BlueFlyVario with the Sick of Beige DP5031 case

in Sick of Beige by DP | 3 comments

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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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Comments

  1. Alan says:

    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. langwadt says:

    mercury is about 10000 times denser than air, so I guess somewhere around 0.01 mm

  3. Alan says:

    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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