Other Arduino Codes and Videos by Robojax
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.
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.
/*
* 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
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* * 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
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