Other Arduino Codes and Videos by Robojax

Control 16 Servo motor using PCA9685 Module and Arduino V2 Sketch #1 ONE-By-ONE

Control 16 Servo motor using PCA9685 Module and Arduino V2 Sketch #1 ONE-By-ONE

In this video we learn how to control 16 Sermo motors using PCA9685 PWM conroller with I2C

We have 3 sketches for this Tutorial

Other Videos on PCA9685

-V1 Video and code on PCA9685 (introduction and calibration)
-V2-1 Video and code on PCA9685 Servo Control ONE-By-ONE
-V2-2 Video and code on PCA9685
-V2-3 Video and code on PCA9685
-V3 Contro 32 Servo Motor with PCA9685 and Arduino
-V4 Video and code on PCA9685 32 Servo with ESP32

Resources for this sketch

Code #1 Arduino Code to run one by one all servos from 0 to 180°

This code shows how control each servo one-by-one more them 10°, 20°, 30°.... up 180°.
Servos are numbered from 0 to 15.

 * Original sourse: https://github.com/adafruit/Adafruit-PWM-Servo-Driver-Library
 * This is the Arduino code PAC6985 16 channel servo controller
 * watch the video for details (V1) and demo http://youtu.be/y8X9X10Tn1k
 *  This code is #1 for V2 Video Watch the video :https://youtu.be/bal2STaoQ1M
 *  I have got 3 codes as follow:
   #1-Arduino Code to run one by one all servos from 0 to 180°   
   #2-Arduino Code to control specific servos with specific angle
   #3-Arduino Code to run 2 or all servos at together
 * Written/updated by Ahmad Shamshiri for Robojax Video channel www.Robojax.com
 * Date: Dec 16, 2017, 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
    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/>.

  This is an example for our Adafruit 16-channel PWM & Servo driver
  Servo test - this will drive 16 servos, one after the other

  Pick one up today in the adafruit shop!
  ------> http://www.adafruit.com/products/815

  These displays use I2C to communicate, 2 pins are required to  
  interface. For Arduino UNOs, thats SCL -> Analog 5, SDA -> Analog 4

  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution

#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>

// called this way, it uses the default address 0x40
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();
// you can also call it with a different address you want
//Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(0x41);

// Depending on your servo make, the pulse width min and max may vary, you 
// want these to be as small/large as possible without hitting the hard stop
// for max range. You'll have to tweak them as necessary to match the servos you
// have!
// Watch video V1 to understand the two lines below: http://youtu.be/y8X9X10Tn1k
#define SERVOMIN  125 // this is the 'minimum' pulse length count (out of 4096)
#define SERVOMAX  575 // this is the 'maximum' pulse length count (out of 4096)

// our servo # counter
uint8_t servonum = 0;

void setup() {
  Serial.println("16 channel Servo test!");

  pwm.setPWMFreq(60);  // Analog servos run at ~60 Hz updates


// the code inside loop() has been updated by Robojax
void loop() {

//watch video for details: https://youtu.be/bal2STaoQ1M
for(int i=0; i<16; i++)
    for( int angle =0; angle<181; angle +=10){
        pwm.setPWM(i, 0, angleToPulse(angle) );
        // see YouTube video for details (robojax)
  // robojax PCA9865 16 channel Servo control
  delay(1000);// wait for 1 second

/* angleToPulse(int ang)
 * @brief gets angle in degree and returns the pulse width
 * @param "ang" is integer represending angle from 0 to 180
 * @return returns integer pulse width
 * Usage to use 65 degree: angleToPulse(65);
 * Written by Ahmad Shamshiri on Sep 17, 2019. 
 * in Ajax, Ontario, Canada
 * www.Robojax.com 
int angleToPulse(int ang){
   int pulse = map(ang,0, 180, SERVOMIN,SERVOMAX);// map angle of 0 to 180 to Servo min and Servo max 
   Serial.print("Angle: ");Serial.print(ang);
   Serial.print(" pulse: ");Serial.println(pulse);
   return pulse;

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