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

BakeBit - NEO Hub_Top BakeBit - NEO Hub_Bottom

  • 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:

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:
BakeBit-UpdateFirmware.jpg
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:
BakeBit-ArduinoBoardType.jpg
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