A new variation of the Arduino Fade sketch
Devices and components
Arduino Uno Rev3
DC piezo buzzer
Software and tools
Arduino IDE
Project description
Hardware Description:
Software overview:
Failure:
Addendum:
Modified fade sketch
1/*
2 Fade
3
4 This example shows how to fade an buzzer on pin XX
5 using the analogWrite() function.
6
7 The analogWrite() function uses PWM, so if
8 you want to change the pin you're using, be
9 sure to use another PWM capable pin. On most
10 Arduino, the PWM pins are identified with
11 a "~" sign, like ~3, ~5, ~6, ~9, ~10 and ~11.
12
13 This example code is in the public domain.
14 */
15
16/*
17 * following cut from https://playground.arduino.cc/Main/TimerPWMCheatsheet
18How to adjust Arduino PWM frequencies by macegr in this forum post http://forum.arduino.cc/index.php?topic=16612#msg121031
19
20Pins 11 and 3: controlled by timer 2 in phase-correct PWM mode (cycle length = 510)
21
22Setting Divisor Frequency
230x01 1 31372.55
240x02 8 3921.16
250x03 32 980.39
260x04 64 490.20 <--DEFAULT
270x05 128 245.10
280x06 256 122.55
290x07 1024 30.64
30
31TCCR2B = (TCCR2B & 0b11111000) | <setting>;
32
33All frequencies are in Hz and assume a 16000000 Hz system clock.
34
35*/
36
37int buzzer = 11; // the PWM pin the buzzer is attached to
38int volume = 0; // how loud the buzzer is
39int fadeAmount = 5; // how many points to fade the buzzer volume by
40
41int duty_cycle = 127; // 0-255 so 50% = 127 approx
42
43int setting=0x01;
44
45// the setup routine runs once when you press reset:
46void setup() {
47
48 TCCR2B = TCCR2B & 0b11111000 | setting;//to adjust divider for timer
49
50 // declare buzzer pin to be an output:
51 pinMode(buzzer, OUTPUT);
52}
53
54// the loop routine runs over and over again forever:
55void loop() {
56 // set the volume of pin 9:
57 analogWrite(buzzer, volume);
58
59 // change the volume for next time through the loop:
60 volume = volume + fadeAmount;
61
62 // reverse the direction of the fading at the ends of the fade:
63 if (volume <= 0 || volume >= 255) {
64 fadeAmount = -fadeAmount;
65 }
66 // wait for 100 milliseconds to see the volume effect
67 delay(100);
68}
69
Note: Content and images are from: https://projecthub.arduino.cc/, with some modifications.
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