BlueFlyVario with the Sick of Beige DP5031 case

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Alistair Dickie shows off his BlueFlyVario in a Sick of Beige DP5031 translucent blue custom case:

The BlueFlyVario is a flight instrument for measuring vertical speed and altitude based on atmospheric pressure. It consists of a simple hardware device that measures the atmospheric pressure 50 times every second, with a resolution that enables the measurement of altitude differences as small as 10 cm. An Android application connects to the device via bluetooth to provide a detailed display. The application is highly customizable.

Sick of Beige v1 DP5031 project case is available at Seeed for $3.

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3 Comments

  1. 10cm height differences? How does that compare to millimetres of mercury (mmHg)?

    I’m more interested in a barometric weather station, than a flying device that needs to stay within Bluetooth range.

  2. Actually, the USA uses inches of mercury, and the rest of the world uses millibars. At sea level, the standard is about 29.9 inches mercury, or 1013mbar (wikipedia: atmospheric pressure). Pressure drops by about 1 inch (33millibars) per 1000ft in altitude, so by my math this can detect a change of:
    3.3×10^-5 inch mercury, or 1.11×10^-3millibars.

    This sensor can detect even mild weather variations. An approaching storm is signalled by a drop in air pressure. More to the point, you can measure pressure as much as you want – but without a ground-level reading you won’t know how high your sensor is.

    In flying, that base reading is broadcast as QNH.

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