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=Overview=

**State of limit switch.

**Sent when button is pressed or released. Switches are active low, so the value is 0 (LOW) when the button is pressed, 1 (HIGH) when the button is released.

**State of motor control relay.

**Sent when relay state changes. Relays are active low, so a value of 0 (LOW) means the relay is on, 1 (HIGH) means the relay is off.

**Sent when requested.

**First value is auto mode, 0 for "off", 1 for "on".

==Receiving==

They can receive 6 messages:

**Turns relay on or off.

**Relays are active low, so a value of 0 (LOW) means the relay is on, 1 (HIGH) means the relay is off.

Configuration messages. The following three messages change run-time behavior of a node in automatic mode:

**Sets automatic mode. 0 for "off", 1 for "on".

**Sets the threshold value for the lower limit of bullroarer travel. When in auto mode, a sensor reading larger than this value will trigger the relay to turn the motor back on and raise the bullroarer.

*''/br/1/timeout'', long integer, 0- max long int.

**Sets the amount of time the bullroarer waits at bottom before starting motor, the "rest time". Only works when in auto mode.

**Writes the current runtime configuration (auto, max, and timeout) to the bullroarer's EEPROM. This will save the current settings for next startup. Otherwise they are lost.

**Sends the current runtime configuration for the bullroarer to the host computer.