Global variabale can't update.... see running var

Projects Programming
1

HI ALL, Here is my code, the main perpose is, when the IR get a single, let the servo running, to avoid more command to servo, I set global "running" to flag the servo status. but I always equal 0. why?

#define IR_RECEIVE_PIN 2
#define IR_SEND_PIN 3
#define SERVO_PIN 9  // D9 是舵机脚


#include <IRremote.hpp>
#include <Arduino.h>
#include <Servo.h>

uint8_t sAddress = 0;
uint8_t sCommand = 0x63;  // 十进制 99
uint8_t rCommand = 0x58;  // 十进制 88
uint8_t sRepeats = 0;
int running = 0;  // set it the Servo runing.


volatile uint8_t hitData;
Servo myservo;  // 创建一个舵机.

void setup() {
  Serial.begin(9600);  // 初始化串口通信
  IrSender.begin();
  IrReceiver.begin(IR_RECEIVE_PIN);
  pinMode(LED_BUILTIN, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(IR_RECEIVE_PIN), HIT, CHANGE);

  trun();
}

void HIT() {
  if (IrReceiver.decode()) {
    hitData = IrReceiver.decodedIRData.command;
    Serial.print("Reciev.");
    Serial.print(hitData);
    Serial.print("....running.....");
    Serial.println((int)&running,HEX);
    if (hitData == rCommand && running==0) {  // indicates received signal, checking it runing or not.
      Serial.println("Get Drop Command....");
      hitData = 0x00;
      running=1;  // set 1, flag it is running.
      trun();
      running=0;  // set it back to ready to run....
    }
  }
  IrReceiver.resume();
}

void loop() {
  // Serial.print("Send.");
  // Serial.println(sCommand);
  IrSender.sendNEC(sAddress, sCommand, sRepeats);
  delay(355);

  // trun();
}

void trun() {
  digitalWrite(LED_BUILTIN, HIGH);
  myservo.attach(SERVO_PIN);  // attaches the servo on pin 9 to the servo object
  // 开始旋转电机,100度
  int pos = 0;                              // variable to store the servo position
  for (int pos = 0; pos <= 60; 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(12);           // waits 15 ms for the servo to reach the position
  }
  delay(200);
  for (int pos = 60; pos >= 0; pos -= 1) {  // goes from 180 degrees to 0 degrees
    myservo.write(pos);                     // tell servo to go to position in variable 'pos'
    delay(12);                              // waits 15 ms for the servo to reach the position
  }
  digitalWrite(LED_BUILTIN, LOW);
  myservo.detach();
}
2

you set it back to 0

3

you should not attach and detach the servo each time you call this function.
detaching will stop the servo-signal and this means your servo does not receive any servo-signal and then is in an undefined state.

As long as you want the servo to keep its position = standing still you must send a servo-signal to the servo. myservo.detach() terminates signal-creation.
==> the servo does not know what to do and might start wiggling.

myServo.attach() is called only once in function setup.

read about how RC-servos work.

best regards Stefan

4

You are spending way too much time in an interrupt service routine, besides the fact that delay() should not be working at all while interrupts are disabled.

1 Like
5

trun() will take some time, the IRreceive 3 time each second, turn will spend more than 2 seconds, I need trun once after got IRReceive, if got more single from IR, don't need trigger turn.

6

not understandable
write with more words
and correct grammar

7

it doesn't matter how long turn() takes. at the line where you print running it is always 0

8

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