How To Add Buzzer To Your Meshtastic Node

In this guide, we'll walk you through adding a buzzer to your existing ESP32 Lora Meshtastic Node. This guide will work also for any other ESP32-based board like Heltec V3 Lora, TTGo, or T-Beam but slight changes might be required.

Hardware

Now let's get started with the hardware you need:

1x Buzzer - AliExpress Price: 0.69 USD | Amazon US Price 7.99USD
2x Female to Female Pin Connector AliExpress Price: 0.42USD | Amazon US Price 5.49USD

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When ordering from AliExpress, consider consolidating your purchases from a single seller to maximize savings. For instance, if you're purchasing an antenna from seller X, check if they also offer an IPEX to SMA-K cable. By sourcing all your items from one seller, you can significantly reduce shipping costs.

Assembly

The hardware is all ready and set now to the wiring. For this, we will follow the following Schematics.

Buzzer - DIY ESP32 Meshtastic Node

Positive -> GPIO 15
Negative -> GND

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If you're using a different ESP32-based board like Heltec V3 Lora, TTGo, or T-Beam, simply select an available GPIO pin that accepts digital signals, supports pull-up or pull-down resistors, and isn't already in use. Then, follow the guide using the chosen pin, disregarding the specific pin number mentioned in the instructions

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Capacitors are good practice for decoupling one part of a circuit from another

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It's Important To Note That The Order Of The Connections Might Vary. Follow The Labels And Io Ports On Your Specific Components And The Provided Schematics To Ensure Accurate Wiring. Paying Attention To These Details Ensures That You Establish The Correct Connections And Avoid Potential Issues or Damaging Your Components

Once all the wiring is completed. Double-check your connections and ensure they match the suggested layout before proceeding to the next steps.

Meshtastic Settings

Open Meshtastic App (IOS for this guide)
Go to the Settings page
In the module configuration section go to External Notification
Toggle the switch to enable Enable, Alert when receiving a message, Use PWM Buzzer
Scroll down then Primary GPIO toggle Active then set the output pin GPIO to Pin 15
Now go to the Settings page then Ringtone and set your desired ringtone

Here is an example

Halloween:d=4,o=5,b=180:8d6,8g,8g,8d6,8g,8g,8d6,8g,8d#6,8g,
8d6,8g,8g,8d6,8g,8g,8d6,8g,8d#6,8g,8c#6,8f#,8f#,8c#6,8f#,8f#,
8c#6,8f#,8d6,8f#,8c#6,8f#,8f#,8c#6,8f#,8f#,8c#6,8f#,8d6,8f#

0:00

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In conclusion, enhancing your DIY ESP32 Meshtastic Node with a buzzer is a simple and enjoyable process. By carefully following the provided guide, which includes a list of required hardware and step-by-step instructions, users can seamlessly integrate a buzzer into their existing setup. The hardware assembly, including the buzzer and pin connectors, is clearly outlined, ensuring a smooth implementation.