Run a script using servo activation as trigger

IcePanda · August 22, 2020, 7:32pm

Hi! I’m an undergraduate student, new to Mission Planner.
I want to know if it’s possible to run a script (Lua or python) using a certain servo’s position as the trigger.
The particular problem I want to solve is saving or printing somewhere the altitude of the plane when the servo changes its position. This needs to be achieved at any point of the mission.

iampete · August 22, 2020, 8:34pm

sure, the possible with onboard lua scripting

iampete · September 12, 2020, 9:58pm

Check out this example,

github.com

ArduPilot/ardupilot/blob/master/libraries/AP_Scripting/examples/servo_set_get.lua

-- Testing set_output_pwm_chan_timeout and get_output_pwm
--
-- This will set MAIN1 servo to 1700 pwm for 1 second,
-- then assigned function behavior for 1 second, and then 1100 pwm for 1 second

local flipflop = true
local K_AILERON = 4
local aileron_channel = SRV_Channels:find_channel(K_AILERON)

function update()
    if flipflop then
        SRV_Channels:set_output_pwm_chan_timeout(aileron_channel, 1700, 1000)
        gcs:send_text(6, "flip---")
    else
        SRV_Channels:set_output_pwm_chan_timeout(aileron_channel, 1100, 1000)
        gcs:send_text(6, "---flop")
    end
    flipflop = not flipflop
    output_pwm = SRV_Channels:get_output_pwm(K_AILERON)
    gcs:send_text(6, "Function "..K_AILERON..", channel "..aileron_channel..", output "..output_pwm)

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Note that you will have to run the dev version of the code to use this binding.