milespeterson101
Published

Arduino Robotic Arm

Build you own Robot arm to grab objects with just 3 servos and one Arduino UNO!

IntermediateFull instructions provided3,619
Arduino Robotic Arm

Things used in this project

Hardware components

SG90 Micro-servo motor
SG90 Micro-servo motor
×3
Tactile Switch, SPST-NO
Tactile Switch, SPST-NO
×2
Resistor 1k ohm
Resistor 1k ohm
×2
Resistor 220 ohm
Resistor 220 ohm
×5
LED, Green
LED, Green
×5
Jumper wires (generic)
Jumper wires (generic)
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×1
Arduino UNO
Arduino UNO
×1
Rotary potentiometer (generic)
Rotary potentiometer (generic)
×3

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Hot glue gun (generic)
Hot glue gun (generic)
Breadboard, 400 Pin
Breadboard, 400 Pin

Story

Read more

Schematics

Robot arm schematic

This might be a bit confusing but all you need to do is wire this correctly and the result is worth it.

Code

Robot Arm Code

Arduino
here is the robot arm code! Copy in an put it in Arduino IDE software And upload it to your Arduino UNO.
//Original code by Ryan Chan. Updated code by MilesPeterson101 Thanks to Ryan Chan for the concept!

#include <Servo.h>

Servo servo1; //Servos
Servo servo2;
Servo servo3;

const int LED1 = 2; //LEDs
const int LED2 = 3;
const int LED3 = 4;
const int LED4 = 7;
const int LED5 = 8;

const int button1 = 12; //Buttons
const int button2 = 13;

int button1Presses = 0; //Button values
boolean button2Pressed = false;

const int pot1 = A0; //Potentimeters
const int pot2 = A1; 
const int pot3 = A2;

int pot1Val; //Potentimeter values
int pot2Val;
int pot3Val;
int pot1Angle;
int pot2Angle;
int pot3Angle;

int servo1PosSaves[] = {1,1,1,1,1}; //position saves
int servo2PosSaves[] = {1,1,1,1,1};
int servo3PosSaves[] = {1,1,1,1,1};

void setup() {
  servo1.attach(5); // Set up everything and will run once; attach servos and define the pin modes
  servo2.attach(6);
  servo3.attach(9);
  
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly: 
  pot1Val = analogRead(pot1); // This will read the values from the potentimeters and store it...
  pot1Angle = map(pot1Val, 0, 1023, 0, 179); // ... and this will map the values from the potentiometers to values the servos can use and store it for later use
  pot2Val = analogRead(pot2); 
  pot2Angle = map(pot2Val, 0, 1023, 0, 179);
  pot3Val = analogRead(pot3);
  pot3Angle = map(pot3Val, 0, 1023, 0, 179);
  
  servo1.write(pot1Angle); // These will make the servos move to the mapped angles
  servo2.write(pot2Angle);
  servo3.write(pot3Angle);
  
  if(digitalRead(button1) == HIGH){ // This will check how many times button1 is pressed and save the positions to an array depending on how many times it is pressed; switch/case works like a if statement
    button1Presses++;
    switch(button1Presses){
      case 1:
        servo1PosSaves[0] = pot1Angle;
        servo2PosSaves[0] = pot2Angle;
        servo3PosSaves[0] = pot3Angle;
        digitalWrite(LED1, HIGH);
        Serial.println("Pos 1 Saved");
        break;
      case 2:
         servo1PosSaves[1] = pot1Angle;
         servo2PosSaves[1] = pot2Angle;
         servo3PosSaves[1] = pot3Angle;
         digitalWrite(LED2, HIGH);
         Serial.println("Pos 2 Saved");
         break;
      case 3:
         servo1PosSaves[2] = pot1Angle;
         servo2PosSaves[2] = pot2Angle;
         servo3PosSaves[2] = pot3Angle;
         digitalWrite(LED3, HIGH);
         Serial.println("Pos 3 Saved");
         break;
       case 4:
         servo1PosSaves[3] = pot1Angle;
         servo2PosSaves[3] = pot2Angle;
         servo3PosSaves[3] = pot3Angle;
         digitalWrite(LED4, HIGH);
         Serial.println("Pos 4 Saved");
         break;
       case 5:
         servo1PosSaves[4] = pot1Angle;
         servo2PosSaves[4] = pot2Angle;
         servo3PosSaves[4] = pot3Angle;
         digitalWrite(LED5, HIGH);
         Serial.println("Pos 5 Saved");
         break;
    }
  }

  if(digitalRead(button2) == HIGH){ // Pretty self-explnatory here
    button2Pressed = true;   
  }
  
  if(button2Pressed){ // if the boolean button2Press is true, then the servos will run though all their saved positions
    for(int i = 0; i < 5; i++){
        servo1.write(servo1PosSaves[i]);
        servo2.write(servo2PosSaves[i]);
        servo3.write(servo3PosSaves[i]);
        Serial.println(" potentimeter Angles: ");
        Serial.println(servo1PosSaves[i]);
        Serial.println(servo2PosSaves[i]);
        Serial.println(servo3PosSaves[i]);
        delay(1050);
      }
  }
  delay(300);
}

Credits

milespeterson101

milespeterson101

3 projects • 8 followers

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