Making a servo motor move faster

Other Hardware Motors, Mechanics, Power and CNC
1

I am new to Arduino, and for my first project, Im trying to make a motion sensor. Basically, I have it set up so that whenever the motion sensor is triggered, which is based on if the object close to it is 120 cm away, a LED turns on and a servo motor runs. However, I have a mini water gun that I want to fire with that servo motor. I have linked the model closest to mine I could find. However, my servo motor does not move fast enough for it to trigger the water gun, as it requires a quick push on the trigger as far as it can go to fire. I have a Micro Servo 9g SG90, and as well as everything in the Elegoo Uno R3 Most Complete Starter Kit.

#include <Servo.h>

Servo myServo;

const int trigPin = 7;
const int echoPin = 6;
const int ledPin = 13;  
const int servoPin = 5;

float duration, distance;

void setup() {
  myServo.attach(servoPin);
  myServo.write(330);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);  
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delay(2);
  digitalWrite(trigPin, HIGH);
  delay(10);  
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
//gets one way in cm
  distance = (duration / 29)/2;
  Serial.print("Distance: ");
  Serial.println(distance);
  
  if(distance > 0 && distance < 120){
    digitalWrite(ledPin, HIGH);
    servoSpin();
  } else {
    digitalWrite(ledPin, LOW);
    
  }
  delay(250); 
}

void servoSpin(){
  
  myServo.write(0);
  myServo.write(330);
}

Link to water gun model:
water gun

Anyone got any tips?

2

Then you need to use an appropriate device, not a servo. Try fitting a solenoid to your project. Make it pull or push the trigger and it will go VERY fast.

3 
  myServo.write(0);
  myServo.write(330);

In your code the servo has no time to move to 0 before trying to get to 330

However, the write() function will only take values between 0 and 180 for the servo angle.

What exactly are those two lines of code intended to do ?

4

You do not need this test. pulseIn() return a counter, which is non-negative, so distance will never be negative.