Link Labs DocumentationLL-RLP-20 and LL-RXR-27 Modules Evaluation BoardConnecting the evaluation board to Arduino Due

Connecting the evaluation board to Arduino Due

This article is for the Arduino lovers in the crowd. It describes hardware configuration to control an LL-RLP-20 or LL-RXR-27 evaluation board using an Arduino DUE.

Once you get the hardware setup, please refer to this article to start your software development.

Why use Arduino Due?

The LL-RLP-20 or LL-RXR-27 module is designed to be controlled over UART. This means the Arduino must dedicate a serial interface to control the Symphony Link module.

Unfortunately, the most common Arduino boards (like the UNO) have only one serial interface (digital pins 0 and 1). This interface is used by the Arduino to communicate with a PC and it is the interface typically used to write firmware to the Arduino from the Arduino IDE. This makes it difficult to control a Symphony Link module without substantial modifications to the Arduino platform.

The Arduino Due, on the other hand, possesses several serial interfaces, and therefore it can easily be used to control a Symphony Link module without the need to modify Arduino's default use of pins 0 and 1 for programming, monitoring, etc.

Setting up the Due

You might need to install drivers for the Due.  Arduino has tons of great documentation to get started with the Due and the Arduino IDE.

Wiring diagrams

There are slight differences in connecting the various versions of the LL-RLP-20 or LL-RXR-27 evaluation board to the Arduino Due. The following pictures show wire diagrams to highlight the critical connections.

Connecting a Rev. 4 evaluation board

Don't forget to remove the USB-UART jumper, which is normally installed on the Rev. 4 board.  Otherwise, you will power the eval board's USB-UART bridge. This causes contention on the serial port used to control the module.

Connecting a Rev. 5 evaluation board (LL3B50)

Connecting a Rev. 6 evaluation board (LL3B60)

With the Rev. 6 eval board, we've tried to make it easier to connect the board to various platforms.  You'll need to make sure the 0-ohm resistors circled in purple are installed. Sorry to make you do some soldering!

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