Meshtastic — Custom Phone Node Build

Introduction

Following the construction of the Meshtastic node, the next step is designing a custom case integrated with a graphene phone — enabling secure, encrypted communication without relying on telecom towers. Focus: privacy and operational security in environments where traditional networks are unavailable or compromised.

This started with a 3D model by ElevatedisScout that I found on MakerWorld. I made one, enjoyed the design, and wanted to expand on it.

Expectation management: I’m a hobbyist, not a professional 3D designer or electrical engineer. This is part of broadening skill sets.

Problem Statement

Current communication systems face vulnerabilities from EMI exposure and security weaknesses in standard protocols. Goal: develop a solution that minimizes EMI through optimized hardware and shielding while ensuring secure, encrypted communications — even in harsh or high-threat environments.

Solution

A Meshtastic device integrated with a graphene phone, offering power and data via a single cable. Powered by an onboard 1000mAh battery as backup. All non-essential comms disabled — only the radio active. Independent controls for power and GPS for high-threat environments.

Hardware

Amazon affiliate links below. I purchased enough for four complete modules.

Case Design

Inspired by ElevatedisScout’s MagSafe integration, I replaced the ring with a full magnet system. This improves connection strength and enables attachment to vehicles, drones, or any surface — useful for ad-hoc nodes in difficult terrain.

I used Tinkercad for the 3D design. Nothing fancy, but effective.

Design Notes

• Heltec slot is a snug fit with a locking clip and slotted buttons (fewer moving parts)
• Battery slot has a channel for routing wires near the switch blocks; switches have recessed mounting holes
• GPS antenna slot holds the antenna without a lock — hot glued in place
• SMA pigtail held by the nut/lock washer on exterior, recessed to keep the antenna close to the case
• GPS module mounted inside on a set screw inside the magnet
• M3 heat-set inserts pressed using a soldering iron as a press
• Labels on top: P and R for buttons; side labels: lightning bolt for power, GPS for the GPS module

3D File on MakerWorld

Printed Case

Printed on the Bambu Lab X1 Carbon with Generic Grey PLA. Plan to reprint in a stronger material for field use.

Build

1. Press inserts into the case with a soldering iron

   

2. Splice switches into the battery and GPS module power lines (power only, not ground)

   

   Also at this step: switch for the 3V3 power from the module.

3. Screw down the switches, ensuring ON orientation is consistent (it gets tight later)

4. Solder GPS power (3V3), GND, TX (47), RX (48) to the Heltec

5. Press the Heltec — with antenna wire connected — into place

6. Secure the Heltec antenna

7. Solder wires to the GPS module

8. Hot-glue the GPS antenna in its slot

   Final internals:

   

9. Screw the GPS module to the bottom of the case inside the magnet ring

   

10. Screw the bottom to the top with M3 screws

11. Glue the magnet into its slot — intentionally not fully recessed so the rubber creates a non-slip connection

Conclusion

The result is a functional Meshtastic node ready for integration with a graphene phone. Not covered here: flashing the Heltec V3 with Meshtastic firmware and disabling Bluetooth/Wi-Fi for improved security — that’s a future post.

This was a valuable learning experience: solving complex design problems, navigating a full design lifecycle, and building something aimed at being usable by others rather than just a one-off prototype.

Constructive feedback always welcome.

Resources

• Meshtastic
• MakerWorld