Added test sketches for Arduino and PC.
Working on Arduino sketch.
Added initial ping code to Arduino and PC sketches.
Changing project name.
Nil.
Changing Processing test sketch name.
Linked input from sensor sketch to "bouncing ball" display.  Tested OK.
Restructured folders.  Added test programs for SoftwareSerial on hub and
sensor.
Added LED blink to sensor for ATTiny standalone testing.
Fixed LED pin for ATTiny.
First working version of sensor and sensorharness for SoftwareSerial
Added NeoPixel test sketch
Added NeoPixel test to sensor harness.  Tested OK.
First version of revised sensor code. Not tested.
Sensor and harness tested OK.
Tidied up test sketches.  Not tested.
Moved processing to folder.
Test code moved to hub sketch.  Not tested.
Restructuring for multiple sensors.  Added ping and response timeouts.
More work needed to make cycle vs gap timeouts correct.