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Code Issues Wiki Activity

References cleanflight/cleanflight#631 - added feature FAILSAFE and spellchecked

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Miha Valencic 2015-03-19 09:47:50 +01:00
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docs/Failsafe.md
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@ -10,15 +10,15 @@ The idea is that you set throttle and other controls so the aircraft descends in
Flight controller based failsafe is where the flight controller attempts to detect signal loss from your receiver.
It is possible to use both types at the same time which may be desirable. Flight controller failsafe can even help if your receiver signal wires come loose, get damaged or your receiver malfunctions in a way the receiver itself cannot detect.
It is possible to use both types at the same time, which may be desirable. Flight controller failsafe can even help if your receiver signal wires come loose, get damaged or your receiver malfunctions in a way the receiver itself cannot detect.
## Flight controller failsafe system
The failsafe system is not activated until 5 seconds after the flight controller boots up. This is to prevent failsafe from activating, as in the case of TX/RX gear with long bind procedures, before the RX sends out valid data.
The failsafe system is not activated until 5 seconds after the flight controller boots up. This is to prevent failsafe from activating, as in the case of TX/RX gear with long bind procedures, before the RX sends out valid data. Note that you need to activate the 'FAILSAFE' feature in order to activate failsafe on flight controller.
After the failsafe has forced a landing, the flight controller cannot be armed and has to be reset.
The failsafe system attempts to detect when your receiver loses signal. It then attempts to prevent your aircraft from flying away uncontrollably by enabling an auto-level mode and setting the throttle that should allow the craft to come to a safter landing.
The failsafe system attempts to detect when your receiver loses signal. It then attempts to prevent your aircraft from flying away uncontrollably by enabling an auto-level mode and setting the throttle that should allow the craft to come to a safer landing.
The failsafe is activated when:
@ -53,21 +53,21 @@ Bench test the failsafe system before flying - remove props while doing so.
1. Observe motors spin at configured throttle setting for configured duration.
1. Turn on TX or reconnect RX.
1. Ensure that your switch positions don't now cause the craft to disarm (otherwise it would fall out of the sky on regained signal).
1. Observe that normal flight behaviour is resumed.
1. Observe that normal flight behavior is resumed.
1. Disarm.
Field test the failsafe system
1. Perform bench testing first!
1. On a calm day go to an un-populated area away from buildings or test indoors in a safe controlled environment - e.g. inside a big net.
1. On a calm day go to an unpopulated area away from buildings or test indoors in a safe controlled environment - e.g. inside a big net.
1. Arm the craft.
1. Hover over something soft (long grass, ferns, heather, foam, etc).
1. Hover over something soft (long grass, ferns, heather, foam, etc.).
1. Descend the craft and observe throttle position and record throttle value from your TX channel monitor. Ideally 1500 should be hover. So your value should be less than 1500.
1. Stop, disarm.
1. Set failsafe thottle to the recorded value.
1. Set failsafe throttle to the recorded value.
1. Arm, hover over something soft again.
1. Turn off TX (!)
1. Observe craft descends and motors continue to spin for the configurated duration.
1. Observe craft descends and motors continue to spin for the configured duration.
1. Observe FC disarms after the configured duration.
1. Remove flight battery.
@ -93,8 +93,10 @@ See your receiver's documentation for direction on how to accomplish one of thes
3. Set 'failsafe_throttle' to a value that allows the aircraft to descend at approximately one meter per second.
4. Enable 'FAILSAFE' feature in Cleanflight GUI or via CLI using `feature FAILSAFE`
These are the basic steps for flight controller failsafe configuration, see Failsafe Settings below for additional settings that may be changed.
These are the basic steps for flight controller failsafe configuration; see Failsafe Settings below for additional settings that may be changed.
##Failsafe Settings
@ -132,5 +134,5 @@ Only valid when using Parallel PWM or PPM receivers.
This setting helps detect when your RX stops sending any data when the RX looses signal.
With a Graupner GR-24 configured for PWM output with failsafe on channels 1-4 set to OFF in the receiver settings
then this setting, at its default value, will allow failsafe to be activated.
With a Graupner GR-24 configured for PWM output with failsafe on channels 1-4 set to OFF in the receiver settings then this setting, at its default value, will allow failsafe to be activated.