Ardunio development - steering gear control

Introduce

• Steering gear is a kind of driver that controls the motion state by input . The single chip microcomputer sends a signal to the steering gear , There is a reference circuit inside the steering gear , Generate a reference signal of a specific frequency , Compare the obtained bias voltage with the voltage of the potentiometer to obtain the voltage difference output . There is an integrated circuit on the circuit board to judge the rotation direction , Drive the coreless motor to start rotating , The power is transmitted to the swing arm through the reduction gear , Then the signal is sent back by the position detector , Determine whether the position has been reached . The angle range is 0 To 180 degree .
• The rotation angle of the steering gear is controlled by the pulse width , Pulse width by 0.5ms To 2.5ms Between , Pulse width and steering angle are 0° To 180° Corresponding .
  
• So there are two ways to control the steering gear
  • Use ordinary digital sensor interface to generate square waves with different proportions , simulation PWM Signal for steering gear positioning
  • Use Ardunio Of Servo Function to control the steering gear , Through digital interface 9 and 10 To drive .
• On the development board in the figure below wemos D1 On ,D1 To D8 All interfaces support PWM, Therefore, it can be specified as a specific port

Run the sample code

#include <Servo.h>

Servo myservo;  // create servo object to control a servo

int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup() {
    
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
}

void loop() {
    
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(15);                           // waits for the servo to get there
} 

Reference resources

https://docs.arduino.cc/learn/electronics/servo-motors