The prototype production-ready WiFi board !

Knit is an industrial grade WiFi development board to build secure applications. It is based on the 88MW300 SoC from Marvell.

• 32-bit Cortex M4F at 200Mhz
• 512KB SRAM
• 4MB flash with XIP support
• 802.11 b/g/n with FCC, IC, CE certification
• 1 user LED & 1 user button

The multiplexed peripherals include -

• MQTT client real time communication with brokers
• Soft AP for provisioning
• Secure connections using TLS 1.2
• FreeRTOS as the underlying real time operating system
• lwIP TCP/IP stack
• Supported on Windows, Linux, OS X operating systems
• More features coming soon !

Links to -

• Source code
• Documentation
  • API
  • Wiki
• Support
  • Chat
  • Issues

• On board USB to serial converter for programming and console
• Open source GCC ARM toolchain for development
• OpenOCD debugging using external dongle
• Support for Eclipse IDE

All of these can be found on the bottom side of the module, which is visible on the Knit board.

• Hackaday

Get the SDK on your development machine

using git

git clone https://github.com/marvell-iot/aws_starter_sdk

or https

wget https://github.com/marvell-iot/aws_starter_sdk.git

Download the latest blob from the releases section.

[WIP]

Install the required tools as per instructions found here

Next up, download the SDK on your development machine.

From the root directory of the SDK, run

make APP=sample_apps/aws_starter_demo BOARD_FILE=sdk/src/boards/knit-v1.c

[WIP]

• Knit has 2 16 pin headers, which are breadboard friendly.It also has a 4 pin header for easy SWD programming.
• The header file where all the pin functions are defined is mw300_pinmux.h

• Color coded pinmaps
  Header 1 > Header 2 >

The Knit board has both 5V and 3.3V power rails. Both, 5V and 3.3V, are made available on the dual pin headers, but please note that the controller pins are all 3.3V logic. Supplying any of the pins more than 3.3V will likely result in a bricked board.

The 5V is used by

• LM1117 linear regulator IC
• CP2102 USB to serial converter

The 3.3V is used by

• AW-CU300 WiFi module
• W25Q32 Winbond Flash

The above setup allows one to power the board using an external 5V when developing an application, and switch to a 3.3V source, like a lithium ion battery, when deploying the application. The voltage regulator and the USB to serial converter is not necessary for normal operation of the WiFi module and flash memory, as long as you have a stable 3.3V power source.

If you want to save some more power, you can get rid of the power LED resistor. That'll knock off a few mA. Of course, the nice red LED won't show your powered on status once you do this. Please note that removing a resistor has the risk of damaging nearby tracks/connections if you are not careful. Please avoid doing this if you are not sure.

You can power up your Knit board using one of the following -

• 5V through USB
• 5V through pins
• 3.3V through pins (advanced)

Coming soon...

Knit is open source hardware. There are a few definitions of OSHW, but what it means to us is that everything that one would need to make Knit is made available to everyone under a permissive license.

Knit is licensed under the MIT License. You can find text of the license here. All the files can be found on our GitHub.

The Knit board consists of the following major hardware components -

We have the following buttons and LEDs onboard the Knit -

We have the following pin headers onboard the Knit -

The Azurewave module that is being used is certified as follows -

• FCC ID TLZ-CU300
• CE
• IC ID 6100A-CU300
• NCC ID CCAI15LP1350T2

The Azurewave module, and hence the Knit board, has a PCB antenna as the internal antenna, and it also has a uFl connector if you would like to get better range with an external antenna.

In this screen capture, checkout how to create a new IoT thing by signing in to your AWS account.

  <iframe width="470" height="315" src="https://www.youtube.com/embed/hOc-iZcmv9E?list=PLIYfgNqDE8r2XNkXMqbaiF0iBbli7cNYz" frameborder="1" allowfullscreen></iframe>

In this video see how to connect to AWS using the keys that we generated in the previous video and then send a push button event to the AWS IoT device shadow.

  <iframe width="470" height="315" src="https://www.youtube.com/embed/CFwY_jNb59s?list=PLIYfgNqDE8r2XNkXMqbaiF0iBbli7cNYz" frameborder="1" allowfullscreen></iframe>

The Knit is based on the Marvell 88MW300 WiFi microcontroller. This is an industrial grade SoC which is being used to make all sorts of consumer applications, even battery operated ones.

Some of the commercially available products that have been made using the 88MW300 WiFi microcontroller-

The Knit is capable of running the following frameworks. Please note that one needs to contact Marvell/respective framework provider to get access to the source code and documentation.

• Google Weave
  • 88MW300 is the first MCU platform to support Google Weave.
• Apple's HomeKit.
  • HomeKit SDK

• Is Knit OSHW (Open Source Hardware) ?
  • Yes, we have released the schematic and PCB files under the MIT license. You can find the files here.
• When will it be available ?
  • Knit is available now . Buy Now >
• What will be the price?
  • For early access developers the price will be 999₹ / $14.99
• Where can I get more support ?
  • For SDK related issues, you can join the Gitter chat or raise an issue

• PCB design by Rohit Gupta
• Logo by Cassie McKown under CC by 3.0 US

• ARM GCC toolchain
• OpenOCD
• KiCad EDA
• Eclipse C/C++ IDE
• Flatdoc site generator by Rico Sta. Cruz

• [email protected]
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