Gadget Renesas

Linking Ideas and Electronics




GR-LYCHEE is an IoT prototyping board with camera and wireless(Wi-Fi, BLE). And GR-LYCHEE is the GR reference board for RZ family RZ/A1LU group products. Pin-compatible with Arduino UNO and ARM® mbed™ enabled development platform. You can also sketch like Arduino with Renesas Web Compiler and IDE for GR.


Equipped with ARM Cortex-A RZ/A1LU (R7S721030VCFP)
Various Arduino shields can be mounted, but 3.3V I/F.
Camera is attached as standard.Arduino shield
connector, USB host interface connector is not
mounted, parts are attached in -FULL version.
Vendor's site
On the back side are a camera interface,
an SD socket and general-purpose LCD
expansion connector is mounted.

Features of GR-LYCHEE are as follows.

  • Enable to get an image of VGA (640 x 480) with attached camera. When transferring with USB CDC, transfer rate of 60 fps can be realized.
  • OpenCV V3.2 is applied and various SDKs are provided. You can enjoy computer vision right away.
  • Equipped with ESP32. Cloud connection with Wi-Fi, smartphone communication with BLE possible.
  • Equipped with 4-pole audio jack. Audio input / output is possible.
  • SD card can be inserted. FlashAir™ is also OK.(Refer to "About FlashAir Connection")
  • mbed™ easy programming. If you copy it to storage, you can run it.
  • Optional USB A connector can be equipped. Can be used for connection of USB memory etc.

Demonstration movie running OpenCV Canny function (edge detection) with GR-LYCHEE.


Item Description
Micro processor RZ/A1LU (R7S721030VCFP 176pin QFP)
ROM/RAM External FLASH 8MB/internal 3MB
Operating Frequency 384MHz
RTC clock 32.768Hz
Operating Voltage 3.3V/1.18V
Camera Shikino High-Tech KBCR-M04VG-HPB2033
VGA 640x480, up to 60fps
Horizontal angle 98 degree, vertical angle 75 degree
Board Function Camera interface (camera module included)
ESP32 wireless module (Wi-Fi, BLE)
USB peripheral(micro B connector)
USB host (option)
4 pole audio input / output jack
SD socket
LCD connector
User button switch(2 pcs)
Reset button switch
JTAG interface
Connector for Arduino shield(option)
LED for user(4 pcs)


Boards Distributor

GR-LYCHEE boards and other shields can be purchased through the following sites:

Japanese distributors are here. (日本での購入についてはこちら)

Technical Support

Technical Information
Related Web Site


Schematic / Design


Sketch Reference (like Arduino Sketch)

LYCHEE Sketch Reference

How to program

GR-COTTON Special site

Renesas Web compiler(sketch like Arduino style on online)

Top page(log-in)

IDE for GR(sketch like Arduino style offline)

IDE for GR

Project file for e2studio

Project file for sketching in Eclipse based development environment e2studio. For downloading and installing e2studio please refer to the product page.

You can import as archive file (zip) as existing workspace from e2studio menu "File" -> "Import".

Do the menu "Project" -> "Update all dependencies" at the initial build. Only sources changed since the next build will be compiled.

Standard project(Updated Oct 24th, 2018) (Arduino style) (mbed style)

Project with OpenCV(Updated Oct 24th, 2018) (Arduino style, OpenCV included) (mbed style, OpenCV included)

OpenCV project for library generation


DisplayApp is an application that displays the camera image sent by USB CDC.

For Windows

Installing the USB driver is required on versions earlier than Windows 10.

Below is an Arduino-like sketch example.

About FlashAir Connection

You can connect FlashAir™ to the SD socket on the back of GR-LYCHEE. You can access photos saved with GR-LYCHEE's camera from your smartphone or tablet. It can also be used as a Wi-Fi interface using iSDIO. For details on how to use FlashAir, refer to the Developers site.


Products those operation has been confirmed are as follows.

FlashAir W-03(8GB, 16GB, 32GB)
FlashAir W-04(16GB, 32GB)

Note: For W-04, the iSDIO function by CMD 17/24 can be used with firmware W 4.00.01 or later. Check version of yours.

3D data for Fusion 360

3D data that can be imported with Autodesk Fusion 360. Use it when making cases for GR-LYCHEE.