Varduino QT+


Ultra sensitive no-lag time variometer combining an ultra-sensitive pressure sensor and an Inertial Measurement Unit (IMU, accelerometer, gyroscope, magnetometer). 1.5inches e-ink display with great outdoor visibility for vario information.

Can be connected through Bluetooth or USB to Android and iOS smartphones to run with XCSoar, Flyskyhy, XCtrcack and others.

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E-ink display for amazing outdoor visibility

Thanks to its 1.5' e-paper display the Varduino QT+ offers amazing outdoor visibiilty compared to classical LCD displays, moreover in a small form factor.

The QT+ is a variometer with all necessary functions to get started in thermals flying or when a small device is necessary. The following informatons are shown:

  • Time and flight duration
  • Barometric altitude
  • Vertical speed
  • Max and Min vertical speed


Lightweight and ultra-sensitive variometer

The Varduino QT variometer combines an ultra-sensitive pressure sensor (10cm resolution, 50 measurements/second) and an advanced signal filtering algorithm to provide the user with an unprecedented reactivity.

A 1W speaker with class-D amplifier is built-in for more natural vario sounds and voice notifications.

It is moreover very compact and lightweight and will be the perfect variometer to assist you during hike-and-fly or to be combined with your smartphone

Bluetooth and USB-OTG communication

The variometer can be connected to iOS and Android phones through Bluetooth. Android and iOS. Le varduino QT+ est équipé d’une puce Bluetooth 4.2 à faible consommation ainsi que d’un convertisseur USB reconnu par les logiciels Android

The most popular applications are compatible, such as:

  • XCtrack
  • XCSoar
  • Flyskyhy

Pressure data are transmitted via Bluetooth. Many data formats are available and can be configured using Varduino Manager.


The Varduino QT+ features a 1200mAh LiPo battery with a flight autonomy of about 40h at maximum volume. The battery can be charged from USB and the charge status is updated on the display even when the device is off.


The Varduino QT+ is fully compatible with Varduino Manager. Its sound profile as well as all settings can be easily configured from your computer.

Additional Information

Weight 51 g
Dimensions 64 × 44 × 15 mm


Software featuresVarduino QT+
Ultra-sensitive variometer
Sound notificationsVoice, buzzer
Flight tracklogAltitude and vario
Tracklog intervalMax 1point/second
Max recording>50 hours at 1 point/second
Cross country navigation-
Flight start detection
Communication with iOS appsFlyskyHy
Communication with Android appsXCSoar, XCTrack, FlyMe
Bluetooth communcation
USB communicationXCSoar, XCTrack
Display data fieldsBattery state
Bluetooth status
Flight time
Pressure altitude
Min vario
Max vario
Volume settings4 levels
Vertical speed smoothing configuration
GPS speed smoothing configuration
Direct configuration form Varduino Manager
Sound profile configuration from Varduino Manager
Custom rescue alarm
UnitsMetric, imperial
LanguageEnglish, French
Technical features Varduino QT/QT+
Pressure sensor50 recordings/seconds
MicroSD card-
Wireless communicationBluetooth 4.2, WIFI
Autonomy>40 hours
Display typee-ink (QT+ only)
Display size1.5 pouces (QT+)
Resolution200x200 pixels (QT+)
Display refresh rate2 seconds
Case type3D printing - PETG
Size (L x W x T) 64 x 44 x 15mm