BakeBit - NanoHat Hub
Contents
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).
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 |
- 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"