library/Arduino/libraries/ESP32Servo/examples/Sweep/Sweep.ino

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2018-12-01 23:51:18 +01:00
/* Sweep
by BARRAGAN <http://barraganstudio.com>
This example code is in the public domain.
modified 8 Nov 2013
by Scott Fitzgerald
modified for the ESP32 on March 2017
by John Bennett
see http://www.arduino.cc/en/Tutorial/Sweep for a description of the original code
* Different servos require different pulse widths to vary servo angle, but the range is
* an approximately 500-2500 microsecond pulse every 20ms (50Hz). In general, hobbyist servos
* sweep 180 degrees, so the lowest number in the published range for a particular servo
* represents an angle of 0 degrees, the middle of the range represents 90 degrees, and the top
* of the range represents 180 degrees. So for example, if the range is 1000us to 2000us,
* 1000us would equal an angle of 0, 1500us would equal 90 degrees, and 2000us would equal 1800
* degrees.
*
* Circuit: (using an ESP32 Thing from Sparkfun)
* Servo motors have three wires: power, ground, and signal. The power wire is typically red,
* the ground wire is typically black or brown, and the signal wire is typically yellow,
* orange or white. Since the ESP32 can supply limited current at only 3.3V, and servos draw
* considerable power, we will connect servo power to the VBat pin of the ESP32 (located
* near the USB connector). THIS IS ONLY APPROPRIATE FOR SMALL SERVOS.
*
* We could also connect servo power to a separate external
* power source (as long as we connect all of the grounds (ESP32, servo, and external power).
* In this example, we just connect ESP32 ground to servo ground. The servo signal pins
* connect to any available GPIO pins on the ESP32 (in this example, we use pin 18.
*
* In this example, we assume a Tower Pro MG995 large servo connected to an external power source.
* The published min and max for this servo is 1000 and 2000, respectively, so the defaults are fine.
* These values actually drive the servos a little past 0 and 180, so
* if you are particular, adjust the min and max values to match your needs.
*/
#include <ESP32Servo.h>
Servo myservo; // create servo object to control a servo
// 16 servo objects can be created on the ESP32
int pos = 0; // variable to store the servo position
// Recommended PWM GPIO pins on the ESP32 include 2,4,12-19,21-23,25-27,32-33
int servoPin = 18;
void setup() {
myservo.attach(servoPin); // attaches the servo on pin 18 to the servo object
// using default min/max of 1000us and 2000us
// different servos may require different min/max settings
// for an accurate 0 to 180 sweep
}
void loop() {
for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
// in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(15); // waits 15ms for the servo to reach the position
}
}