Drone Servo Airdrop Module

The solution for drone airdrops uses a 4G module for an elegant airdrop; a simple phone call is all it takes to land the drone, which is far more graceful than circling twice in the air. Currently, the module feels too heavy; the servo alone weighs 10 grams, and with the battery and Air780 module, it's still too heavy compared to the 25-gram module sold online. However, a more elegant, lightweight solution without servos has flashed through my mind. Of course, I'll definitely consider it next time.

```

Luatos servo control reference code (SMS control, the servo will rotate upon receiving any SMS message)

PROJECT = 'kongtou'
VERSION = '0.0.1'
-- sys library is standard
_G.sys = require("sys")

---------------------------------------


local PWM_ID = 1

-- Define servo control function
local function setServoAngle(pwmId, angle)
-- Convert angle to pulse width (microseconds)
local pulseWidth = (angle * 10) + 500 -- From 500 to 2500 microseconds
-- Convert pulse width to duty cycle
local dutyCycle = (pulseWidth / 20000) * 100
-- Set PWM
pwm.open(pwmId, 50, dutyCycle, 0, 100) -- 50Hz frequency, corresponding to the duty cycle of the angle
end

sys.subscribe("SMS_INC", function(phone,sms)
log.info("sms",phone,sms)
setServoAngle(PWM_ID, 0)
end)


sys.subscribe("CC_IND", function(status, value)
log.info("cc status", status, value)
setServoAngle(PWM_ID, 0)


end)

sys.taskInit(function()
-- pwm.open(PWM_ID, 50, 1500) -- Initial position is 1800 degrees
setServoAngle(PWM_ID, 180)

end)


-- User code has ended---------------------------------------------

-- The ending is always this line

sys.run()

-- Do not add any statements after sys.run()!!!!!

```


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