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Housing for ESP32 Display - Marine Display — image 1
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Housing for ESP32 Display - Marine Display

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Small Marine Gauge - Fed by SignalK - Housing and links to hardware

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Creative Commons — Attribution — Noncommercial

A $35 helm display for wind, speed, depth and anchor watch

I wanted more screens on the boat for wind, speed/depth and an anchor alarm, without running more NMEA wiring. With some help from Claude, I built one on a 4" ESP32 touchscreen. It reads everything from the boat’s SignalK server over WiFi.

What it does

  • 7 pages you swipe through: wind (with a rotating compass), speed + depth, boat status (battery, fuel, water tanks), power and solar, anchor watch, weather (barometer trend), and system

  • Anchor watch: shows where you dropped the anchor, your swing circle and your track over the last 15 minutes. It sounds a buzzer if you drag, or if the data stops coming in. No data should never look like a calm anchorage.

  • Only needs USB-C power and WiFi: no NMEA wiring to the instruments

  • Two-minute setup: scan a QR code with your phone, pick your boat’s WiFi, and it finds SignalK by itself

  • Day / night / sleep modes, or auto, which dims at dusk based on your GPS position

  • Works from home too: mirror the boat’s SignalK to a desk display over a VPN

Hardware: Waveshare ESP32-S3 4" touch display (480×480)
AMAZON - ESP32 4" Display

Code (open source, MIT): ESP32 Marine Gauge
ESP32 Marine Gauge