Lua script not logging sensor data

ArduPilot Lua Scripting
1

Hi,
I’m trying to stop the motor when RPM threshold reached, using Lua script. Now I’m able to read the RPM value in QUICK, meaning the sensor works fine. But when I run the script it shows " RPM value not available" as per script, in the messages. Could you guide me with what I have missed ?

The RPM sensor is connected to AUX PWM pin1 (GPIO) and powered by ESC BEC connected to PWM AUX pin2 , SERVO10_FUNCTION = motor1.
SCR_ENABLE is enabled.

local motor_channel = 10 -- Channel for the motor 
local rpm_threshold = 100 -- RPM threshold for disengagement 

function update()
    local rpm_value = RPM:get_rpm(1) -- Read the RPM value from instance 1
    if rpm_value then
        gcs:send_text(6, "RPM Value: " .. tostring(rpm_value))
        if rpm_value >= rpm_threshold then
            gcs:send_text(6, "RPM threshold reached, disengaging motor")
            SRV_Channels:set_output_pwm_chan_timeout(motor_channel, 1000, 1000) -- Stop the motor
        end
    else
        gcs:send_text(6, "RPM Value not available")
    end
    return update, 1000 -- Schedule the update function to run again in 1000 milliseconds
end

return update, 1000 -- Schedule the update function to run for the first time in 1000 milliseconds

Thanks

2

I suspect you want instance 0.

local rpm_value = RPM:get_rpm(0)

Internally (and thus in scripting) we tend to be 0 indexed. Whereas on the GCS side things are presented as 1 indexed to be more user friendly.

2 Likes
3

It works, big thank. I spent two days trying to fix it :slight_smile: