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LilyPad Simblee BLE Board - RFD77101
project on project

iNFormµ Wearable Stage One
by Lang Mei

Description: The LilyPad Simblee BLE Board is a wearable development board that allows you to add mobile application functionality via Bluetooth Low Energy (BLE, or Bluetooth 4.0) to your e-textile projects. Unlike other BLE solutions, the Simblee requires no specialized app development skills to realize the phone-side interface: all the necessary coding is done in the Arduino IDE and then uploaded to a browser app on the phone. With this board you will be able to create plenty of interesting wearable IoT projects!

The Simblee RFD77101 module, equipped to this board, is intended to make embedded devices using Bluetooth Low Energy connections easier for everyone: hardware hackers, app developers, students, makers, engineers, and anyone else who wants to leverage their smartphone via BLE. For more information on using the Simblee to create your own applications for embedded project, visit our Simblee Concepts tutorial found in the Documents section below.

This board also comes complete with a LiPo battery connector to roam wherever you need and a FTDI header to connect our LilyPad FTDI Basic or the 5V FTDI Basic programming boards. Each board has also been equipped with a Charge/Power switch to control power to the board. Our LilyPad line is designed for wearable electronics including pads big enough to sew into a project with conductive thread. If you prefer to solder to your boards, the LilyPad board does leave that option open as well.

Note: Please do not use the 3.3V FTDI Basic with this board, as it may not be able to source enough current from the 3.3V rail.

Note: A portion of this sale is given back to Dr. Leah Buechley for continued development and education of e-textiles.


  • ARM Cortex M0 processor
  • Bluetooth® Smart Stack built-in
  • 128KB of Flash
  • 24KB of RAM
  • Integrated 16 MHz crystal and 32KHz precision crystal
  • Integrated Antenna
  • FTDI Programming Header
  • Charge/Power Switch


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Customer Comments

  • Can I connect this LilyPad Simblee BLE to an Arduino Nano board through I2C. Or do I need to put a converter (ex. CD4010BE ) between them?

    Arduino Nano - Operating Voltage = 5V ( )

    I am a total beginner, thanks for any advices.

  • Is it possible to interface SD card to Lilypad simblee?

    • Possible, but very difficult. You’d have to bit-bang the SPI interface, and that would use up four of the available pins AND probably make it impossible to use most of the existing libraries.

      If SD is really important to you, I’d go with the standard Simblee Breakout. It would even be compatible with the RFDuino microSD shield that we sell.

  • Hi, I want to make sure that: I still can connect to my own android app. ui() and ui_event() are not necessary. Is it right?

    • I believe that is the case, but I don’t know enough about Android app integration to be able to give you a 100% for certain answer.

  • What is the biggest LiPo battery this will charge? I put a 2000mAh battery on and it only worked an short time. Will this battery damage the board? I see the hook-up guide says it’s set to 100mA charge rate, and good for 100mAh and higher LiPo’s. Anyone using a big battery?

  • I happy with my new lilypad and does not have app for android :( It would be good to put it in the description, it only works with iphone for now

  • How many analog pins does this board have?

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Complete Simblee Implementation for Prototyping

At the time of writing this, there are a couple of Simblee variants out there: Lilypad, Breakout, and RFduino.

Only the Lilypad variant gives you a self contained board with Simblee, battery charger, and LiPo battery connector, and some basic pins for interfacing. This is the perfect package for prototyping portable BLE sensors, buttons, and other gadgets.

With an FTDI Basic, I was able to get going within a matter of minutes and build a BLE magnetic door sensor that I could deploy on the wall and forget!

I am not that interested in wearables, but time and time again, Lilypad has made the perfect miniaturized prototyping platform.

Bluetooth startup glitch

Needed to write terminal commands chmod +x /path before error 13 permission denied/ to get the bluetooth working. See thread similar problem but with digistump instead of Simblee.

Related Tutorials

Simblee LilyPad Hookup Guide

February 4, 2016

The Simblee LilyPad lets you easily integrate Bluetooth Low Energy and mobile apps into your e-textiles projects.

Simblee Concepts

February 4, 2016

The Simblee module is a powerful but easy to use Bluetooth 4.0 device which allows you to create a GUI from directly within your Arduino code!

Support Tips

Looking for the I2C pins on the LilyPad Simblee?

The I2C pins on the board are 5 (SCL) and 6 (SDA).