Hi, I am new to Arduino. I found the following code on DroneBot Workshop where a servo is controlled by a rotary encoder but I get a compiling error.
/*
Rotary Encoder with Servo Motor Demo
rot-encode-servo-demo.ino
Demonstrates operation of Rotary Encoder
Positions Servo Motor
Displays results on Serial Monitor
DroneBot Workshop 2019
https://dronebotworkshop.com
*/
// Include the Servo Library
#include <Servo.h>
// Rotary Encoder Inputs
#define inputCLK 4
#define inputDT 5
// Create a Servo object
Servo myservo;
int counter = 0;
int currentStateCLK;
int previousStateCLK;
void setup() {
// Set encoder pins as inputs
pinMode (inputCLK,INPUT);
pinMode (inputDT,INPUT);
// Setup Serial Monitor
Serial.begin (9600);
// Attach servo on pin 9 to the servo object
myservo.attach(9);
// Read the initial state of inputCLK
// Assign to previousStateCLK variable
previousStateCLK = digitalRead(inputCLK);
}
void loop()
// Read the current state of inputCLK
currentStateCLK = digitalRead(inputCLK);
// If the previous and the current state of the inputCLK are different then a pulse has occured
if (currentStateCLK != previousStateCLK){
// If the inputDT state is different than the inputCLK state then
// the encoder is rotating counterclockwise
if (digitalRead(inputDT) != currentStateCLK) {
counter --;
if (counter<0){
counter=0;
}
} else {
// Encoder is rotating clockwise
counter ++;
if (counter>180){
counter=180;
}
}
// Move the servo
myservo.write(counter);
Serial.print("Position: ");
Serial.println(counter);
}
// Update previousStateCLK with the current state
previousStateCLK = currentStateCLK;
}
This is the error message I copied while compiling
Arduino: 1.8.16 (Windows 10), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"
Servo_with_Rotary:46:4: error: expected initializer before 'currentStateCLK'
currentStateCLK = digitalRead(inputCLK);
^~~~~~~~~~~~~~~
Servo_with_Rotary:49:4: error: expected unqualified-id before 'if'
if (currentStateCLK != previousStateCLK){
^~
Servo_with_Rotary:75:4: error: 'previousStateCLK' does not name a type
previousStateCLK = currentStateCLK;
^~~~~~~~~~~~~~~~
Servo_with_Rotary:76:2: error: expected declaration before '}' token
}
^
exit status 1
expected initializer before 'currentStateCLK'
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
See