Lemon 8-Channel Receiver + Satellite (Failsafe with UART)

 Receiver Schematic for further development.

Secondary Sources

8 Channels Operating Instructions

Binding:

1) Plug bind plug to the receiver.

2) Provide power to the unit.

3) Enable bind mode in transmitter and ensure distance separation of 2 meters from receiver.

4) Remove bind plug.

Failsafe Enable:

1) Plug bind plug to the receiver.

2) Provide power to the unit.

3) Plug the side pushbutton for memorize current position in Failsafe mode.

4) Green light will turn on at the bottom of the receiver to indicate Failsafe is successfully enabled.

5) Remove bind plug.

Failsafe Disable:

1) Rebind the receiver without pressing the side pushbutton will disable the Failsafe mode.

2) Green light off indicates Failsafe disabled.

For example: if all channels are centered except throttle shutdown and AUX is maximized, the UART should output the following.

<0x13><DEC(255)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><DEC(127)><0x13>

More about failsafe

For Lemon Rx 8 channels receiver, failsafe is available for all channels and some user may found it useful (for robotics application or UAV).

When bind plug is still plugged after successful binding, pressing the mem. button will cause the receiver to memorize all channels settings at the time the button is pressed for use in failsafe. If the failsafe is enabled correctly, green light should be on at the bottom of receiver. Press mem. button again while bind plug is plugged will cause the green light to turn off. This indicate the failsafe mode is disabled. Take the bind plug out before flying!

Even in the event of power disconnected, failsafe settings are still saved and will restore to its functions accordingly when power is provided.

About failsafe enabled:
When the primary receiver and satellite receiver is unable to detect any RF signal for continuous time interval of approximately 3 seconds, all channels will be restored to the saved setting. At this point the receiver will try to find valid RF signal. If valid signal is detected, the receiver will use the valid signal immediately.

About failsafe disabled:
When signal is lost for continuous time interval of approximately 3 seconds, all channels will have no output (all outputs are pulled to ground).

If you don’t like failsafe, make sure green light is not on before flying!