BakeBit - NanoHat Hub

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1 Introduction

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

BakeBit - NEO 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

• 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 - NEO 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 NEO-Hub has two UART interfaces. When you connect the NEO-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 NEO-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 NEO Hub to the NanoPi NEO/AIR:BakeBit - How to Connect NEO Hub to NanoPi NEO/AIR

4 BakeBit Modules

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

• 1、按键模块
• 2、蜂鸣器模块
• 3、绿色LED模块
• 4、摇杆模块
• 5、LED Bar模块
• 6、光敏模块
• 7、OLED模块
• 8、红色LED模块
• 9、旋转角度模块
• 10、舵机模块
• 11、声音模块
• 12、超声波模块

5 升级NEO Hub固件

升级BakeBit固件的实质是，将新版本的固件文件（名为bakebit_firmware.hex）烧写到NEO-Hub的芯片内，下面的内容是具体的步骤:
先在NanoPi NEO上安装 avrdude:

apt-get install avrdude

再用vi编辑配置文件 /etc/avrdude.conf，在文件最末尾加入如下内容:

# 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; 
;

然后进入Firmware目录，执行firmware_update.sh脚本上传固件:

cd ~/BakeBit/Firmware 
./firmware_update.sh

根据脚本的提示选择y, 固件更新成功的提示如下所示：

正如你所见，固件是一个名为.hex的二进制文件，你可以使用脚本 new_fw_search.sh 在线检查一下官方是否有新版本。

6 使用Arduino IDE编译固件

1) 先在电脑上安装Arduino IDE，Arduino IDE到这里下载:
https://www.arduino.cc/en/Main/Software

2) 把BakeBit/Firmware/Source/下的FastLED-FastLED3.1目录复制到Arduino IDE安装目录下的libraries子目录，在macOS下该路径为: /Applications/Arduino.app/Contents/Java/libraries/

3) 用Arduino IDE打开BakeBit项目文件：
BakeBit/Firmware/Source/bakebit_v1.0.0/bakebit_v1.0.0.ino

4) 在Arduino上进入Tools菜单，把Board的类型改为Arduino Nano:

5) 在Arduino上进入Sketch菜单，选择 Export Compliled Binary，Arduino将执行编译。

6) 编译成功后，在源代码目录下， 会生成一个名为bakebit_v1.0.0.ino.eightanaloginputs.hex的二进制文件，将其更名为 bakebit_firmware.hex，上传到NanoPi NEO上并覆盖BakeBit/Firmware/下的同名文件，用上一章节介绍的方法，执行firmware_update.sh脚本重新烧写固件即可。

7 相关资料

• [Schematic](BakeBit - NEO Hub.pdf)