PIDflight Lap

This guide describes the process for configuring a 3DR 433/915Mhz telemetry module to use with PIDflight Lap timing devices.

To configure the 3DR telemtry modules you will use the Ground module to configure both it and the Air module. You will need the Air Module to be powered up for this.

By default the Ground module is set to 57600 baud rate. Both the Ground module and Air module need to have the serial speed, and some other settings tweaked before it's ready to use.

1. Open Serial Monitor, select 'No line ending' and baud rate '57600'.
2. Type +++ and press Send. The module should respond with OK.
3. Change line ending to 'Both NL & CR', type AT and press Send, the module should respond with another OK to verify the module is in command mode. Proceed to next step.

   AT
   OK

4. Type ATI5 to get list of S registers for the ground module to view the current settings.

   ATI5
   S0:FORMAT=25
   S1:SERIAL_SPEED=57
   S2:AIR_SPEED=64
   S3:NETID=25
   S4:TXPOWER=20
   S5:ECC=1
   S6:MAVLINK=1
   S7:OPPRESEND=1
   S8:MIN_FREQ=915000
   S9:MAX_FREQ=928000
   S10:NUM_CHANNELS=50
   S11:DUTY_CYCLE=100
   S12:LBT_RSSI=0
   S13:MANCHESTER=0
   S14:RTSCTS=0
   S15:MAX_WINDOW=131

5. Type RTI5 to get list of S registers for the air module.

   RTI5
   S0:FORMAT=25
   S1:SERIAL_SPEED=57
   S2:AIR_SPEED=64
   S3:NETID=25
   S4:TXPOWER=20
   S5:ECC=1
   S6:MAVLINK=1
   S7:OPPRESEND=1
   S8:MIN_FREQ=915000
   S9:MAX_FREQ=928000
   S10:NUM_CHANNELS=50
   S11:DUTY_CYCLE=100
   S12:LBT_RSSI=0
   S13:MANCHESTER=0
   S14:RTSCTS=0
   S15:MAX_WINDOW=131

6. Set the SERIAL_SPEED register (S1) to 115 for 115200 baud rate on both modules. Type ATS1=115 and RTS1=115.

   ATS1=115
   OK
   RTS1=115
   OK

7. Set the ECC register (S5) to off on both modules. Type ATS5=0 and RTS5=0.

   ATS5=0
   OK
   RTS5=0
   OK

8. Set the MAVLINK register (S6) to off on both modules to disable Mavlink framing. Type ATS6=0 and RTS6=0.

   ATS6=0
   OK
   RTS6=0
   OK

9. Set the OPPRESEND register (S7) to off on both modules. Type ATS7=0 and RTS7=0.

   ATS7=0
   OK
   RTS7=0
   OK

10. The final configuration for both modules should appear as the following.

    ATI5
    S0:FORMAT=25
    S1:SERIAL_SPEED=115
    S2:AIR_SPEED=64
    S3:NETID=25
    S4:TXPOWER=20
    S5:ECC=0
    S6:MAVLINK=0
    S7:OPPRESEND=0
    S8:MIN_FREQ=915000
    S9:MAX_FREQ=928000
    S10:NUM_CHANNELS=50
    S11:DUTY_CYCLE=100
    S12:LBT_RSSI=0
    S13:MANCHESTER=0
    S14:RTSCTS=0
    S15:MAX_WINDOW=131
    RTI5
    S0:FORMAT=25
    S1:SERIAL_SPEED=115
    S2:AIR_SPEED=64
    S3:NETID=25
    S4:TXPOWER=20
    S5:ECC=0
    S6:MAVLINK=0
    S7:OPPRESEND=0
    S8:MIN_FREQ=915000
    S9:MAX_FREQ=928000
    S10:NUM_CHANNELS=50
    S11:DUTY_CYCLE=100
    S12:LBT_RSSI=0
    S13:MANCHESTER=0
    S14:RTSCTS=0
    S15:MAX_WINDOW=131

11. Write the new changes to the EEPROM. Type AT&W and RT&W.

    AT&W
    OK
    RT&W
    OK

12. Done!