I want to drive a passive peizo buzzer from an ESP32. I have found schematics on how to drive one of these from a 5v Arduino board, but not for the ESP32 that runs at 3.3v. I don't want to burn out my ESP32 so I'm looking for a schematic on how to connect it. Can I connect it directly? Do I need a …

Okay, I hooked it up then used a minimal program to generate a tone: const int duration = 500; const int middle_c = 440; void setup() { } void loop() { tone(13, middle_c, duration); delay(duration); } This code does not compile when the board is set to Heltec_WIFI_Kit_32 (ESP-32) but doe…

The tone function uses PWM to generate the signal. PWM is generated by hardware timers in the processor. The arrangement, hardware address and function of these timers are very different in the two processors, that is why tone will not work on your processor. Fortunately the software tells you this…

You add extra code to the tone library, a task I think that is beyond you with your current state of knowlage. Without looking in detail at the processor you have, I am not even sure if this is possible. There is no way to know a person's level of knowledge on these forums, so I don't have any pr…

Well the cue I picked up on was:- I have found schematics on how to drive one of these Now you don’t “find” a schematic if you know anything about hardware. Hence my assumption you were a beginner, sorry. Without knowing the details of the exact buzzer you use it is hard to tell if you need a t…

Now you don't "find" a schematic if you know anything about hardware. Hence my assumption you were a beginner, sorry. No problem. In these forums, we really don't know each other or each other's abilities. I dabble in hardware, but I've been dabbling since high school electronics class. Since I d…

Okay, I used Ohm's Law to calculate the needed resistance. The maximum drive current from any GPIO pin on the ESP-32 is 12 ma. R = V/I, but I'll spell them out; Resistance = Voltage/Current = 3.3 v/12 ma = 275Ω I can't find a part number on the piezo buzzer, but I've seen places that use 8Ω. 220Ω…

What is this about the capacitance of the buzzer? Do you mean resistance? No. While the resistance of a piezo is very high, it has capacitance. When you feed AC through a capacitor you get a current which depends on the frequency and the capacitance value. It is a lot more complex than this as y…

Val42: I can't find a part number on the piezo buzzer, but I've seen places that use 8Ω. 220Ω resistor with the piezo is a little low. That value makes the buzzer much quieter. You may be confusing a speaker with a piezo buzzer?

While searching for a better solution for my original problem, I came across ESP32 Arduino: Controlling a buzzer with PWM . In summary, even though the ESP-32 libraries don't have a tone(), they do have other functions that will let you do the equivalent. #define BUZZER_PIN 13 #ifdef AR…

ESP32 passive peizo buzzer

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DVDdoug December 5, 2018, 9:52pm 2

It should be safe but if you're paranoid put a ~200 Ohm resistor in series.

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ESP32 passive peizo buzzer

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