Bus Pirate v4

Bus Pirate v4

SKU 102990041
34 Available
$37.15/ 1pcs+
$33.44/ 10pcs+
$31.95/ 20pcs+


Bus Pirate v4 is a universal bus interface that talks to electronics from a computer serial terminal. Get to know a chip without writing code. Eliminates a ton of early prototyping effort with new or unknown chips. Seeed Studio is the official manufacturer and supporter of the Bus Pirate project. Version 4 is the next generation Bus Pirate hardware, but it's not as stable as Bus Pirate v3.

If you're just starting out with the Bus Pirate we still recommend v3 - it's cheaper, more reliable, and has all the same major features. See a Bus Pirate v4 vs v3 comparison. Protocols 1-Wire, I2C, SPI, JTAG, asynchronous serial (UART), MIDI, PC keyboard, HD44780 LCDs, and generic 2- and 3-wire libraries for custom protocols.


  • USB interface, USB powered

  • 5volt tolerant pins

  • 0-6volt measurement probe

  • 1Hz-40MHz frequency measurement

  • 1kHz-4MHz pulse-width modulator, frequency generator

  • On-board multi-voltage pull-up resistors

  • On-board 3.3volt and 5volt power supplies with software reset

  • Macros for common operations

  • Bus traffic sniffers (SPI, I2C)

  • Transparent USB->serial bridge mode

  • 10Hz-1MHz low-speed logic analyzer

  • Custom support in AVRDUDE, Flashrom, OpenOCD

  • AVR STK500 v2 programmer clone

  • Scriptable from Perl, Python, etc.

  • A bootloader for easy USB firmware updates

  • Open source (CC 0/public domain)

New in Bus Pirate v4

  • 256K program space, 4 times more flash than v3

  • Integrated, on-board USB (faster)

  • Data storage EEPROM to store settings

  • Software pull-up voltage selection: 3.3volt, 5volt, or external supply

  • 2 extra I/O pins

  • Multipurpose button

  • Bus Pirate v4 vs v3 comparison

Firmware Upgrade Notification

  • If you are unsatisfied with the current firmware version, please check with the newly upgrade firmware v6.1.

  • Each Bus Pirate v4 is tested before it leaves the factory, but please keep in mind that v4 is still experimental, unproven hardware. If in doubt please buy the cheaper Bus Pirate v3, it is still manufactured and actively supported. This hardware is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

  • If you encounter any problems when using this product, here is the forum from which you can get the technical support.

Technical Details

Dimensions0mm x 0mm x 0mm
WeightG.W 13g    

Part List

Bus Pirate v41




Questions and Answers

The message about v4 being not fully developed yet has been there for years! Has it been abandoned? Neither wanting to buy something that is about to be obsoleted nor wanting to learn on something that doesn't quite work yet has kept me on the fence about buying a bus pirate for years now! What gives?
on Aug 22,2018
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"Unfortunately it seems that Dangerous Prototypes have abandoned the Bus Pirate firmware development (and the Bus Pirate v4 also), despite that their official firmware has never reached a truly stable state: the quantity of bug report threads at forums, especially regarding flashrom, is a direct proof of that. In attempt to change this desperate situation around BP v4, kallisti5 has started a Bus Pirate community firmware project: to include the important fixes and clean-ups, committed by several prominent community members, that Dangerous Prototypes still did not merge to official version of firmware (as of 19.09.2016) - and to continue its' future development. Although the primary target of community is to significantly improve the user experience for Bus Pirate v4, the Bus Pirate v3 support will be maintained at all costs (despite the difficulties while compiling with the recent MPLAB XC16 compilers)" This is from the dangerous prototypes website: http://dangerousprototypes.com/docs/Bus_Pirate The new code base is still active it just isn't supported by dangerous prototypes. It can be found here: https://github.com/BusPirate/Bus_Pirate
on Sep 15,2018 08:28 AM
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To complement on the previous answer: Maybe this clarifies things (from the original dangerousprototypes deveoper): https://github.com/DangerousPrototypes/Bus_Pirate/issues/7#issuecomment-413576913 Currently there is a more up to date "Community Firmware" v7.1 for both v3 and v4 you can get from: https://github.com/BusPirate/Bus_Pirate
on Sep 20,2018 01:37 AM
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what is included?
on Feb 26,2017
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It includes 1 pcs Bus Pirate v4. thanks.
on Aug 22,2018 10:10 AM
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    Bus Pirate v4

    SKU 102990041
    34 Available
    $37.15/ 1pcs+
    $33.44/ 10pcs+
    $31.95/ 20pcs+
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