Boating and Arduino enthusiast Dave has released another interesting and useful project that's great for small boat users - his "ArduKnot" speedometer. Any avid mariner in busy canals, rivers or canals knows of the speed restrictions and the wrath brought upon by those who notice excessive speed - and this project solves the problem by displaying the speed in knots using large, bright LED display modules. The system simply reads speed data from a GPS receiver, converts it to knots and displays this on the LED numbers using a MAX7219 LED display driver. Once fitted in a weatherproof enclosure, it looks quite the part:
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