SERVO WITH ARDUINO UNO

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Circuit Diagram:



Automated Servo Arm Sweep Control via Arduino UNO PWM

Hardware Wire Bus Distribution Index

Ensure your connections align precisely with this physical hardware configuration map to isolate power and signal pathways safely:

Actuator Core Wire Target Controller Location Signal System Purpose
Brown / Black Line GND Pin Terminal Common Circuit Ground Reference
Red Power Line 5V Power Rail Pin 5V Main Logic System Power Supply
Orange / Yellow Line Digital Pin 9 (PWM) Pulse Width Modulation Signal Command Bus
⚠️ POWER BUS CURRENT PARAMETER: Small hobby servos (like the standard SG90) can pull power directly from the 5V terminal line of an Arduino UNO during light sweeps. However, high-load configurations or larger servos require an isolated external 5V power adapter to avoid drawing too much current and triggering a system reset.

System Operational Verification Checks

  • Mechanical Step Delay: The code injects a brief delay(15); step constraint. This structural gap gives the motor arm enough physical runtime to reach the assigned coordinate step safely before processing the next target change.
  • Telemetry Profiling: Keeping the data rate balanced at 9600 Baud lets you track directional shifts in real time without causing any communication lag on your controller loop.

Signal Bus Flow & Step Mechanics

The control loop monitors step metrics, translating iterative integer values into distinct positional outputs via software loops before cycling angular sweeps backwards:

[ Step Index Increment (0 to 180) ] ──► Write PWM Duty Width to Target Pin │ ▼ (Digital Pin 9 Rail Line) [ Geared Servo Driver Stage ] ─────────► Updates Position Angle (15ms Step Gap) │ ▼ (Boundary Wait State Trigger) [ Loop Direction Pivot ] ──────────────► Cycles Decrement Steps (180 down to 0)

Source Firmware Application

Review the primary C++ code file container block below. The control utilities are hosted inside the top panel frame for instant deployment copying:

📁 servo_sweep.ino
Arduino C++ 
#include <Servo.h>  // Include the built-in Arduino Servo library

Servo myServo;  // Create a servo object to control our motor

int angle = 0;    // Variable to store the current servo position

void setup() {
  // Attach the servo motor object to digital Pin 9
  myServo.attach(9);
  
  // Initialize Serial Monitor for position tracking
  Serial.begin(9600);
  Serial.println("--- Servo Sweep Project Initialized ---");
}

void loop() {
  // Sweep forward from 0 to 180 degrees
  Serial.println("Sweeping forward...");
  for (angle = 0; angle <= 180; angle += 1) { 
    myServo.write(angle);              // Tell servo to go to this position
    delay(15);                         // Wait 15ms for the motor arm to physically reach it
  }
  
  delay(1000); // Wait 1 second at the 180-degree mark
  
  // Sweep backward from 180 down to 0 degrees
  Serial.println("Sweeping backward...");
  for (angle = 180; angle >= 0; angle -= 1) { 
    myServo.write(angle);              // Tell servo to go to this position
    delay(15);                         // Wait 15ms for the arm to move
  }
  
  delay(1000); // Wait 1 second at the 0-degree mark
}

Project Video Demonstration

📺 PROJECT VIDEO DEMONSTRATION

Watch the step-by-step setup walkthrough and live hardware integration tests in action:

🌐 Launch Virtual Wokwi Simulation

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