Other Arduino Codes and Videos by Robojax
In this video we learn how to control 32 Servo motors using PCA9685 and ESP32. This is version 5 video. Please watch V1 to learn how to calibrate the servo response. Please make sure NOT to copy the code, but rather download the zip file here.
/*
* Original PCA9685 Module library sourse: https://github.com/adafruit/Adafruit-PWM-Servo-Driver-Library
*
* This is the Arduino code PCA6985 32 channel servo controller
* to control 32 Servo Motors over WiFi using ESP32 MCU
*
* Watch video for this code:
*
* Related Videos
V5 video of PCA9685 32 Servo with ESP32 with WiFi https://youtu.be/bvqfv-FrrLM
V4 video of PCA9685 32 Servo with ESP32 (no WiFi): https://youtu.be/JFdXB8Za5Os
V3 video of PCA9685 how to control 32 Servo motors https://youtu.be/6P21wG7N6t4
V2 Video of PCA9685 3 different ways to control Servo motors: https://youtu.be/bal2STaoQ1M
V1 Video introduction to PCA9685 to control 16 Servo https://youtu.be/y8X9X10Tn1k
*
* Written by Ahmad Shamshiri for Robojax Video channel www.Robojax.com
* Date: Jan 25, 2021, in Ajax, Ontario, Canada
* 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/>.
*/
////////////////////// PCA9685 settings started
#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>
// called this way, it uses the default address 0x40
Adafruit_PWMServoDriver board1 = Adafruit_PWMServoDriver(0x40);
Adafruit_PWMServoDriver board2 = Adafruit_PWMServoDriver(0x41);
int maximumServo = 32;//how many servos are connected
// 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)
int servoAngle =0;
int servoStep = 10;
int stepDelay = 50;// 50 milliseconds
int servoAngleMin =0;
int servoAngleMax = 180;
// minimum angle of each servo
int allServoMin[]={
0, 0, 0, 0, 0, 0, 0, 0,// 1 to 8
0, 0, 0, 0, 0, 0, 0, 0,//9 to 16
0, 0, 0, 0, 0, 0, 0, 0,//17 to 24
0, 0, 0, 0, 0, 0, 0, 0};//25 to 32
//maximum value of each servo
int allServoMax[]={
180, 180, 180, 180, 180, 180, 180, 180,// 1 to 8
180, 180, 180, 180, 180, 180, 180, 180,//9 to 16
180, 180, 180, 180, 180, 180, 180, 180,//17 to 24
180, 180, 180, 180, 180, 180, 180, 180};//25 to 32
// initial position of servos
int allServoPosition[] ={
0, 0, 0, 0, 0, 0, 0, 0,// 1 to 8
0, 0, 0, 0, 0, 0, 0, 0,//9 to 16
0, 0, 0, 0, 0, 0, 0, 0,//17 to 24
0, 0, 0, 0, 0, 0, 0, 0};//25 to 32
int servoNumber = 100;//servo to move
int buttonPushed =0;
int allServo =0;
void handleServo();//this is prototype of function defined at the end of this code
int angleToPulse(int ang); //this is prototype of function defined at the end of this code
////////////////////////PCA9685 ended
#include "PCA9684_32Servo_ESP32.h"
#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <ESPmDNS.h>
const char *ssid = "Your WiFi SSID";
const char *password = "Your WiFi Password";
WebServer server(80);
const int led = 13;
/////////////////////////////////////
void handleRoot() {
//Watch video explanation for this https://youtu.be/bvqfv-FrrLM
String HTML_page = pageHeader_p1;
if(allServo)
{
HTML_page.concat("<div class=\"btn\"><a class=\"angleButton colorAll\" href=\"/servo?do=stop\">Stop Servo</a></div>");
}else{
HTML_page.concat("<div class=\"btn\"><a class=\"angleButton colorAll\" href=\"/servo?do=all\">All Servo</a></div>");
}
for (int i=0; i < maximumServo; i++)
{
HTML_page.concat("<div class=\"btn\"><a class=\"angleButton colorBtn\" href=\"/servo?move=");
HTML_page.concat(i);
HTML_page.concat("\">SRV ");
HTML_page.concat(i+1);
HTML_page.concat(" </a></div>");
}
HTML_page.concat("</body>
</html>");
server.send(200, "text/html", HTML_page);
}
void handleNotFound() {
digitalWrite(led, 1);
String message = "File Not Found
";
message += "URI: ";
message += server.uri();
message += "
Method: ";
message += (server.method() == HTTP_GET) ? "GET" : "POST";
message += "
Arguments: ";
message += server.args();
message += "
";
for (uint8_t i = 0; i < server.args(); i++) {
message += " " + server.argName(i) + ": " + server.arg(i) + "
";
}
server.send(404, "text/plain", message);
digitalWrite(led, 0);
}
void setup() {
//Watch video explanation for this https://youtu.be/bvqfv-FrrLM
board1.begin();
board2.begin();
board1.setPWMFreq(60); // Analog servos run at ~60 Hz updates
board2.setPWMFreq(60);
//initial position of all servos
for(int i=0; i < maximumServo; i++) {
if(i < 16)
{
board1.setPWM(i, 0, angleToPulse(allServoPosition[i]) );
}else{
board2.setPWM(i-15, 0, angleToPulse(allServoPosition[i]) );
}
}//for end
Serial.begin(115200);
Serial.println("32 channel Servo test!");
//Servo control using ESP32 from Robojax.com
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.println("");
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
if (MDNS.begin("robojaxESP32")) {
Serial.print("MDNS responder started at http://");
Serial.println("robojaxESP32");
}
server.on("/", handleRoot);
server.on("/servo", HTTP_GET, handleServo);
server.onNotFound(handleNotFound);
server.begin();
Serial.println("HTTP server started");
}
void loop() {
server.handleClient();
if(allServo ){
for( int angle =servoAngleMin; angle <= servoAngleMax; angle +=servoStep){
for(int i=0; i<16; i++)
{
board2.setPWM(i, 0, angleToPulse(angle) );
board1.setPWM(i, 0, angleToPulse(angle) );
}
delay(stepDelay);
}
// robojax PCA9865 32 channel Servo control
delay(100);
}//if pushed
if(false){
Serial.print("Servo #");
Serial.print (servoNumber);
Serial.print(" Angle ");
Serial.println(allServoPosition[servoNumber]);
}
if( buttonPushed && (servoNumber >=0 && servoNumber < maximumServo) ){
if(servoNumber < 16)
{
board1.setPWM(servoNumber, 0, angleToPulse(allServoPosition[servoNumber]) );
}else{
board2.setPWM(servoNumber-15, 0, angleToPulse(allServoPosition[servoNumber]) );
}
}
buttonPushed =0;
}
/*
* handleServo()
* update the buttonPushed varialbe
* returns nothing
* Written by Ahmad Shamshiri on Dec 29, 2019
* www.Robojax.com
* http://youTube.com/robojaxTV
*/
void handleServo() {
//Watch video explanation for this https://youtu.be/bvqfv-FrrLM
if(server.arg("do") == "all" )
{
allServo =1;
}else{
allServo =0;
}
int servoNumberRequested= server.arg("move").toInt();
if(servoNumberRequested >=0 && servoNumberRequested < maximumServo)
{
buttonPushed = 1;
if(allServoPosition[servoNumberRequested] == allServoMin[servoNumberRequested] ) {
allServoPosition[servoNumberRequested] = allServoMax[servoNumberRequested];
}else{
allServoPosition[servoNumberRequested] = allServoMin[servoNumberRequested];
}
servoNumber =servoNumberRequested;
}
handleRoot();
}//handleServo() end
/*
* angleToPulse(int ang)
* gets angle in degree and returns the pulse width
* also prints the value on seial monitor
* written by Ahmad Shamshiri for Robojax, 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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