Get no Sound from Buzzer

[ChrisVonFrosta]

PROBLEM DESCRIPTION

an installed piezo buzzer is setup as Buzzer. If send Command Buzzer 2,3,4 i can recognize super silent knocks. but no beeps.
When set this Buzzer/Port as PWM i can contoll is channel to do beeps.
What ist to do to get the piezo buzzer works as "Tasmota's Buzzer"?

REQUESTED INFORMATION

• [x ] Read the Contributing Guide and Policy and the Code of Conduct
• [ x] Searched the problem in issues
• [ x] Searched the problem in the docs
• [ x] Searched the problem in the forum
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• [ x] Device used (e.g., Sonoff Basic): NodeMCU V3 ESP 8266
• Tasmota binary firmware version number used: 8.3.1
  • Pre-compiled
  • Self-compiled
    • IDE / Compiler used: _____
• Flashing tools used: _____
• Provide the output of command: Backlog Template; Module; GPIO 255:

  Configuration output here:

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EXPECTED BEHAVIOUR

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ADDITIONAL CONTEXT

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[arendst]

You may have a power issue with your buzzer. Depending on the buzzer voltage you may need an amplifier to use. A simple transister could do the trick.

[ChrisVonFrosta]

But it do sounds if i configure the output as pwm. So i thought it shouldn’t be a voltage issue.

[Lawrencezarb]

you probably have the wrong type of buzzer. You are using one that requires a square wave/PWM signal. You should be using one that only requires the trigger pin to go high to sound, ie a KY-012 buzzer.

[ascillato2]

Closing this issue as it has been answered.

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[ChrisVonFrosta]

I could be wrong but this is not described in the wiki anyway. Maybe a little hint could be helpfull there.

Btw. It would be a nice feature to let the buzzer output “speak” pwm beeps.

Thanks for explanation and the example.

[hello-world-dot-c]

I am working on it:
#8994

[BroBan]

@ChrisVonFrosta Could you please tell me how you setup a buzzer with the sonoff basic? Like what GPIO pins you used, did you need to add a resistor? Is the 3.3V out pin from the sonoff enough to power the active piezzo buzzer? Thanks!

[ChrisVonFrosta]

@BroBan
hard to remamber.
the result was that i use a ws28xx for indication.
But for tests my buzzer was one with intergrated transistor i think.
so it could powered 5 V and was able to switch "activ low" with gpio.
But u need one which work without pwm signal.

[Bobatwork]

Found this thread when searching myself. You can use the PWM Buzzer, just do setoption111 1. Works like a charm.
If you need more voltage than 3.3V from your ESP, you can use an NPN transistor, with a approx. 220Ohm resistor before the base and a flyback diode across the buzzer, if you really want to get serios about it.

[ozett]

stumbled into the same problem as thread-starter described.
would be glad to find solution to use such a "buzzer" as pwm-buzzer with tasmota-cmd..

edit: found an example in the issueshere
#8994 (comment)

maybe this is documented anywhere else?

[thomas374b]

I had the same Problem and I dug deeper.

It seems to be that the function
analogWrite(pin, duty);
in method
BuzzerSet()
in file
xrdv_24_buzzer.ino
is wrapping the duty to 8 bits.

I verified it with a scope and customized self-compiled firmware
with
duty := 254 I get sound with a 8µs long L-Pulse
duty := 255 I get nothing, but one click
duty := 256 I get nothing, but one click
duty := 257 I get sound with a 4µs long H-pulse

The argument in the original code id pwm_range/2. But pwm_range is 1023 and 511 folded to 8bit is 255
Thats why, the buzzer is only silent clicking instead of buzzing

I reworked the buzzer code already for me and added some alarm-noise patterns with changing frequencies and allowed
the user to change frequency and duty (for loudness) via extra commands.
The code is all ready but not yet under git control.

I might give you a pull request if I find the time to cleanup and checkin.