Success flash icon

Error flash icon

This campaign is no longer active and has not been relisted.


Single-unit price: $99.00 + shipping

Not available / campaign end date: Mon, 13 Apr 2020 16:19:00 PDT

Backers icon

Backers: 229

Target icon campaign show

Target: 200

Funded icon show

Funded: 364

Product Details



Brand / Manufacturer


Manufacturer Part #


Product Description

Media Coverage

What is it?

The OrangeCrab is an electronics development board. It is FPGA based featuring an ECP5 from Lattice. The board follows the slim feather board specification from Adafruit. The FPGA is compatible with all open source toolchains and is perfect for experimenting with RISC-V cores. There aren't many FPGA boards available that make use of the ECP5, but here are some distinct features that set this board apart:

  • Small Compact size (Take it anywhere!)
  • Direct USB connection to the FPGA (Operate as a DFU, MSC, CDC, or composite device!)
  • On-board DDR3 Memory (1Gbit!)
  • Pre-loaded DFU bootloader (No external programmer required!)
  • It's Orange!

What is a FPGA anyway?

FPGA is an acronym for Field Programmable Gate Array. At a basic level, a FPGA is an integrated circuit filled with an array of very basic digital building blocks.

One of these blocks is the Look-Up Table (LUT). A LUT takes some inputs and 'looks up' what its output should be. LUTs are programmable, so they can be configured to emulate basic logic elements: AND, OR, NOR, XOR. Or they can be programmed as compound logic.

Another element inside FPGAs is Flip-Flops or registers. These enable the chip to have a memory or current state. They update and hold their output value based on the input value at the rising edge of a clock signal.

The last major component inside a FPGA is the routing. Routing enables us, the digital designer, to tell the FPGA how all these internal elements shall be connected.

Using these blocks, we can create simple designs such as counters, and state machines or more complex designs like an entire CPU.

FPGAs are typically used in systems requiring lots of parallel processing, such as Video/Imaging processing, Digital signal processing, Telecom/communication encoding. They also work great for prototyping and learning digital electronics. They enable you to design and run custom digital logic. The FPGA used on this board is the ECP5 from Lattice, is classed as a low power/midrange FPGA. It's powerful enough to create a RISC-V 32bit CPU inside running at ~75MHz with a DDR3 memory controller. A CPU in isolation is typically not very useful, which is where SoC's come in.

What is a SoC?

System On Chip (SoC), in an FPGA context, describes a CPU and its connection to memory, cache, peripherals, and I/O. An FPGA is a perfect tool to experiment with your own SoCs.

Have you ever been working through a project, but then need just one more UART?

Run out of Timers?

Short on PWM?

No more program space?

Routed UART TX/RX backward on a circuit board?

A custom SoC design may have been able to help! Because you're in control of everything, you get to decide how many UARTs or PWMs you have!

If you want 20 UARTs, one on every I/O pin, this FPGA can deliver.

I've been enjoying using LiteX for working on custom SoC. It handles a lot of the basic tasks required, such as:

  • Headers: defining registers and function stubs for your custom memory-mapped peripherals
  • Firmware: compiling and embedding inside FPGA memory
  • Documentation: memory maps and bit-field descriptions of registers.

Litex also works seamlessly with LiteDRAM, which is an open source DDR memory controller. This is used and tested on the OrangeCrab to handle the management of the on-board DDR3 memory.

Hardware Overview

  • Lattice ECP5-25F FPGA in csfBGA285 package (-8 speed grade) (Part # LFE5U-25F-8MG285C)
    • 24 K - Look Up Tables
    • 1008 Kb - Embedded Block RAM
    • 194 Kb - Distributed RAM
    • 28 - 18x18 Multipliers
    • PLLs: 2
    • Internal oscillator
    • Flexible I/O for DDR3 Memory Support
  • DDR3L Memory
    • 128 Mbytes (1Gbit)
    • 64M x16
    • 1.35V low voltage operation
  • Micro USB connection
    • Full-speed (12Mbit) USB with a direct connection to the FPGA
  • Non-volatile Storage
    • 128Mbit QSPI FLASH Memory
      • Bootloader (First 4Mbits)
      • User Bitstream
      • User storage (Firmware/MSC backend/etc)
      • QSPI compatible
    • MicroSD socket
      • 4bit SD interface (CK, CMD, DAT0-3)
  • Power supply
    • High efficiency DCDC for main supplies
    • Battery charger (100mA), with a charge indicator LED
    • LiPo battery connector (PH type)
  • 48MHz onboard oscillator
  • Standard 0.05" JTAG connector
  • User I/O
    • 1x Button
    • 1x RGB LED
    • 20x I/O on 0.1" headers
  • Analog System
    • Analog Mux
    • SAR ADC, external RC / input comparator of FPGA
    • Digital bypass
    • Internal channels for supply monitor
    • Battery voltage sensing
  • Feather Format Board
    • Dimensions: 22.86mm x 50.8mm (0.9" x 2.0").

Compact Size

Unlike traditional FPGA development boards, this board is small enough to carry in your pocket and function as a prototyping ground for custom SoC designs. Create custom SoCs or work on your own custom digital logic designs on a bus, train, or in an airplane.

If you are not familiar with the feather format, you might be surprised by the size of this board. The Feather format has dimensions of: 22.86 x 50.8mm (0.9" x 2.0")

For reference this is the board pictured next to some standard ISO/IEC 7810 ID-1 cards.


Board Photos

This what you will receive, the OrangeCrab r0.2

MicroSD card not included, just shown for demonstration purposes

Example Projects

OrangeCrab-examples - still a work in progress

DFU Bootloader - The DFU bootloader that ships with the OrangeCrab.

Linux on OrangeCrab - An example of running Linux-On-Litex on OrangeCrab


The board comes pre-loaded with a USB based DFU bootloader. Just hold down the button while plugging it in to activate. The bootloader lets you load new bitstreams (FPGA code) or firmware (RISCV code) directly into the FLASH, without the need for an external programmer.

The bootloader is also open source, based on foboot (fomu bootloader)

For more advanced users, the board also features a standard 0.05" JTAG connector. The ECP5 can be reprogrammed directly over JTAG or using a SPI bypass mode, and the onboard FLASH can be read/written over JTAG.

Use your OrangeCrab in different ways

MicroPython + CircuitPython

This is still a work in progress!

Plug the board in and start blinking LEDs straight away with no external tools required.

RISCV firmware

Install the RISCV GCC compiler and start programming the board, code is executed on the SoC created by the bootloader.

FPGA gatware

Update the FPGA gateware using Verilog or other Higher level language: nMigen, Litex, Chisel, etc.

Fully Open Source

  • The OrangeCrab has been created in KiCad, an open source EDA suite.
  • OrangeCrab is a certified open source project: AU000006
  • All design files are available on the OrangeCrab Github repository
  • An open source bootloader
    • Which uses an an open source VexRiscv CPU
      • Which in turn implements the open source ISA: RISCV (rv32im)
  • Fully compatible with the open source FPGA toolchain and flow:

The open source toolchain is quick to install and fully cross platform. These tools can be installed by following the installation guides on each project, or alternatively there are prebuilt versions

The Board is also fully compatible with Lattice's Diamond IDE.


More info/Contact

Find more info on the projects Github pages site:

Contact me on twitter: @GregDavill.

I'd love to see what you create with the OrangeCrab!

Thanks for your interest, have a great day.


Why GroupGets?

The group buy will enable us to get these boards professionally manufactured by a US assembly house. We want to get more awesome hardware into your hands!

External Links

Manufacturer product page

Purchase Information

Unit Deliverable

One OrangeCrab PCB assembly

Unit Price


Campaign Part #



Not available / campaign funded, end date: Mon, 13 Apr 2020 16:19:00 PDT

Factory Lead Time

72 Days

Options and Add-Ons

USB cable


Select this option if you need a USB cable.

Orange Crab Case


A high quality custom case to keep your Orange Crab in.

  • Odtmo2xo normal

    I have just created the GroupGet for OrangeCrab!

  • Avatar

    Sorry Erich, we only ship with service levels that have tracking and they are more expensive. When we didn't use tracking, we experienced lots of "lost" package claims that were fraudulent.

  • Avatar

    Some people self-organize freight-forwarding so if you know of other people in your area that want OrangeCrab then you could coordinate an order with them.

  • Avatar

    Since the GroupGets website does not mention Customs anywhere I assume I'd have to manage import duties on my own? Is that correct?

  • 9zi7mnmg normal

    That is correct. Customs or the shipping company will contact them via phone or email if import duties are due

  • 838303?v=4

    Hello one question please, Campaign just ended When will we be charged?

  • Avatar

    Billing will happen this AM, Pacific time (Tuesday)

  • Avatar

    Quick update. We've got the PCBs in-house and will have all parts by Weds. With any luck, assembly should start by the end of the coming week.

  • Avatar

    Even though we ordered enough Lattice parts well before the campaign closed, they currently won't arrive until the end of May, which was unexpected. All PCBs and remaining parts are in hand but it's looking like we won't be able to ship until the middle of June. We will update you if this changes, and sorry for the late notice. We just found out this week that the Lattice parts got delayed.

  • 6131832?v=4

    Are there any further updates? Will the boards still be shipping in mid-June?

  • Avatar

    Given it is now mid June, can we get an update ?

  • Aoh14gii6pkugj5r0vjerukl hlnhdwolspdmgdt mxkaq=s50
    Suryoday Basak

    Hi! I will be moving out of my current address by the end of July. I live in Texas. Do you think that I should update my shipping address to the address I will be moving into? Please let me know at the earliest.

  • Avatar

    Sorry for the lack in comms. We've been busy with the automated test platform. The units are in production now and we will hopefully start shipping at the end of the month. We will let everyone know here when we start shipping or if the schedule shifts due to any production issues.

  • 18389692?v=4

    I also need to change the shipping address but not sure how to do that

  • Aoh14gii6pkugj5r0vjerukl hlnhdwolspdmgdt mxkaq=s50
    Suryoday Basak

    Hi. I would like to update my address. Please tell me how I could do that.

Featured Campaigns