Daily Knowledge

1. Disconnect the Sun SPOT from the USB cable 2. Kill all the ant and java processes listening on the port 3. Hold the control button in for a few seconds until a double red flash indicates that the Sun SPOT has powered down (NB doing this *after* disconnecting). 4. Type this command at a command prompt: ant -Dport=xxx upgrade where xxx is the port name 5. Plug it in as soon as the ant script starts to complain that the port isn't available. *Don't* push the reset button: this isn't necessary and may confuse. 

Problem: Some spots is unable to deepsleep Cause: some spot properties prevent from deep sleep Solution: spot.mesh.enable = false

https://www.sunspotworld.com/forums/viewtopic.php?p=8064&sid=b80a20f95ee74e2e3826834f25d542a6 https://www.sunspotworld.com/forums/viewtopic.php?t=306&highlight=energy http://www.sunspotworld.com/docs/Orange/javadoc/com/sun/spot/peripheral/IPowerController.html#getVbatt()

Java Concurrency Constructs What is the difference between sleep(), wait() and suspend()? wait(), sleep(int) and InterruptedException The notifyAll and wait Methods Using the notifyAll and wait Methods 

Problem: I got

Problem: Method "thresholdExceeded" always works even though we didn't move the spot or move the spot when it is in deepsleep. Cause: I suppose that the events occurred when we do move and wait for sending the messages when the receiver is available. Solution: Disable ThresholdEvent before starting in deepsleep mode -- accel.enableThresholdEvents(IAccelerometer3D.ALL_AXES, false);