Three position servo

Projects Programming
1

I trying to write a code so that I can use three push buttons to make a servo move to three positions one for each button.
Thanks, Wally.

2

You didn't actually ask a question :wink: but presumably something's not working. Share your code and circuit diagram, and explain where you need help.

3

Sorry, I don’t know how to write the code. I would like someone to write the code for me.

Thanks, Wally.

4

did the internet search engines break...?

just one of MANY!

5

That tutorial shows the servo powered from the Arduino, which is a no-no even for a micro servo; don't do that.

edit... oops ... misread it that there are 3 servos.. but it's only 1 and 3 buttons:

new pic...

image
image705×411 7.46 KB

edit- Arduino power not shown :wink:

1 Like
6

Hello Greatnorthern
Try and test this example sketch.

/* BLOCK COMMENT
  ATTENTION: This Sketch contains elements of C++.
  https://www.learncpp.com/cpp-tutorial/
  Many thanks to LarryD
  https://europe1.discourse-cdn.com/arduino/original/4X/7/e/0/7e0ee1e51f1df32e30893550c85f0dd33244fb0e.jpeg
  https://forum.arduino.cc/t/three-position-servo/1000588
  Tested with Arduino: Mega[x] - UNO [ ] - Nano [ ]
*/
#define ProjectName "Three position servo"
#include <Servo.h>
Servo myservo;
// HARDWARE AND TIMER SETTINGS
// YOU MAY NEED TO CHANGE THESE CONSTANTS TO YOUR HARDWARE AND NEEDS
constexpr byte ServoPin {8};
constexpr int ServoStart {90};
// CONSTANT DEFINITION
enum Buttonstatus {Released, Pressed, Idle};
enum Timer {Stopp, Start, Redo};
// VARIABLE DECLARATION AND DEFINITION
unsigned long currentTime;
// -- objects -----------------------------------------
struct TIMER {              // has the following members
  unsigned long time2wait;  // memory for interval time
  unsigned long atPresent;  // memory for actual time
  int conduct;                        // control for stop/start/redo
};
struct BUTTON {              // has the following members
  byte pin;                         // port pin
  bool statusQuo;            // current state
  TIMER scan;                   // see TIMER struct
};
struct BUTTONSERVO  {        // has the following members
  int angle;                               // insert desired angle value 
  BUTTON knop;                    // see BUTTON struct
};
BUTTONSERVO buttonServos[] {
  {0, A0, false, 20, 0, Redo},
  {180, A1, false, 20, 0, Redo},
};
// -- services  -----------------------------------------
bool timerEvent (TIMER &timer) {
  bool reTurn = currentTime - timer.atPresent >= timer.time2wait && timer.conduct;
  if (reTurn) timer.conduct == Timer::Redo ? timer.atPresent = currentTime : timer.conduct = Timer::Stopp;
  return reTurn;
}
// ------------------------------
int getKnop( BUTTON &knop) {
  if (!timerEvent(knop.scan)) return Buttonstatus::Idle;
  int stateNew = !digitalRead(knop.pin);
  if (knop.statusQuo == stateNew) return Buttonstatus::Idle;
  return (knop.statusQuo=stateNew);
}
// -------------------------------------------------------------------
void setup() {
  Serial.begin(9600);
  Serial.println(F("."));
  Serial.print(F("File   : ")), Serial.println(__FILE__);
  Serial.print(F("Date   : ")), Serial.println(__DATE__);
  Serial.print(F("Project: ")), Serial.println(ProjectName);
  pinMode (LED_BUILTIN, OUTPUT);  // used as heartbeat indicator
  //  https://www.learncpp.com/cpp-tutorial/for-each-loops/
  for (auto &buttonServo : buttonServos) pinMode(buttonServo.knop.pin, INPUT_PULLUP);
  myservo.attach(ServoPin);
  myservo.write(ServoStart);
}
void loop () {
  currentTime = millis();
  digitalWrite(LED_BUILTIN, (currentTime / 500) % 2);
  for (auto &buttonServo : buttonServos) {
    if (getKnop(buttonServo.knop) == Pressed) myservo.write(buttonServo.angle);
  }
}

Have a nice day and enjoy coding in C++.
Дайте миру шанс!

7

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.