huVVer AVI Instruments

Arduino Compatible Programmable Aircraft Instrument



The huVVer-AVI™ is a general-purpose customizable aircraft instrument that uses the Espressif Systems ESP-32 microprocessor. Instrument source code is open source and provided for the popular Arduino platform, ensuring long-term support and enhancements from developers world-wide.

Created for experimental aircraft applications, the huVVer-AVI provides a bright 2.4 inch (61 mm) LCD screen, dual RS-232 serial ports, a CAN bus interface, two relay or lamp drivers, two sensor inputs, a pair of stereo audio outputs, and four front-panel pushbuttons that fits into a standard aircraft 2.25” or 3.125” panel cutout. Operating at input voltages from 8 to 35 volts, and withstanding voltage surges of up to +/- 100 volts, the device is ideally suited to aeronautical applications.

Arduino ( is an open-source hardware/software integrated development environment (IDE), originally created as an educational tool. It has been widely adopted by small to medium sized companies as the platform of choice for quick-turn development of custom microcontroller applications. Developers worldwide support the millions of Arduino users, providing readily available, low cost hardware and open-source software.

The huVVer-AVI family was developed to be production-ready prototyping systems. Fully compatible with the Arduino or Espressif IDE development environments, it provides robust power conditioning and multiple levels of protection from electrostatic discharge, over voltages, and short circuits. The devices fit into standard aviation 2- inch or 3-inch circular instrument cutouts.

Currently, the huVVer-AVI devices require an external Dynon SkyView, Garmin G3X, or Garmin G5 system to provide reliable air, system, and engine data. Future enhancement will use other data sources (both wired and wireless) to provide more flexibility. Of note, MakerPlane and OnSpeed ( are developing precision ADAHRS systems that will be supported by the huVVer-AVI devices.


Basic Installation

Using the wiring standards defined in FAA publication AC43.13, connect the huVVer-AVI device to aircraft power. Each unit can draw up to 500 mA of peak current, so 22 AWG wire and a 5 Amp fuse or breaker is adequate. Several devices may share one circuit.

Connect Serial Port 2 input (Connector A, pin 4) to any available serial port output from a Dynon SkyView, Garmin G3X, or Garmin G5 system, using their recommended techniques. For short distances (less than two metres or 6 feet), unshielded wire is acceptable. In addition to power and ground, only the serial input is used for basic operation. The serial output may be ‘daisy-chained’ to other huVVer-AVI devices, if desired.
The EFIS serial port (if used) must be configured to 115200 bits per second and ADAHRS, (SYSTEM) and EMS output. (Note: Garmin does not support the SYSTEM output mode).

If a WiFi connection to the Dynon SkyView is desired, a Dynon WiFi Adapter must be installed on each SkyView EFIS in your system. Currently, the huVVer-AVI software must be customized for the WiFi credentials of your system. This requires you to modify, compile and load new programs on the huVVer-AVI device. Instructions for this procedure are included in the open-source device software. Your avionics installer may be able to assist.

Instrument Installation Dimensions

The following diagrams show the engineering drawings for the two types of cases available.  The AVI-3 for a 3.125″ instrument cutout is recommended for flush mounting only. The AVI-2 for a 2.25″ instrument cutout is recommended for face mounting only.  


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