NanoPi Duo

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1 Introduction

概览

正面

背面

• The NanoPi Duo is designed and developed by FriendlyElec for makers, hobbyists and professionals. It is as small as 52 x 27 mm. It uses Allwinner’s Cortex-A7 H2+ SoC. It has 256M/512M DDR3 RAM and an onboard WiFi module. A UbuntuCore image is ready for it.
• On such a small board rich interfaces such as Ethernet, USB, SPI, UART, I2C, PWM, IR and audio are exposed. It is powered from a MicroUSB port and boots OS from a MicroSD card.
• Popular libraries and utilities: WiringPi, RPi.GPIO and Python are ported to the NanoPi Duo’s system and they all are open source. The NanoPi Duo perfectly suits various light-weight IoT applications.

2 Hardware Spec

• CPU: Allwinner H2+, Quad-core Cortex-A7
• DDR3 RAM: 256MB/512MB
• Connectivity: 10/100M Ethernet
• Wifi：XR819
• USB Host: 2.54mm pin x2, exposed in 2.54mm pitch pin header
• MicroSD Slot x 1
• MicroUSB: OTG and power input
• Debug Serial Interface: exposed in 2.54mm pitch pin header
• Audio input/output Interface: exposed in 2.54mm pitch pin header
• GPIO: 2.54mm spacing 12pin x2. It includes UART, SPI, I2C, IO etc
• PCB Dimension: 25.4 x 50mm
• Power Supply: DC 5V/2A
• Temperature measuring range: -40℃ to 80℃
• OS/Software: U-boot，Linux Kernel 4.11.2 (mainline) , Ubuntu 16.04.2 LTS (Xenial)
• Weight: xxg(With Pin-headers)

3 Diagram, Layout and Dimension

3.1 Layout

NanoPi Duo Layout

pinout

• GPIO Pin Description

Pin silk screen	Name	Linux gpio		Pin silk screen	Name	Linux gpio
MICN	MIC_N			SPD	EPHY-LED-SPD
MICP	MIC_P			LNK	EPHY-LED-LINK
LOR	LINEOUT_R			TD+	EPHY-TXP
LOL	LINEOUT_L			TD-	EPHY-TXN
CVB	CVBS			RD+	EPHY-RXP
TX1	UART1_TX/GPIOG6	198		RD-	EPHY-RXN
RX1	UART1_RX/GPIOG7	199		DP2	USB-DP2
MO	UART3_RTS/SPI1_MOSI/GPIOA15	15		DM2	USB-DM2
MI	UART3_CTS/SPI1_MISO/GPIOA16	16		DP3	USB-DP3
CLK	UART3_RX/SPI1_CLK/GPIOA14	14		DM3	USB-DM3
CS	UART3_TX/SPI1_CS/GPIOA13	13		IOG11	GPIOG11	203
SDA	I2C0_SDA/GPIOA12	12		IRRX	GPIOL11/IR-RX	363
SCL	I2C0_SCL/GPIOA11	11		GND	GND
GND	GND			3V3	SYS_3.3V
DTX	DEBUG_TX(UART_TXD0)/GPIOA4	4		5Vin	VDD_5V
DRX	DEBUG_RX(UART_RXD0)/GPIOA5/PWM0	5		5Vin	VDD_5V

Note:

1. SYS_3.3V: 3.3V power output
2. VDD_5V: 5V power input/output. When the external device’s voltage is greater than the MicroUSB's voltage the external device is charging the board otherwise the board powers the external device. The input range is 4.7V ~ 5.6V
3. All pins are 3.3V, output current is 5mA
4. For more details refer to the document NanoPi Duo Schematic

3.2 Dimensional Diagram

For more details refer to the document NanoPi_Duo_v1.0_1706 pcb file in dxf format

4 Get Started

4.1 Essentials You Need

Before starting to use your NanoPi Duo get the following items ready

• NanoPi Duo
• microSD Card/TFCard: Class 10 or Above, minimum 8GB SDHC
• microUSB power. A 5V/2A power is a must
• A Host computer running Ubuntu 14.04 64 bit system
• a serial communication board

4.2 TF Cards We Tested

To make your NanoPi Duo boot and run fast we highly recommend you use a Class10 8GB SDHC TF card or a better one. The following cards are what we used in all our test cases presented here:

• SanDisk TF 8G Class10 Micro/SD TF card:

• SanDisk TF128G MicroSDXC TF 128G Class10 48MB/S:

• 川宇 8G C10 High Speed class10 micro SD card:

4.3 Make an Installation TF Card

4.3.1 Download Image Files

Get the following files from here download link to download image files (under the official-ROMs directory) and the flashing utility(under the tools directory):

Image Files:
nanopi-duo_ubuntu-core-xenial_4.x.y_YYYYMMDD.img.zip	Ubuntu-Core with Qt-Embedded Image File, kernel:Linux-4.x.y
Flash Utility:
win32diskimager.rar	Windows utility. Under Linux users can use "dd"

4.3.2 Make Installation MicroSD Card with Ubuntu-Core with Qt-Embedded Image

Extract an OS image and win32diskimager.rar. Insert a MicroSD card(at least 8G) into a Windows PC and run the win32diskimager utility as administrator. On the utility's main window select your TF card's drive, the wanted image file and click on "write" to start flashing the SD card till it is done.Insert this card into your Duo's MicroSD card slot and power on (with a 5V/2A power source). If the blue LED is blinking this indicates your Duo has successfully booted.

5 Work with Ubuntu-Core with Qt-Embedded

5.1 Run Ubuntu-Core with Qt-Embedded

• If you want to do kernel development you need to use a serial communication board, ie a PSU-ONECOM board, which will allow you to operate the board via a serial terminal

• The NanoPi Duo can work with FriendlyElec's Mini Shield for NanoPi Duo.Here is link to the wiki site of Mini Shield for NanoPi Duo Mini Shield for NanoPi Duo. Here is a hardware setup.
  

Mini Shield for NanoPi Duo-Duo

• Ubuntu-Core User Accounts:

Non-root User:

   User Name: pi
   Password: pi

Root:

   User Name: root
   Password: fa

The system is automatically logged in as "pi". You can do "sudo npi-config" to disable auto login.

• Update packages:

$ sudo apt-get update

5.2 Extend TF Card's rootfs Section

When you boot OS for the first time with your image card your OS will automatically resize the file system and this process takes a relatively long time.After your OS is fully loaded you can check the file system's size by using the following command:

$ df -h

5.3 Work with npi-config Utility

The npi-config is a system configuration utility for setting passwords, language, timezone, hostname, SSH and auto-login,and enabling/disabling i2c, spi, serial and PWM and I2S. You can start this utillity by running the following command:

$ sudo npi-config

Here is the npi-config's main window:

5.4 Ethernet Connection

The Mini Shield for NanoPi Duo has an Ethernet port. If a NanoPi Duo is assembled with a Mini Shield and is connected to a network via Ethernet before it is powered on it will automatically obtain an IP after it is powered up. If it is not connected via Ethernet or its DHCP is not activated obtaining an IP will fail and system will hang on for about 15 to 60 seconds. In this case you can try obtaining an IP by using the following command:

$ dhclient eth0

5.5 Wireless Connection

Enable the WiFi function on Duo by running the following commands. The NanoPi Duo has an onboard Wifi antenna. It will be better to connect an external antenna to Duo.

• List network devices

$ sudo nmcli dev

Note: if a network device's status is "unmanaged" it means that device is not accessed by the NetworkManager and you need to clear the settings in " /etc/network/interfaces" and reboot your board.

• Start WiFi

$ sudo nmcli r wifi on

• Scan Nearby WiFi Hotspots

$ sudo nmcli dev wifi

• Connect to a WiFi Hotspot

$ sudo nmcli dev wifi connect "SSID" password "PASSWORD"

The "SSID" and "Password" need to be replaced with your actual SSID and password.
If a connection is successfully established your board will be automatically connected to your specified WiFi on system reboot.

For more details about the NetworkManager refer to this wiki link:Use NetworkManager to configure network settings

The NanoPi Duo supports external USB WiFi modules. Here is a list of models we tested:

Index	Model
1	RTL8188CUS/8188EU 802.11n WLAN Adapter
2	RT2070 Wireless Adapter
3	RT2870/RT3070 Wireless Adapter
4	RTL8192CU Wireless Adapter
5	MI WiFi mt7601

5.6 Login via SSH

You can log into the board via SSH. In our test the IP address detected by our router was 192.168.1.230 and we ran the following command to log into the NanoPi Duo:

$ ssh root@192.168.1.230

The password is fa

5.7 Connect NanoPi Duo to USB Camera(FA-CAM202)

The NanoPi Duo works with FA-CAM202. After a NanoPi Duo is assembled with a Mini Shield for NanoPi Duo you can connect a FA-CAM202 to the Shield's USB port.

The FA-CAM202 is a 2M-pixel USB camera module.For more details refer to this wiki site:Matrix - USB_Camera(FA-CAM202).
Boot your Duo, connect Duo to the internet, log in the system as root, compile and run the mjpg-streamer utility:

$ su root
$ cd /root/mjpg-streamer
$ make
$ ./start.sh

The mjpg-streamer is an open source media server. After it is started successfully you will see the following messages:

 
 i: Using V4L2 device.: /dev/video0
 i: Desired Resolution: 1280 x 720
 i: Frames Per Second.: 30
 i: Format............: YUV
 i: JPEG Quality......: 90
 o: www-folder-path...: ./www/
 o: HTTP TCP port.....: 8080
 o: username:password.: disabled
 o: commands..........: enabled

In our case our Duo's IP address was 192.168.1.169. We typed "192.168.1.169:8080" on a browser, entered and we got the following screenshot:

5.8 Check CPU's Working Temperature

Type the following command on a terminal to read the SoC's temperature and frequency:

$ cpu_freq

5.9 Check System Information with Rpi-Monitor

Our Ubuntu-Core contains the Rpi-Monitor utility with which users can check system information and status.
In our case our Duo's IP was 192.168.1.230 and we typed the following IP in a browser:

192.168.1.230:8888

We entered the following page:

You can easily check these system information and status.

5.10 Access GPIO Pins/Wirings with WiringNP

The wiringPi library was initially developed by Gordon Henderson in C. It contains libraries to access GPIO, I2C, SPI, UART, PWM and etc. The wiringPi library contains various libraries, header files and a commandline utility:gpio. The gpio utility can be used to read and write GPIO pins.
FriendlyElec integrated this utility in Duo's system allowing users to easily access GPIO pins. For more details refer to WiringNP WiringNP

6 Make Your Own Ubuntu-Core with Qt-Embedded

6.1 Use Mainline BSP

The NanoPi Duo has gotten support for kernel Linux-4.x.y with Ubuntu Core 16.04. For more details about how to use mainline u-boot and Linux-4.x.y refer to :Mainline U-boot & Linux

9 Resources

9.1 Schematics & Datasheets

• Schematics: NanoPi Duo V1.0 1706 schematic
• Dimensional Diagram: NanoPi Duo V1.0 1706 PCB Dimensional Diagram
• Datasheet:

10 Update Log

10.1 July-17-2017

• Released English Version

10.2 August-12-2017

• Updated section 1