NanoPi Duo2 IoT-Box

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1 Introduction

NanoPi Duo2 IoT-Box Side

NanoPi Duo2 IoT-Box Front

NanoPi Duo2 IoT-Box Back

• The NanoPi Duo2 IoT-Box is a dedicated carrier board for the NanoPi Duo2. It populates Ethernet port, serial port, audio and USB etc.
• It has an onboard quad-band GSM/GPRS module SIM800C.
• It has 2.0mm I2C interface, UART interface, audio interface and CVBS interface etc and can work with various external modules.
• Its MicroUSB port is only used as power input. And a power switch is added too.
• It has one power LED and one GPIO accessed LED.
• It populates the two USB ports of the NanoPi Duo2.
• It populates the serial ports and Ethernet port of the NanoPi Duo2.
• It has an IPX to SMA antenna converter for WiFi antennas.

2 Hardware Spec

• Onboard quad-band GSM/GPRS module
• 2 x USB Host
• Serial port and Ethernet port
• Audio input and output
• MicroUSB power input and a power switch
• IPX to SMA WiFi converter
• PCB dimension (mm): 85x56

2.1 Layout

NanoPi Duo2 IoT-Box Layout

Here is the NanoPi Duo2 IoT-Box's layout. Its pins' remarks are printed on the board.

• NanoPi Duo header Pin Spec

Number#	Name		Number#	Name
1	VDD_5V		17	DEBUG_RX(UART_RXD0)/GPIOA5/PWM0
2	VDD_5V		18	DEBUG_TX(UART_TXD0)/GPIOA4
3	SYS_3.3V		19	GND
4	GND		20	I2C0_SCL/GPIOA11
5	GPIOL11/IR-RX		21	I2C0_SDA/GPIOA12
6	GPIOG11		22	UART3_TX/SPI1_CS/GPIOA13
7	USB-DM3		23	UART3_RX/SPI1_CLK/GPIOA14
8	USB-DP3		24	UART3_CTS/SPI1_MISO/GPIOA16
9	USB-DM2		25	UART3_RTS/SPI1_MOSI/GPIOA15
10	USB-DP2		26	UART1_RX/GPIOG7
11	EPHY-RXN		27	UART1_TX/GPIOG6
12	EPHY-RXP		28	CVBS
13	EPHY-TXN		29	LINEOUT_L
14	EPHY-TXP		30	LINEOUT_R
15	EPHY-LED-LINK		31	MIC_P
16	EPHY-LED-SPD		32	MIC_N

3 Hardware Setup

The NanoPi Duo2 can be mounted on the NanoPi Duo2 IoT-Box carrier board. You can refer to the following setup to assemble them:

You can connect your NanoPi Duo2 IoT-Box board to a network and external modules such as USB devices

When you use the onboard quad-band GSM/GPRS module you should use an appropriate antenna and this antenna's band is different from an WiFi antenna's band. You can refer to the following setup:

4 Applications

4.1 Work with GSM/GPRS Module

To test SIM800C you need to insert a SIM card and install a GSM/GPRS antenna.
By default the FriendlyCore system FriendlyElec provides has a Python demo for testing SIM800C. Run the following commands to test it:

$ cd /root/Python/GSM-GPRS/sim800-test
$ apt-get install python-pip
$ pip install --upgrade pip
$ pip install pyserial
$ ./sim800c-test.py -h              # Check help information
./sim800c-test.py -p <phone_number> -o <operator, cmcc> -w <website>
$ ./sim800c-test.py -p 136xxxxxxxx  -o cmcc -w www.baidu.com  # Visit baidu.com

Option	Comment
-p	specifies a telephone number for sim card.
-o	specifies a telecom operator. For example "cmcc" stands for China Mobile Communication Corporation.
-w	specifies a website to visit

By default this demo will load 1K bytes' data from the specified website and it takes a while. If it is successful you will see the following information:

4.2 Work with USB Host

You can connect a USB device e.g. Matrix - LCD2USB to the NanoPi Duo2 IoT-Box board as follows:
连接Matrix - LCD2USB

4.3 Work with Audio Input & Output

1. Run the following command to record voices:

arecord -D hw:0,0 -f cd test.wav

Here is what you expect to observe:

2. Run the following command to play audio e.g. the /root/Music/test.wav file

 aplay /root/Music/test.wav

Here is what you expect to observe:


You can use the alsamixer utility to adjust the volume.

5 Resources

• [Schematic](Schematic_NanoPi Duo2 IoT-Box.pdf)
• [Dimension](Dimension_NanoPi Duo2 IoT-Box（dxf）)
• [Manual](SIM800_Series_AT_Command_Manual_V1.10.pdf)

6 Update Log

6.1 Oct-10-2018

• Released English Version