Build Instructions

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• 1

  Circuit Connection

  The only circuit connection we need is connection between ESP32 and servo motor :
  
  

  ESP32 ------------ Servo motor
  VIN ----------------- VCC (Red pin)
  GND ---------------- GND (Brown pin)
  D12 ----------------- PWM pin (Orange pin)

• 2

  The Voice Control App

  Following is the app I used to send the voice commands from our smartphone to ESP32 via Bluetooth :
  https://play.google.com/store/apps/details?id=com.locominder.bluetoothvoicecontrol

  
  This voice control app is very quick to get started and It has some example codes for both Arduino and ESP32. Next, let us see the project code.

• 3

  Project Code

  I used Arduino IDE to program ESP32. We need the ESP32Servo library needs to install in Arduino IDE to control the servo motor using ESP32. Check the attached image for the ESP32Servo library. After installing the library upload the following code to the ESP32 and the project will work like a charm. Check the project in action in the above video

  #include "BluetoothSerial.h"
  #include <ESP32Servo.h>
  #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
  #error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
  #endif
  #if !defined(CONFIG_BT_SPP_ENABLED)
  #error Serial Bluetooth not available or not enabled. It is only available for the ESP32 chip.
  #endif
  BluetoothSerial SerialBT;
  Servo light_servo;
  const int light_servo_pin = 12;
  void setup()
  {
  Serial.begin(115200);
  SerialBT.begin("ESP32Circuit"); //BLUETOOTH DEVICE NAME
  light_servo.attach(light_servo_pin);
  light_servo.write(133);
  }
  void loop() {
  if (SerialBT.available()) {
  String value = SerialBT.readStringUntil('\n');
  value.toLowerCase();
  Serial.println(value);
  if(value == "light on")
  {
  light_servo.write(70);
  }
  if(value == "light off")
  {
  light_servo.write(133);
  }
  }
  }

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