Beginner Project: Build Your Own Otto DIY Humanoid Robot

#include <Servo.h>
#include <SoftwareSerial.h>

// ———- Bluetooth ———-
SoftwareSerial BT(11, 12); // D11 = RX, D12 = TX

// ———- Servo Motors ———-
Servo leftLeg, rightLeg, leftFoot, rightFoot;

// ———- Setup ———-
void setup() {
BT.begin(9600);
Serial.begin(9600);

// Attach servos to pins
leftLeg.attach(2);
rightLeg.attach(3);
leftFoot.attach(4);
rightFoot.attach(5);

// Start at neutral position
centerPosition();
Serial.println(“Quadruped Robot Ready!“);
}

// ———- Main Loop ———-
void loop() {
if (BT.available()) {
char cmd = BT.read();
Serial.print(“Command: “);
Serial.println(cmd);

switch (cmd) {
case ‘F‘: walkForward(); break;
case ‘B‘: walkBackward(); break;
case ‘L’: turnLeft(); break;
case ‘R‘: turnRight(); break;
case ‘D‘: dance(); break;
case ‘S‘: centerPosition();break;
}
}
}

// ———- Servo Control Functions ———-
void centerPosition() {
leftLeg.write(90);
rightLeg.write(90);
leftFoot.write(90);
rightFoot.write(90);
}

void walkForward() {
leftLeg.write(120); rightLeg.write(60);
delay(300);
leftLeg.write(90); rightLeg.write(90);
delay(300);
}

void walkBackward() {
leftLeg.write(60); rightLeg.write(120);
delay(300);
leftLeg.write(90); rightLeg.write(90);
delay(300);
}

void turnLeft() {
leftFoot.write(60); rightFoot.write(120);
delay(500);
centerPosition();
}

void turnRight() {
leftFoot.write(120); rightFoot.write(60);
delay(500);
centerPosition();
}

void dance() {
for (int i = 0; i < 3; i++) {
leftLeg.write(60); rightLeg.write(120);
delay(300);
leftLeg.write(120); rightLeg.write(60);
delay(300);
}
centerPosition();
}