Other Arduino Codes and Videos by Robojax

Control 1 or more Servo Motors ONE ways using ESP32 Bluetooth using mobile device ESP32-SERV-BT-4

Control 1 or more Servo Motors ONE ways using ESP32 Bluetooth using mobile device ESP32-SERV-BT-4

This video shows how to control 1 or more servo motors using ESP32 and Bluetooth on mobile devices to control servo when pressing a button on screen the servo moves from 0° to 180° and next pressing from 180° to 0° or any angle you set in the code. So this is ONE way moving of servo.

We have 4 type of controling Servo Motor with ESP32

The link to use in the "preferences" of Arduino IDE for ESP32 board https://dl.espressif.com/dl/package_esp32_index.json Watch video for instructions.

Resources for this sketch


/*
 * Original Servo Library sourse: https://github.com/RoboticsBrno/ESP32-Arduino-Servo-Library
 * 
 * This is Arduino code to control Multiple servo motors with ESP32 boards over bluetooth 
 * When press a button on screen, Servo will go 0° to 180° and stops and next press will send the servo from 180° to 0° 
 * this is ESP-SERV-BT-4
 * The Mininum Angle(0°) and Maximum Angle (180°) can be set to any angle you prefer.
 * 
 * Watch video instruction for this code: https://youtu.be/FOz9u_R5eG4
-code ESP-SERV-BT-1 Using ESP32 Bluetooth to Control Servo motor to move it to any angle 
-code ESP-SERV-BT-2 Using ESP32 Bluetooth to Control Servo motor to move them 0° to 180° or in reverse or any angle    
-code ESP-SERV-BT-3 PUSH-RETURN Using ESP32 Bluetooth to Control 1 or more Servo motors to move them 0° to 180° or in reverse or any angle    
-code ESP-SERV-BT-4 Using ESP32 Bluetooth to Control 1 or more Servo motors to move them 0° to 180° or in reverse or any angle one way    

 * Written by Ahmad Shamshiri for Robojax Video channel www.Robojax.com
 * Date: Jan 10, 2019, at 20:25 in Ajax, Ontario, Canada
 * Permission granted to share this code given that this
 * note is kept with the code.
 * Disclaimer: this code is "AS IS" and for educational purpose only.
 * this code has been downloaded from http://robojax.com/learn/arduino/
 
 * Get this code and other Arduino codes from Robojax.com
Learn Arduino step by step in structured course with all material, wiring diagram and library
all in once place. Purchase My course on Udemy.com http://robojax.com/L/?id=62

****************************
Get early access to my videos via Patreon and have  your name mentioned at end of very 
videos I publish on YouTube here: http://robojax.com/L/?id=63 (watch until end of this video to list of my Patrons)
****************************

or make donation using PayPal http://robojax.com/L/?id=64

 *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include <Servo_ESP32.h>

const int servoCount = 4;
static const int servosPins[servoCount] = {12, 14, 27, 26};

Servo_ESP32 servos[servoCount];

const char turnON[] ={'a', 'b', 'c', 'd'};


int servoAngle[] ={0, 0, 0, 0};
int servoAngleStep[] ={10, 10, 10, 10};

int servoAngleMin[] ={0, 0, 0, 0};
int servoAngleMax[] ={180, 180, 180, 180};

int buttonPushed[] ={0, 0, 0, 0};
char receivedChar;// received value will be stored as CHAR in this variable
boolean fullDebug = true;//set to false or true. watch video for details

#include "BluetoothSerial.h"
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

void handleServo(int servoNum);
void setup() {
  // robojax.com code for servo https://youtu.be/FOz9u_R5eG4
  Serial.begin(115200);
  SerialBT.begin("ESP32_Robojax"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth
 with ESP32_Robojax");
  
    for(int i = 0; i < servoCount; ++i) {
        if(!servos[i].attach(servosPins[i])) {
            Serial.print("Servo ");
            Serial.print(i);
            Serial.println("attach error");
        }
    }
    //Servo control using ESP32 from Robojax.com

}

void loop() {
  //Robojax.com ESP32 Servo BT code
    receivedChar =(char)SerialBT.read();

  for(int i=0; i< servoCount; i++)
  {
       if(receivedChar == turnON[i]){
        buttonPushed[i] = 1;
       }//if 
  }//for


  for(int i=0; i< servoCount; i++)
  {
       if( buttonPushed[i] ){
        handleServo(i);//
       }//if 
  }//for

  
  for(int i=0; i< servoCount; i++)
  {
       servos[i].write(servoAngle[i]);
      
  }//for
   
  //servos[0].write(30);
   delay(20);

}//loop

/*
 * handleServo()
 * updates the servo angle
 * returns nothing
 * Written by Ahmad Shamshiri on Jan 10, 2019
 * www.Robojax.com
 * watch video for details https://youtu.be/FOz9u_R5eG4
 */
void handleServo(int servoNum)
{
  if(fullDebug)
  {
    SerialBT.print("Servo ");// write on BT app
    SerialBT.print(servoNum+1);// write on BT app 
    SerialBT.print(" at:");// write on BT app       
    SerialBT.println(servoAngle[servoNum]);// write on BT app 
    Serial.print("Servo ");//print on Serial Monitor
    Serial.print(servoNum+1);//print on Serial Monitor
    Serial.print(" at ");//print on Serial Monitor        
    Serial.println(servoAngle[servoNum]); //print on Serial Monitor     
  }
      servoAngle[servoNum] += servoAngleStep[servoNum];
       
        if (servoAngle[servoNum] >= servoAngleMax[servoNum]) {
          buttonPushed[servoNum] =0; 
          servoAngleStep[servoNum] = -servoAngleStep[servoNum];
            if(!fullDebug)
            {
            SerialBT.print("Servo ");// write on BT app
            SerialBT.print(servoNum+1);// write on BT app 
            SerialBT.print(" at:");// write on BT app       
            SerialBT.println(servoAngle[servoNum]);// write on BT app              
            }
        }
        
        if (servoAngle[servoNum] <= servoAngleMin[servoNum]) {
          buttonPushed[servoNum] =0;       
          servoAngleStep[servoNum] = -servoAngleStep[servoNum];
            if(!fullDebug)
            {
            SerialBT.print("Servo ");// write on BT app
            SerialBT.print(servoNum+1);// write on BT app 
            SerialBT.print(" at:");// write on BT app       
            SerialBT.println(servoAngle[servoNum]);// write on BT app              
            }          
        }
    
}//handleServo

   

If you found this tutorial helpful, please support me so I can continue creating content like this. You can support me on Patreon ( Launched June 14, 2019): http://bit.ly/2ZnITLz

Or support me via PayPal