, or 3
• Displays number
• getmsg
• Runs on slave. Must be started first.
• Loop to receive BT numeric message
• Displays message

4
keybt
5
keybt
6
getmsg
7
Cautions

• Make sure sending and receiving same datatype, in
  this case number
• Also correct connection, correct mailbox. In this
  case, 1 (only connection) and 1.
• The nbr variable initialized and reset to zero is
  used to signal if something has been pressed AND
  what has been pressed.
• advantage of numbers
• comparing numbers built in
• There are text operations that can be downloaded
  from nxtasy http//nxtasy.org/2007/05/30/text-ma
  nipulation-nxt-g-blocks/

8
Suggestions

• (Do as I say, not as I just did)
• Make multiple block sections for display into
  MyBlocks
• Experiment with pauses. More or less may be
  better.
• ?

9
Building projects

• Do small experiments
• Write out plans (logic)
• Iterate