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Diffstat (limited to 'libraries/ESP32Servo/examples/Sweep')
| -rw-r--r-- | libraries/ESP32Servo/examples/Sweep/Sweep.ino | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libraries/ESP32Servo/examples/Sweep/Sweep.ino b/libraries/ESP32Servo/examples/Sweep/Sweep.ino new file mode 100644 index 0000000..f1738fb --- /dev/null +++ b/libraries/ESP32Servo/examples/Sweep/Sweep.ino @@ -0,0 +1,82 @@ +/* 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 +// Possible PWM GPIO pins on the ESP32-S2: 0(used by on-board button),1-17,18(used by on-board LED),19-21,26,33-42 +// Possible PWM GPIO pins on the ESP32-S3: 0(used by on-board button),1-21,35-45,47,48(used by on-board LED) +// Possible PWM GPIO pins on the ESP32-C3: 0(used by on-board button),1-7,8(used by on-board LED),9-10,18-21 +#if defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32S3) +int servoPin = 17; +#elif defined(CONFIG_IDF_TARGET_ESP32C3) +int servoPin = 7; +#else +int servoPin = 18; +#endif + +void setup() { + // Allow allocation of all timers + ESP32PWM::allocateTimer(0); + ESP32PWM::allocateTimer(1); + ESP32PWM::allocateTimer(2); + ESP32PWM::allocateTimer(3); + myservo.setPeriodHertz(50); // standard 50 hz servo + myservo.attach(servoPin, 1000, 2000); // 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 + } +} + |