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World's most powerful open-source development / debugging platform. Rapidly prototype hardware solutions based on the ARM M4 Cortex 32-bit architecture. Combine with the HydraNFC or HydraFlash shields.


The HydraBus is an immensely capable, open source multi-tool for anyone interested in learning/developping/debugging/hacking/Pen Testing for basic or advanced embedded hardware.

Use it as the very capable foundation for your custom hardware tool, or pair it with the NFC Shield for an incredibly flexible and powerful NFC testing toolkit.

Functionality in a glance

Below is a non-exhaustive list of what the HydraBus brings to the table.

Fully Open Source

100% Open Source Hardware and Firmware

Active Development Community

Participate in an active, thriving community. Need help? It's here.

Portable and Capable

Develop on a platform that outperforms your needs, in a 60mm x 37mm form-factor!

Technical Specs

  • MCU ARM 32-bit Cortex M4 + FPU @168MHz & 1MB Embedded Flash
  • Two MicroUSB port (1 OTG and 1 Device/Host)
  • MicroSD slot with 4bit SD and SDIO mode support in hardware (up to 48MHz about 24MB/s)
  • All 44 I/O broken out
Firmware Functionality
  • JTAG scanner/debugger mode like JTAGulator
  • Logic Analyzer mode up to 2MHz 16chan with SUMP support
  • CAN1 or 2 (up to 2 Mbit/s)
  • SPI1 or 2 (master & slave up to 42MHz)
  • I2C (master up to 1MHz)
  • UART1 & 2 (up to 10.5Mbps)
  • ADC (up to 3.3V, can read internal Temperature, VrefInt, VBAT)
  • PWM (1Hz to 42MHz, Duty Cycle 0 to 100%)
  • GPIO up to 44 I/O configurable (PA0-15, PB0-11, PC0-15)
  • RNG (Random number generator using STM32 hardware RNG)
  • Binary Mode compatible with BusPirate BBIO

Detailed functionality

  • Virtual Serial Port access through microUSB with VT100 terminal/shell (compatible with any hardware supporting USB Virtual Serial port)
  • 2 micro USB port can be used (managed by multi-task OS), useful to test multiple protocols, gpio/adc/dac… in 2 terminal
  • Support of microSD (FAT16/FAT32) card up to 32GB
  • Multiple protocols supported (from any VT100 console through USB): ADC, DAC1 or 2, PWM, GPIO, SPI1, SPI2, I2C, 2-Wire, 3-Wire, UART1, UART2, CAN1, CAN2
Also compatible with:
  • JTAG, OpenOCD
  • BusPirate (BBIO/Bitbang)
Supports Custom Firmware
  • Micro Python (Official Version)
  • Black Magic (Official Version)

What's included

  • 1x Hydra Bus (60mm x 37mm)
  • 1x Lasercut Transparent Plexiglas Case
  • 1x Case assembly screws
Optional Accessories
  • HydraNFC Kit
  • HydraFlash (NAND Flash Programming shield)

Shipping & Packaging

  • Each HydraBus is dispatched from Europe - no need to worry about slow shipping times, import duties or damaged goods.
  • Packed in a sturdy compact box.
  • We provide world-wide shipping with express options.

If you are an educational-facility, reseller or need several units, please contact us.

HydraBus Resources

Linux Auto Build / Install Script

Product Presentation: HydraBus

HydraBus Assembly Video

HydraBus / HydraNFC Unboxing Video


Lab401's engagement is to get your orders to you as quickly as possible in a perfect condition. All packages are insured to 100% of the value, and Lab401 Delivery Protection can be used to ensure immediate re-shipment if a package is lost or damaged.

All orders are securely packaged. Premium and Express orders are further protected in an untearable polyurethane satchel, ensuring that your package is not tampered with during delivery.

To ensure privacy and reduce theft, all packages are anonymous - there is no mention of product contents or Lab401 branding on the outside of the packaging.

Shipping Options

Lab401 provides three types of shipping options:

  • Eco Delivery
  • Premium Delivery
  • Urgent Express Delivery

Eco Delivery is for available light and slim orders, particulaly cards, keyfobs and accessories. It is dispatched by La Poste (French postal system) and tracked.

Premium Delivery is our default shipping option: fast and reliable delivery via courier. Depending on the destination, Premium Delivery use UPS, DHL, FedEx, Chronopost or Colissimo.

Urgent Express Delivery uses the fastest possible delivery method possible: UPS Express, FedEx Express, DHL Express or Chronopost Express.

Lab401 provides same day shipping for Urgent Express orders made before 12PM GST+1.

Do you provide free shipping?

Yes - orders over 650€ excluding taxes have free shipping.

Customers that qualify for free shipping can still select rapid shipping options.

When will I receive my order?

Average order times can be estimated below.

Average shipping estimates can be seen by selecting the destination country / region below.

While actual shipping times may vary - these estimations are built off our real delivery statistics. To receive an order as quickly as possible, we recommend:

  • Use the Urgent Express shipping method
  • Use same day shipment by placing the order before 12PM GMT+1

Do you ship internationally?

We ship world-wide, but due to logistical or legal restrictions, we are unable to ship to the following countries: Martinique, St. Martin, Guadeloupe, Mayotte, Réunion, St. Barthélemy, St. Pierre & Miquelon, Moldova, Argentina, Belarus, Bolivia, Brazil, Cambodia, Chile, Ecuador, Georgia, India, Iraq, Kazakhstan, Kuwait, Liberia, Libya, Nepal, Oman, Panama, Peru, Russia, South Africa (Exception: Gauteng), Turkey, Ukraine, Vietnam, Egypt, Pakistan, Serbia, Spain (Balears, Ceuta,Las Palmas, Santa Cruz de Tenerif), Faroe Islands, Gibraltar, French Guiana, French Polynesia, French Southern Territories, Saudi Arabia.

Where do you ship from?

All items are dispatched from France. You will receive a tracking number upon item dispatch. The address used on your purchase is printed as a label - please double check your address to avoid mistakes.

When will my order be dispatched?

Lab401 dispatches orders Monday - Friday.
All orders placed before 12PM GMT+1 will be dispatched the same day. All orders placed after this cutoff time will be dispatched the next business day.

For example:

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  • An order placed on Friday, 6PM GMT+1 will be dispatched Monday.
  • An order placed on Saturday will be dispatched Monday

For any questions, please contact customer support.

How are import duties / customs handled?

For all European Union destinations, all shipments are DDP - Delivered Duty Paid. This means all applicable VAT/TVA, shipping costs and customs fees are pre-paid.
You will not be charged by the courier service / post office or customs.

For all destinations outside European Union, all shipments are DDU - Delivered Duty Unpaid. This means that your country's custom service impose a VAT/TVA/Import Duty on your shipment.

I am charged VAT ?

Lab401 (ETOILE 401 SAS) is an EU-Registered entity. VAT is applicable to purchases delivered within the EU, with exceptions for VAT Registered entities. VAT is calculated at checkout. For your convenience, you can browse Lab401 with prices Including VAT and Excluding VAT.

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Delivery Protection

Is my delivery protected?

All Lab401 shipments are insured with the carrier.

We also provide an advanced insurance, Lab401 Delivery Protection.

Lab401 Delivery Protection means we remain fully responsible for the package right up to delivery. If the package is lost or damaged, the package can be resent immediately (48 business hours) upon receipt of proof.

For orders without Delivery Protection, lost or damaged packages will pass through the carrier's protocols, which can take well over 30 days.

For orders that are time-sensitive, we recommend Lab401 Delivery Protection.

Delivery Protection can be purchased at checkout easily and cheaply.