BakeBit - NanoHat Hub

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1 Introduction

• The NanoHat Hub is a plug & play extension board.The NanoHat Hub communicate with the NanoPi NEO/AIR via its I2C interface. It acts as an interface between the NanoPi NEO/AIR and various external modules. The NanoHat Hub has 3 I2C interfaces,3 analog interfaces,2 UART interfaces and 4 digital interfaces (among which D3 and D5 support PWM).All the BakeBit modules can be connected to the NanoHat Hub with a 4-pin cable.
• The NanoHat Hub can be mounted on the NanoPi NEO/AIR with male connectors.The NanoHat Hub communicates with various external modules via its I2C, serial and A/D interfaces.
• The NanoHat Hub has 3 I2C interfaces,3 analog interfaces,2 UART interfaces and 4 digital interfaces (among which D3 and D5 support PWM).

BakeBit - NanoHat Hub

2 Hardware Spec

• Compatible with NanoPi NEO/AIR
• 3 x 2.0mm pitch 4Pin I2C Interface
• 3 x 2.0mm pitch 4Pin Analog Interface
• 1 x 2.0mm pitch URAT-NEO Interface
• 1 x 2.0mm pitch URAT-Hub Interface
• 4 x 2.0mm pitch Digital Interface
• PCB dimension (mm): 40 x 40
• 2.0mm pitch 4Pin Connector Pin File in PDF

• Pin Spec:
• 24 Pin Spec

Pin#	Name	Pin#	Name
1	SYS_3.3V	2	VDD_5V
3	I2C0_SDA	4	VDD_5V
5	I2C0_SCL	6	GND
7	GPIOG11	8	UART1_TX/GPIOG6
9	GND	10	UART1_RX/GPIOG7
11	UART2_TX/GPIOA0	12	PWM1/GPIOA6
13	UART2_RTS/GPIOA2	14	GND
15	UART2_CTS/GPIOA3	16	UART1_RTS/GPIOG8
17	SYS_3.3V	18	UART1_CTS/GPIOG9
19	SPI0_MOSI/GPIOC0	20	GND
21	SPI0_MISO/GPIOC1	22	UART2_RX/GPIOA1
23	SPI0_CLK/GPIOC2	24	SPI0_CS/GPIOC3

• 12 Pin Spec

Pin#	Name	Description
1	VDD_5V	5V Power In/Out
2---11	NC	Not Connected
12	GND	0V

BakeBit - NanoHat Hub Interface

• Each BakeBit interface is a 2.0mm pitch 4pin connector. Here is its specification:

• I2C Interface

There three 5V I2C interfaces on the top row. The first pin from the left is SCL and the second pin is SDA.

Pin	Name	Description
1	SCL	SCL
2	SDA	SDA
3	5V	5V supply voltage
4	GND	Ground

• Analog Interface

There are three analog interfaces on the second row. The first pin from the left is An and the second pin is An+1. For example A0/A1 stands for the first pin A0 and the second pin A1 from the left. Usually it is abbreviated as A0.

Pin	Name	Description
1	An	Analog An
2	An+1	Analog An+1
3	5V	5V supply voltage
4	GND	Ground

• UART Interface

The NanoHat Hub has two UART interfaces. When you connect the NanoHat Hub to the NanoPi NEO/AIR the first UART on the third row from the left is directly connected to the NEO/AIR's UART1. The second UART is the UART populated from NanoHat Hub's chipset and this UART can be used as D0/D1.

Pin	Name	Description
1	Rx	Receiver
2	Tx	Transmitter
3	5V	5V supply voltage
4	GND	Ground

• Digital Interface

The remaining four are digital interfaces. The fist from the left is Dn and the second is Dn+1. For example D2/D3 stands for the first pin D2 and the second pin D3 from the left. Usually it is abbreviated as D2.

Among these 5 digital interfaces D2-D6 D3, D5 and D6 can be used as PWM.

Pin	Name	Description
1	Dn	Digital Interface Dn
2	Dn+1	Digital Interface Dn+1
3	5V	5V supply voltage
4	GND	Ground

3 How To

BakeBit - Refer to this link for more details on how to connect the NanoHat Hub to the NanoPi NEO/AIR:BakeBit - How to Connect NanoHat Hub to NanoPi NEO/AIR

4 BakeBit Modules

Here is a list of BakeBit modules that can work with the NanoHat Hub:

• 1、Button
• 2、Buzzer
• 3、Green LED
• 4、Joystick
• 5、LED Bar
• 6、Light Sensor
• 7、OLED
• 8、Red LED
• 9、Rotary Angle Module
• 10、servo
• 11、Sound
• 12、Ultrasonic Ranger

5 Update NanoHat Hub's Firmware

You can update the chipset's firmware(bakebit_firmware.hex) of the NanoHat Hub by following the instructions below:
Install avrdude on NanoPi NEO/AIR's system:

apt-get install avrdude

Append the following lines in the "/etc/avrdude.conf" file:

# Linux GPIO configuration for avrdude. 
# Change the lines below to the GPIO pins connected to the AVR. 
programmer 
  id    = "nanopineo"; 
  desc  = "Use the Linux sysfs interface to bitbang GPIO lines"; 
  type  = "linuxgpio"; 
  reset = 67; 
  sck   = 66; 
  mosi  = 64; 
  miso  = 65; 
;

Enter the "Firmware" directory and run the "firmware_update.sh" script to update the firmware:

cd ~/BakeBit/Firmware 
./firmware_update.sh

After a prompt shows up select "y". If the update is done successfully you will see the following messages:

The firmware is a ".hex" binary file and you can check the latest version by running the "new_fw_search.sh" script.

6 Compile Firmware with Arduino IDE

1) Download the Arduino IDE from the following link and install it on your host PC:
https://www.arduino.cc/en/Main/Software

2) The Arduino IDE's installation directory has a "libraries" directory. Copy the whole "BakeBit/Firmware/Source/FastLED-FastLED3.1" directory to the "libraries" directory. In MacOS the libraries directory is "/Applications/Arduino.app/Contents/Java/libraries/"

3) Open the BakeBit project file in Arduino IDE:
BakeBit/Firmware/Source/bakebit_v1.0.0/bakebit_v1.0.0.ino

4) In the main Arduino GUI open the "Tools" menu and change the Board model to "Arduino Nano":

5) In the main Arduino GUI open the "Sketch" menu, select "Export Compiled Binary" to start compilation.

6) If the compilation succeeds a binary file "bakebit_v1.0.0.ino.eightanaloginputs.hex" will be generated. Rename the file to "bakebit_firmware.hex", upload it to "NanoPi NEO" and replace the file with the same name under the "BakeBit/Firmware/" directory. Follow the instructions in the previous section to run the firmware_update.sh script to flash the firmware.

7 Resources

• [Schematic](SCHEMATIC_NanoHat Hub.pdf)
• [Dimensional](Dimensional_NanoHat Hub.dxf)
• [Dimensional](2.0mm pitch 4Pin Connector Pin File in PDF)

8 Update Log

8.1 Dec-09-2016

• Released English Version

8.2 Jan-19-2017

• Renamed "NEO-Hub" to "NanoHat-Hub"

8.3 Jan-20-2017

• Renamed "NanoHat-Hub" to "NanoHat Hub"