A DIY USB Rubber Ducky can be built from a small microcontroller board, but the often-repeated $3 price is a 2018 figure—not a current parts estimate. Hackaday’s 2018 project used a Digispark ATtiny85 and open-source tools, trading the commercial Hak5 device’s simpler workflow for script conversion and board flashing.
What a DIY Rubber Ducky does
A USB keystroke-injection device presents itself to a computer as a keyboard and sends programmed input. That makes it useful for authorized security testing and controlled demonstrations, but it is not permission to interact with another person’s computer. Use one only on devices you own, in a lab, or in an explicitly approved assessment; Hak5 likewise describes its product in the context of authorized auditing and security analysis.
The name “Rubber Ducky” is commonly associated with Hak5’s commercial USB device. A DIY project can reproduce the basic idea of programmed keyboard input, but that does not make it the same product or guarantee it supports the same scripts and features.
What the 2018 DIY build involved
Digispark ATtiny85 and a conversion step
Tom Nardi’s September 17, 2018 Hackaday article used a Digispark ATtiny85 development board as the core of the DIY build. The process was not simply installing Hak5 firmware on any inexpensive board: the article describes using duck2spark to convert a Rubber Ducky script into a binary, then flashing that binary to the Digispark.
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That extra conversion-and-flashing workflow is the important practical distinction. Hackaday contrasted it with placing a script on the commercial device’s microSD card, a more convenient workflow as described in that 2018 article. The article’s instructions and software context are historical; they should not be assumed to describe current board availability or current software behavior.
Historical prices, not current shopping guidance
| Item or claim | What Hackaday reported in 2018 | How to read it now |
|---|---|---|
| DIY build | About $3 per unit | A reported 2018 build cost, not a current parts total. |
| Hak5 USB Rubber Ducky | $45 | A reported 2018 comparison price, not a current retail price. |
| Digispark clone | As low as $1.50 | A historical listing observation; variants and present-day prices may differ. |
| Official Digispark board | $8; Hackaday noted it was unavailable at the time | A historical listing observation, not a current price or availability claim. |
Hackaday also reported that the device could enter text at more than 1,000 words per minute. Treat that as a claim reported in the article, not as an independently verified or comparable performance benchmark. The article did not establish a controlled speed comparison between the DIY board and Hak5’s device.
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- solid, and good
- Badusb, USB, virtual keyboard, memory
- Initialization, card initialization, failure, to, check:
- Yes, a, card, plugin
- Is, a, card, inserted?
DIY versus the commercial Hak5 device
The choice is mainly about workflow, documentation, and compatibility—not just a sticker price. The historical DIY setup aimed to reduce hardware cost, while the commercial product offered a more direct script workflow. Current Hak5 documentation also makes clear that DuckyScript compatibility varies by version and device.
| Consideration | DIY Digispark approach in the 2018 article | Hak5 commercial approach |
|---|---|---|
| Up-front cost | About $3 per unit, as reported by Hackaday in 2018; not a current estimate. | $45, as reported by Hackaday in 2018; not a current price. |
| Payload workflow | Convert the script with duck2spark and flash the resulting binary, according to the 2018 article. | Hackaday described putting a script on the device’s microSD card; current supported payload format depends on the specific device and documentation. |
| Documentation and support | The cited article documents one DIY method; it does not establish commercial product support. | Hak5 provides official product and DuckyScript documentation. |
| Script and feature compatibility | Not established as feature-identical to Hak5’s product. | Hak5 documents version- and device-specific compatibility. |
Hak5’s official DuckyScript Quick Reference describes the language across Hak5’s USB Rubber Ducky and other supported products, with compatibility dependent on version and device. Its payload repository distinguishes the newer USB Rubber Ducky’s compiled inject.bin payloads from interpreted scripts used by some other devices. That variation is why a script written for one device or language version should not be presumed to work unchanged on a Digispark build.
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- Badusb, USB, virtual keyboard, memory .
- Initialization, , card ... initialization, failure, , to, check:Yes, a, card, pluginIs, a, card, inserted?Is, your, wiring, correct?Did you change the chipSelect pin to your shield or module?
- Initializing, , card... Wiring, is, correct, and, a, card, is, present.
- Card Type: SDHCThe type is FAT32Volume size (bytes): 3519021056Volume Size (): 3436544Volume size (Mbytes): 3356File, find, on, the, card (name, date and size, in, bytes)
- Package includes:1 x Virtual Keyboard Module,1 x Pin Header
Other DIY routes, including Raspberry Pi Pico
A separate 2022 project by Craig Wilson documents a Raspberry Pi Pico HID keyboard approach, reusing DuckyScript syntax and adding an external trigger intended to help prevent accidental execution. It is an example of another DIY implementation, not evidence of a standardized, broadly compatible product or a drop-in Hak5 replacement. See the PicoProject – Ducky project for its specific implementation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which route makes sense?
- Choose a DIY project if your goal is learning how USB keyboard emulation works, you are comfortable with board-specific tools, and you will verify compatibility for the exact hardware and software you use.
- Choose the supported commercial workflow if official documentation and a documented device-specific payload process matter more than reproducing the low historical cost.
- Do not choose based on the old $3-versus-$45 comparison alone. Those figures describe Hackaday’s 2018 report and cannot establish current costs or value.
For the historical build, the relevant part category is a Digispark ATtiny85 development board; current board variants and listings may differ from those in the article. Hak5’s USB Rubber Ducky product page is the source for its current product description and official learning materials. Check the specific board, device, and documentation before relying on a particular script workflow.
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