CodeCell: Controlling a Servo-Motor

CodeCell can drive low-power servo motors directly and uses its onboard motion sensor to bring interactive projects to life. 

How It Works

A servo motor is a rotary actuator that holds a specific angle based on an input signal (0°–180°). During setup, take note of the following points:

• Power via USB-C (up to 500 mA) or LiPo battery (up to 1500 mA) for higher-torque servos.
• Use the ESP32Servo library (available from Arduino Library Manager).
• Connect the servo’s signal pin to a GPIO, and use CodeCell’s GND and VO pins for power.

Example – Control Servo with Pitch Angle

This example reads the Pitch angle from CodeCell and moves the servo accordingly. The servo follows your tilt, which can be used for testing motion-based control or creating simple balancing mechanisms.

#include <CodeCell.h>
#include <ESP32Servo.h>

CodeCell myCodeCell;
Servo myservo;

float Roll = 0.0;
float Pitch = 0.0;
float Yaw = 0.0;
int servo_angle = 0;

void setup() {
  Serial.begin(115200);
  myCodeCell.Init(MOTION_ROTATION); // Enable rotation sensing
  myservo.attach(1);                // Connect servo to pin 1
}

void loop() {
  if (myCodeCell.Run(10)) {         // Run at 10 Hz
    myCodeCell.Motion_RotationRead(Roll, Pitch, Yaw);

    // Map Pitch angle to servo position
    servo_angle = abs((int)Pitch);
    servo_angle = 180 - servo_angle;

    // Limit movement range (0–60°)
    if (servo_angle > 60) servo_angle = 60;
    else if (servo_angle < 0) servo_angle = 0;

    Serial.println(servo_angle);
    myservo.write(servo_angle);     // Move servo to mapped angle
  }
}

Customization Tips

• Adjust Range: Modify servo_angle limits to match your servo’s mechanical range.
• Combine Sensors: Mix rotation control with proximity or light sensing for adaptive behavior.
• Use for Stabilization: Apply feedback logic for gimbals, camera mounts, or balancing platforms.