Screeching sound in Arduino uno

Projects Programming
1

I improved my code but why is there only a screeching sound when I connect to ARDUINO。

#include <funshield.h>

int LEDS[] = { 1, 2, 3, 4 };

bool STATES[] = { true, true, true, true, true };

// Pins are different between Arduino and Attiny

#if defined(__AVR_ATtiny85__)

#define ARDUINO 0

#define ledPin 0     

#define lightPin 3    // CdS or pushbutton hooked from PB4 (Pin 3, A2/D4) to ground

#define lightPullUp 3

#define touchPin 1

#define touchPullUp 2

#else  

#define ARDUINO 1

#define ledPin 9  // RGB red

#define lightPin A1

#define lightPullUp A1

#define touchPin A3

#define touchPullUp A3

#endif

int on_time = 10;  // in seconds

void setup() {

#if (ARDUINO)

    Serial.begin(9600);

    Serial.println("SMD_heart");

#endif

    // setup heart pin

    pinMode(ledPin, INPUT);

    // setup other LEDs

    for (int LED = 0; LED < (sizeof(LEDS) / sizeof(int)); LED++) {

        pinMode(LEDS[LED], OUTPUT);

        digitalWrite(LEDS[LED], STATES[LED]);

    }

}

void loop() {

    heartBeat(on_time);

}

boolean heartBeat(int on_time) {

    // based on http://dlnmh9ip6v2uc.cloudfront.net/datasheets/E-Textiles/Lilypad/LilyTiny.ino

    // Variables and constants for fading pin. Needs to be a hardware PWM pin; on

    byte heartStage = 0;

    int heartBrightness = 0;

    byte heartCounter = 0;

    long off_time = millis() + on_time * 1000;

    pinMode(ledPin, OUTPUT);

    digitalWrite(ledPin, HIGH);

    while (millis() < off_time) {

        delayMicroseconds(9999);

        // calculate brightness for heartbeat pin (by cycling 

        // through phases of pulse pattern)

        heartCounter++;

        if (heartCounter > 144) {

            heartStage = (heartStage + 1) % 4;

            heartCounter = 0;

        }

        else {

            switch (heartStage) {

            case 0:

                analogWrite(ledPin, heartBrightness);

                heartCounter += 144 / 12.0;

                heartBrightness += 255 / 12.0;

                if (heartBrightness > 255)

                    heartBrightness = 255;

                break;

            case 1:

                analogWrite(ledPin, heartBrightness);

                heartCounter += 144 / 24.0;

                heartBrightness -= 255 / 24.0;

                if (heartBrightness < 0)

                    heartBrightness = 0;

                break;

            case 2:

                analogWrite(ledPin, heartBrightness);

                heartCounter += 144 / 12.0;

                heartBrightness += 255 / 12.0;

                if (heartBrightness > 255)

                    heartBrightness = 255;

                break;

            case 3:

                analogWrite(ledPin, heartBrightness);

                heartCounter += 144 / 72.0;

                heartBrightness -= 255 / 72.0;

                if (heartBrightness < 0)

                    heartBrightness = 0;

                break;

            }//switch

        }//else

        // blink other LEDs randomly

        for (int LED = 0; LED < (sizeof(LEDS) / sizeof(int)); LED++) {

            if (random(40) == 1) {

                STATES[LED] = !STATES[LED];

                digitalWrite(LEDS[LED], STATES[LED]);

            }

        }

    }

    // go to a low power state

    digitalWrite(ledPin, LOW);

    pinMode(ledPin, INPUT);

    return(true);

}
2

Oops

3

can i know whats the problem is?

4

must to be ledPin or some other problems?

5

It's the '1'

1 Like
6 
  long off_time = millis() + on_time * 1000;

  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);

  while (millis() < off_time)
  {

This should be:

  unsigned long start_time = millis();

  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, HIGH);

  while (millis() - start_time < on_time * 1000)
  {

Always subtract a start time from the current time to get an elapsed time. Otherwise, things go bonkers when the timer rolls over after 4.2 billion milliseconds.

1 Like
7

thank you very much

8

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