This project is for controlling a ham radio "fox" for a "fox-hunt".
The fox will persist of an arduino uno + a DFrobot sim808 gsm/gps shield. The shield is both for receiving a time signal and for remote control of the fox.
The signal that is transmitted, is build like this:
- Call signal
- 2 extra fox ID characters
- Bearing signal
- 4 x fox ID character
- Bearing signal
- Call signal
- 2 extra fox ID characters
The following SMS commands are supported (commands are case-insensitive)
STATUS
Returns a status message
ENABLETX
Enable transmission. Transmission is allowed. Enable/disable tx is a master-switch for turning transmission of on.
DISABLETX
Disable transmission. No transmission is allowed
ENSCHED
Enable schedule. If enabled the fox will only transmit within the allowed schedule / timeslot.
DISCHED
Disable schedule. If disabled the fox will transmit with no consideration to configured schedule/timeslot.
PING
Sends 3 bearing signals, each lasting 15 seconds
I:
Sets the transmission interval (5 and 10 are allowed). Eg. I:5 to set 5 minute interval
A:
Sets the allowed transmission timeslot/schedule. A:- Eg. A:0800-2230 configures the fox to not transmit before 08:00 and not after 22:30.
Allowed timeslot/schedule can not cross midnight. Please note that all times are in UTC.
DIT:
Sets the dit/dot length in milliseconds. Allowed interval is 20-140 (inclusive).
Eg. DIT:120 sets the ditlength to 120 milliseconds
FOX:
Sets the fox number. 0-7 are arllowed (both inclusive).
Eg. FOX:4 sets the foxnumber to 4
The status message contains these elements:
- Fox: fox number/fox letter
- TX: Transmission on/off
- Dit: (it-length / dot-length
- T: Local time in UTC
- Loc: location latitude,longitude
- Int: transmission interval in minutes (5/10)
- Period: period the fox is allowed to transmit (eg 0800-2200)