1. Bluetooth example Presentations Lab: building projects
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 getmsg 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:

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