ESP32 + 3.5 Inch LCD (the one the Raspiblitz uses) LND node monitor. Keep your node locked down somewhere safe, but still have an easy way to check its status!
## BTCIOT Tutorial: The Muffin Man LND Node Monitor - Summary
This podcast episode provides a tutorial on building a custom, glanceable monitor for a Lightning Network (LND) node using an ESP32 microcontroller and a small TFT LCD screen, affectionately dubbed "The Muffin Man." The project aims to create a secure and convenient way to monitor node status, generate invoices, and even accept donations, all while allowing for airgapping of the screen from the node itself for enhanced security. The tutorial walks listeners through the hardware and software requirements, configuration steps, and code overview, emphasizing the simplicity of the project despite its useful functionality. The host highlights the cost-effectiveness of the build, noting that the core components can be acquired for just a few dollars.
The device displays essential node information, including a QR code for the node ID and the ability to generate invoices via QR code. The user interface is built using the LVGL library, providing a visually appealing and interactive experience. A key feature is a prominent red message box that alerts the user if the node is disconnected, prompting an automatic reconnection attempt. The tutorial also covers configuration details, including Wi-Fi credentials, node address, and the potential need for a TLS certificate for secure communication with the LND node. Finally, the host offers suggestions for enclosure and organization to create a polished and functional device.
Main Topics Discussed:
- Project Overview: Introduction to "The Muffin Man" and its purpose as an LND node monitor.
- Hardware Requirements: ESP32 Node 32S, 3.5-inch TFT LCD screen, jumper cables.
- Software Requirements: Arduino IDE, ESP32 board support, LVGL library, TFT library, Arduino JSON library, Wi-Fi Client Secure library, QR Code library.
- Functionality: Node ID display (QR code), invoice generation (QR code), donation acceptance.
- Configuration: Wi-Fi credentials, node address, TLS certificate (optional).
- Reverse SSH Tunnel: Utilizing Engrock for external access.
- Code Structure: Overview of code utilizing libraries for screen display, JSON handling, Wi-Fi connection, and QR code generation.
- User Interface: Home screen (node info), Node ID QR code, Invoice QR code.
- LVGL Configuration: Modifying `LVConf` file for pin assignments.
- TFT ESPI Library: Installation and driver selection.
- Enclosure & Organization: Suggestions for housing and wiring.
Key Quotes:
- "Nothing so exalted on the face of God's great earth as that prince of foods. The muffin." (Humorous intro)
- "I want to keep my nose somewhere secure, but I still want to have a screen which I can quickly glance to monitor my node and make sure it’s still running.”
- "It’s a $4 ESP32, so if we're extra $4, you can airgap that screen and then have your node somewhere safe and have the screen somewhere public.”
- "This is really useful because when your node goes down, you just want to kind of know there's gone down. And this visually it catches your eye if it's in the room. The red message box.”
People Mentioned:
- The host (unnamed)
- Raspberry Blitz users
Bitcoin Price:
- No Bitcoin prices were mentioned.