Arch BLE


Arch BLE is an mbed enabled development board based on Nordic nRF51822. With Arduino form factor and Grove connectors, it is extremely easy to create a Bluetooth Low Energy(BLE) device.
The nRF51822 is a powerful multi-protocol single chip solution for ULP wireless applications. It incorporates Nordic’s latest best-in-class performance radio transceiver, an ARM Cortex M0 MCU and 256kB flash + 16kB RAM memory. The nRF51822 supports Bluetooth® low energy and 2.4 GHz protocol stacks.


  • mbed enabled
    • Online IDE
    • Easy to use C/C++ SDK
    • Handy libraries
  • CMSIS DAP based on LPC11U35
    • Drag-n-drop programming
    • Debug using CMSIS DAP standard
    • USB virtual serial for communication
  • Arduino form factor with Grove connectors
  • Nordic nRF51822 Multi-protocol Bluetooth® 4.0 low energy/2.4GHz RF SoC
    • ARM Cortex M0 processor
    • 256kB flash/16kB RAM
    • Configurable I/O mapping for digital I/O
  • USB Micro B connector

Hardware Overview

Get Started

  1. Click this link to login or signup to mbed
  2. Import the mbed_blinky program
  3. Click the Compile icon of the top toolbar to compile the program, then download the compiled hex file.
  4. Drag-n-drop the downloaded hex file into the MBED disk
You can open main.cpp to change the program. For example, use the following code to blink the LED every 0.1s
#include "mbed.h" DigitalOut led(p30); // on-board led is connected to p30 int main() { while (true) { led = !led; wait(0.1); } }
If you are get a compiling error that 'device.h' is not found, try to update the mbed library to the latest revision in your program.


If you want to change the program, click this link to import the Color Pixels program to mbed online IDE.
If the BLE device is disconnecting frequently, we can improve the stability by changing the BLE parameters - Advertising Duration (in main.cpp), Min Interval and Max Interval (in nRF51822/projectconfig.h)
#define CFG_GAP_CONNECTION_MIN_INTERVAL_MS 20 /**< Minimum acceptable connection interval */ #define CFG_GAP_CONNECTION_MAX_INTERVAL_MS 200 /**< Maximum acceptable connection interval */
  • A Toy car controlled by mobile phone.

Update or Restore Firmware

The latest firmware version for the Arch BLE is v0221 built on March 02 2015. To check your firmware version and built date, open the MBED.HTM file of your MBED disk in a text editor.
Change log:
  • 2014-06-26: First version
  • 2014-08-25: Support to drag-n-drop hex file generated by gcc toolchain and without softdevice
  • 2014-10-08: Use USB EJECT INSET instead of reconnecting USB, increase intel hex data line buffer (from 64 bytes to 128 bytes)
  • 2015-02-03: Fix Mac OS X 10.10 Yosemite read only file system bug
Known issues:
  • Issues when directly downloading the hex file into the MBED disk with the Chrome browser. The reason is Chrome creates a temporary file while downloading. If you are using Chrome, please save the hex file to a different location and then copy it to the MBED disk.
To flash a new firmware:
  • Hold the Arch BLE’s button and power it ON.
  • A CRP DISABLD disk will pop up.
    • On Windows, replace firmware.bin with the above firmware.
    • On Linux/Mac, use command: dd if={new_firmware.bin} of={firmware.bin} conv=notrunc


Help us make it better

Thank you for choosing Seeed. A couple of months ago we initiated a project to improve our documentation system. What you are looking at now is the first edition of the new documentation system. Comparing to the old one, here is the progresses that we made:
  • Replaced the old documentation system with a new one that was developed from Mkdocs, a more widely used and cooler tool to develop documentation system.
  • Integrated the documentation system with our official website, now you can go to Bazaar and other section like Forum and Community more conveniently.
  • Reviewed and rewrote documents for hundreds of products for the system’s first edition, and will continue migrate documents from old wiki to the new one.
An easy-to-use instruction is as important as the product itself. We are expecting this new system will improve your experience when using Seeed’s products. However since this is the first edition, there are still many things need to improve, if you have any suggestions or findings, you are most welcome to submit the amended version as our contributor or give us suggestions in the survey below, Please don’t forget to leave your email address so that we can reply.
Happy hacking