Difference between revisions of "Piezo Speaker"
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= How to control it in MicroPython = | = How to control it in MicroPython = | ||
| + | |||
| + | == Basic code to generate a 500 Hz signal == | ||
| + | <syntaxhighlight lang="python" line='line'> | ||
| + | from machine import Pin | ||
| + | from time import sleep, sleep_us, sleep_ms | ||
| + | |||
| + | # assume our speaker is connected to Pin 27, we use it as output | ||
| + | myLED = Pin(27, Pin.OUT) | ||
| + | |||
| + | #generate a 500Hz on/off signal | ||
| + | while True: | ||
| + | # this switcheson for 1ms = 1000 us | ||
| + | myLED.on() | ||
| + | sleep_us(1000) | ||
| + | # this switches off for 1 ms = 1000 us | ||
| + | myLED.off() | ||
| + | sleep_us(1000) | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | == Code to play a melody - decoding notes == | ||
Example code shows how you can play a melody with the speaker. If you want to add higher notes see https://en.wikipedia.org/wiki/Piano_key_frequencies for the needed frequency. The example code was taken and edited from https://micropython-on-esp8266-workshop.readthedocs.io/en/latest/basics.html#beepers. | Example code shows how you can play a melody with the speaker. If you want to add higher notes see https://en.wikipedia.org/wiki/Piano_key_frequencies for the needed frequency. The example code was taken and edited from https://micropython-on-esp8266-workshop.readthedocs.io/en/latest/basics.html#beepers. | ||
| − | There are some issues with restarting PWM | + | There are some issues with restarting PWM outputs - see [[Known Issues]]. |
<syntaxhighlight lang="python" line='line'> | <syntaxhighlight lang="python" line='line'> | ||
| Line 51: | Line 71: | ||
= Related Tutorial Videos = | = Related Tutorial Videos = | ||
<youtube>HPQMvL1SP_c</youtube> | <youtube>HPQMvL1SP_c</youtube> | ||
| + | |||
| + | [[Category:Actuators]] | ||
Latest revision as of 09:31, 14 June 2024
Contents
Description[edit]
A Piezo-Speaker has two connectors and can generate sounds if you apply a frequency. One is + and one is -. If you connect it to the ESP + is connected to the Pin and - to GND. With the speaker in the LMUBox the long Pin is +.
How to connect it electrically[edit]
How to control it in MicroPython[edit]
Basic code to generate a 500 Hz signal[edit]
1 from machine import Pin
2 from time import sleep, sleep_us, sleep_ms
3
4 # assume our speaker is connected to Pin 27, we use it as output
5 myLED = Pin(27, Pin.OUT)
6
7 #generate a 500Hz on/off signal
8 while True:
9 # this switcheson for 1ms = 1000 us
10 myLED.on()
11 sleep_us(1000)
12 # this switches off for 1 ms = 1000 us
13 myLED.off()
14 sleep_us(1000)
Code to play a melody - decoding notes[edit]
Example code shows how you can play a melody with the speaker. If you want to add higher notes see https://en.wikipedia.org/wiki/Piano_key_frequencies for the needed frequency. The example code was taken and edited from https://micropython-on-esp8266-workshop.readthedocs.io/en/latest/basics.html#beepers.
There are some issues with restarting PWM outputs - see Known Issues.
1 # beeper code from https://micropython-on-esp8266-workshop.readthedocs.io/en/latest/basics.html#beepers
2 from machine import Pin, PWM
3 from time import sleep
4
5 tempo = 4
6 #notes and corresponding frequency
7 tones = {
8 'c': 262,
9 'd': 294,
10 'e': 330,
11 'f': 349,
12 'g': 392,
13 'a': 440,
14 'b': 494,
15 'C': 523,
16 ' ': 0,
17 }
18 pin = Pin(27, Pin.OUT)
19 # Init Beeper without frequency.
20 beeper = PWM(pin, duty=512)
21 melody = 'cdefggaaaagaaaagffffeeddddc'
22 rhythm = [8, 8, 8, 8, 4, 4, 8, 8, 8, 8, 4, 8, 8, 8, 8, 4, 8, 8, 8, 8, 4, 4, 8, 8, 8, 8, 4]
23
24 for tone, length in zip(melody, rhythm):
25 beeper.freq(tones[tone])
26 sleep(tempo/length)
27
28 beeper.deinit()
Related Tutorial Videos[edit]
