How to Add a Buzzer to Your Heltec T114 Node

Enhancing your Heltec T114 node with a buzzer is a simple yet effective way to add audible alerts for notifications, alarms, or message alerts. This guide will walk you through the necessary steps to integrate a buzzer into your setup, ensuring seamless functionality.

Required Components

Before starting, gather the following components:

Component	Quantity	Purchase Link
Passive Buzzer	1	EBEE Store
Female-to-Female Jumper Wires	1 set	EBEE Store

Buzzer and jumper wires for Heltec T114 node

Step-by-Step Wiring Guide

1. Identify GPIO Pins

   • The Heltec T114 node has multiple GPIO pins, but we recommend using GPIO 15 for the buzzer.
   • Ensure the chosen pin supports PWM (Pulse Width Modulation) for better sound control.

2. Connect the Buzzer

   • Positive (Red Wire) → GPIO 15
   • Negative (Black Wire) → GND

 

1. Secure Connections
   • Double-check all connections to avoid loose wiring.
   • Use a breadboard or soldering for a permanent setup.

Configuring Meshtastic Settings

Once the hardware is set up, configure the Meshtastic software:

1. Open the Meshtastic App (Android/iOS).
2. Navigate to Settings > Module Configuration > External Notification.
3. Enable the following options:
   • Enable External Notification
   • Alert When Receiving a Message
   • Use PWM Buzzer
4. Set the Output GPIO Pin to 15.
5. Customize the Ringtone (optional).

Example ringtone configuration:

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#

Testing the Buzzer

After configuration:

• Send a test message to your node.
• The buzzer should emit a sound upon receiving the message.

If the buzzer doesn’t work:

• Verify wiring connections.
• Check if the GPIO pin is correctly assigned in the settings.

Need High-Quality Components?

For reliable buzzers, jumper wires, and other electronic components, contact EBEE at [email protected] for product inquiries and bulk orders.