rvl-display

a custom hardware to monitor system sensors via 1.8" TFT LCD, powered by a Raspberry Pi Pico and communicating with a host application via USB HID.

Hardware

• Controller: Raspberry Pi Pico Zero (RP2040-zero).
• Display: 1.8" 128x160 TFT LCD (ST7735S).
• Connection: Direct mainboard USB 9 Pin 2.0 header
• VID:PID: 0x5EED:0xFACE (denolk rvl-display)

Project Structure

rvl.display firmware

• rvl.device.fw/: PlatformIO project for the Raspberry Pi Pico firmware.
• Uses main.cpp for HID communication and display rendering.
• Configuration is defined in platformio.ini.
• UI layout: https://lopaka.app/gallery/28702/59717
• 

rvl.host.service windows service

• rvl.host/Service/: Windows Service that runs in the background to stream sensor data.
• Communicates with the device via USB HID and exposes a netpipe for cli app.
• Uses LibreHardwareMonitor to read system sensors and sends updates to the device.

rvl.host.cli command-line interface

• rvl.host/Cli/: Console application for manual control and testing.
• Connects to the service's netpipe to send commands and receive status updates.
• Provides a simple tui for interacting with the device
• 

Build

On Windows, install the .NET 10 SDK and PlatformIO, then run:

.\build.ps1

The script builds the host CLI, Windows service, and Pico firmware. Outputs are written to:

• dist/cli/
• dist/service/
• dist/firmware/rvl-display.uf2

Use -Configuration Debug for debug host builds:

.\build.ps1 -Configuration Debug

Build only one target with -Target:

.\build.ps1 -Target cli
.\build.ps1 -Target service
.\build.ps1 -Target firmware

The default target is all. Individual target builds only replace their own folder under dist.

TODO

• add cpu, gpu fan sensors to display
• 3D print a custom case
• spi dma to lcd
• sprite rendering for lcd
• display temp colors based on thresholds