You can use an Arduino Nano to control a vacuum fluorescent display (VFD), but a bare tube cannot be connected directly to the Nano’s GPIO pins. The Nano handles logic and timing; a driver circuit and tube-specific supplies handle the filament, grids, and anodes. If you have a VFD module with its own controller, the Nano may instead communicate with that module over its documented interface.
First identify what kind of VFD you have
“VFD” can also mean variable-frequency drive; this guide is about vacuum fluorescent display tubes. The key distinction is whether your part is a bare glass tube or a controller-equipped display module.
Bare tube
A bare VFD typically has a heated filament (cathode), one or more control grids, and phosphor-coated anodes or segments. These electrodes need electrical drive conditions matched to the specific tube. The Nano supplies control signals and scan timing, not the power to operate the tube electrodes.
Controller-equipped module
A module with integrated display electronics can accept commands through an interface such as serial and manage the tube internally. In Arduino’s account of a salvaged Epson POS display, the Nano sent commands to the module rather than directly switching its display electrodes: Arduino’s Epson VFD project. Confirm the module’s own supply requirements, connector pinout, and command protocol; bare-tube wiring does not apply.
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Choose a drive architecture
For a bare tube, select a driver approach only after identifying the exact tube and checking its documentation. These project examples illustrate different architectures, not interchangeable circuits.
| Approach | What it does | What to check |
|---|---|---|
| Controller-equipped module | The module accepts serial commands and drives its display internally, as in the Epson example. | Module supply, connector, interface voltage, and command protocol. |
| Integrated VFD driver | A serial-input driver switches anode or grid outputs. Microchip describes the HV5812 as a 20-channel VFD driver. | Output count and ratings, logic compatibility, tube wiring, and separate filament-supply needs. |
| Discrete multiplexed driver | Shift registers and transistor stages switch the display while firmware scans the grids and changes segment data. See the Arduino Project Hub controller example. | Channel count, component ratings, scan timing, and what happens if the firmware stops refreshing. |
| Discrete static drive | A documented IV-11 clock uses a shift register and high-voltage source driver for each tube rather than multiplexing. See the IV-11 VFD Tube Clock project. | Parts count, wiring, power, board area, and the trade-off between static drive and multiplexing. |
Verify the tube and electrical limits before wiring
Find the exact model number and obtain its original or otherwise authoritative datasheet. Verify its pinout, filament rating, grid and anode ratings, and permitted operating conditions. VFD tubes vary, so a circuit that works with one model is not a safe specification for another. If the tube is unidentified or you cannot establish its ratings, do not guess at a wiring recipe or supply voltage.
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The filament supply and the grid/anode drive are separate design requirements. Published projects use values such as 1.2 V or 1.5 V for a filament supply and 24 V or 25 V for an electrode rail in particular implementations; those figures are not universal VFD requirements. For example, the IV-6 Arduino Nano project reports a 24 V segment/grid rail and a lower filament supply for its own design. Do not transfer those values to another tube without checking its documentation.
Do not connect tube electrodes directly to Nano GPIO. Choose switching components for the tube’s voltage and current, the circuit’s polarity, and whether each stage must source or sink current. The classic Arduino Nano is a logic controller; do not silently assume that voltage and logic details are the same for Nano Every, Nano 33, or another board in the Nano family.
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Using the HV5812
Microchip describes the HV5812 as a 20-channel serial-input driver for VFD anode or grid data. Its datasheet specifies a recommended VPP operating range of 20–80 V, and recommended VDD of 4.5–5.5 V (Microchip datasheet, DS20005629A, copyright 2016). These are IC operating conditions—not ratings for your tube, a guarantee of compatibility, or a complete power-supply design. Check the driver’s datasheet alongside the tube’s.
Plan multiplexing and firmware behavior
In a multiplexed design, the driver activates one grid at a time and presents that digit’s segment pattern. It then moves to the next grid and repeats the scan quickly enough for the display to appear steady. The Arduino Project Hub controller example describes scanning grids while updating segment data.
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The scan is part of the display’s operating behavior, not a one-time setup. The controller example warns that if the microcontroller halts, scanning can freeze on a selected grid. Design firmware so the refresh continues reliably, and consider how your circuit behaves during reset or a software fault. Do not assume that a stopped scan automatically turns every electrode off.
Build in a safe order
- Identify the hardware. Determine whether you have a bare tube or an integrated module, and record the exact model and pinout.
- Read the relevant documentation. For a bare tube, establish filament and electrode ratings and drive conditions. For a module, establish its supply, interface, and command protocol.
- Select the driver and supplies. Check component voltage and current ratings, logic compatibility, output count, and whether the design uses static drive or multiplexing. Design the filament and electrode supplies for the selected tube rather than borrowing example values.
- Wire the Nano to the logic interface. Keep Nano GPIO on the driver or module’s documented logic inputs; do not use it to power the bare tube electrodes.
- Test the control path and display operation. Confirm serial commands for a module, or verify grid scanning and segment updates for a multiplexed bare-tube design. Check reset and halted-firmware behavior as well as normal operation.
What the project examples can—and cannot—tell you
The cited projects demonstrate that both multiplexed and static-drive circuits have been built, and that a salvaged controller-equipped module can be controlled separately from its tube electrodes. They do not establish one best circuit, universal supply voltages, or a current source for a particular tube. Component choices, brightness and duty-cycle needs, tube pin count, and build complexity all depend on the actual display and design.
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