BPI-UNO arduino UNO board

From Banana Pi Wiki
Revision as of 23:03, 16 August 2019 by Sinovoip (talk | contribs) (输入输出)
Jump to: navigation, search


The BPI-UNO Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.

Main spec

  • ATmega328P @16 MHz.
  • 32 KB Flash.
  • 2 KB SRAM.


Hardware inerface

BPI-UNO arduino 1.png

Hardware spec

Banana Pi BP-UNO
Microcontroller ATmega328P
Operating Voltage 5V
Input Voltage: (recommended) 7-12V
Input Voltage: (limits) 6-20V
Digital I/O Pins 14(include 6 PWM output)
Analog Input Pins 6个
I/O output Max 20mA
3.3V output Max 50mA
Flash 32KB(ATmega328P) and 0.5KB used by bootloader
SRAM 2KB(ATmega328P)
EEPROM 1KB(ATmega328P)
Clock Speed 16MHz
onboard LED 13
size same as arduino NANO

There is a self-restoring fuse on the bpi-uno that automatically disconnects the power supply when short-circuiting or overcurrent exceeds 500mA, thus protecting the USB port and bpi-uno of the computer. While most computer USB ports provide internal protection, this fuse provides additional protection.


BPI-NANO can power with MicroUSB port,PH2.0 port and VIN port.

Power dependent pins are as follows:

  • PH2.0 port: can input 7-12V,It can be controlled by a power switch。
  • 5V:5V power PIN。when use USB power,direct output USB supplied 5V voltage;When using external power supply, output 5V voltage after voltage stabilization压。
  • 3V3:3.3V power output PIN。output Max is 50 mA。
  • VIN:Connect to external dc 5V power supply
  • REF:I/O reference voltage. Other devices can identify the development board I/O reference voltage through this pin。

Note:FT232RL will only work if it is powered through the USB port。

Input and Output

Each of the 14 digital pins on the BPI-UNO can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have specialized functions: Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip. External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.

Some of them have special functions and these pins are as follows:

  • Serial:0(RX)、1(TX),Used to receive (RX) and transmit (TX) TTL serial data. These pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip。
  • xternal Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value
  • PWM output:BPI-NANO have 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.
  • SPI:10(SS)、11(MOSI)、12(MISO)、13(SCK),These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language。
  • L13:There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.。
  • I2C: 4 (SDA) and 5 (SCL). Support I2C (TWI) communication using the Wire library (documentation on the Wiring website).

BPI-NANO have 6 analog inputs, each of which provide 10 bits of resolution (i.e. 1024 different values). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the analogReference() function. Additionally, some pins have specialized functionality:

There are a couple of other pins on the board:

  • REF:Reference voltage for the analog inputs. Used with analogReference().
  • Rst:Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.



  • ON:电源指示灯。当BPI-UNO通电时,ON灯会点亮。
  • TX:串口发送指示灯。当使用USB连接到计算机且BPI-UNO向计算机传输数据时,TX灯会点亮。
  • RX:串口接收指示灯。当使用USB连接到计算机且BPI-UNO接收到计算机传来的数据时,RX灯会点亮。
  • L13:可编程控制指示灯。该LED通过特殊电路连接到BPI-UNO的13号引脚,当13号引脚为高电平或高阻态时,该LED 会点亮;低电平时,不会点亮。可以通过程序或者外部输入信号,控制该LED亮灭。



ATmega328 提供了UART TTL (5V)串口通信,其位于0 (RX) 和1 (TX)两个引脚上。Uno上的ATmega16U2会在计算机上模拟出一个USB串口,使得ATmega328 能和计算机通信。Arduino IDE提供了串口监视器,使用它可以收发简单文本数据。Uno上的RX\TX两个LED可以指示当前Uno的通信状态。


ATmega328也支持I2C (TWI)和SPI通信。Arduino IDE自带的Wire库,可用于驱动I2C总线,自带的SPI库,可用于SPI通信。


一些开发板在上传程序前需要手动复位,而BPI-UNO的设计不需要如此,在BPI-UNO连接电脑后可以由程序控制其复位。在ATmega16U2上的DTR信号端,经过一个100nf 的电容,连接到ATmega328 的复位引脚。

当计算机发出DTR信号时(低电平),复位端将得到一个足够长的脉冲信号,从而复位ATmega328。在Arduino IDE中点击上传程序,在上传前即会触发复位,从而运行引导程序,完成程序上传。

Arduino Software

Arduino IDE

You can program the PI-NANO through Arduino IDE。

On the BPI-Nano using ATmega328 chip, there is a bootloader program stored, allowing users to upload the program to the development board, without the need for additional programmers. The process of uploading the program was completed using the STK500 protocol.

You can also upload the program to bpi-uno via the ICSP interface without using bootloader

Arduino driver install

  • 1,Windows10 :Windows10 Plug in BPI-Nano and the driver will be installed automatically
  • 2,Windows7 :

After plugging in bpi-uno, the system will try to install the driver automatically. If the installation fails, it will display, "failed to install the driver device successfully". In this case, the driver can be installed manually: Right click on "my computer", device manager, other devices; Right click on "unknown device" and click "update driver software" :

BPI-UNO win1.png

Select the second item, "browse the computer to find driver software";

BPI-UNO win2.png

Click browse and select the driver address, which is the location of the driver in the ArduinoIDE you downloaded:

BPI-UNO win3.png

BPI-UNO win4.png

If the following prompt appears during installation, select "install" :

BPI-UNO win5.png

System prompt: driver installed successfully:

BPI-UNO win6.png

In the device manager, you can see the COM port for Arduino:

BPI-UNO win7.png

then you can find COM port in Arduino IDE

BPI-UNO win8.png

now, you can program with the Arudino IDE.

The resources

  • Schematic diagram download :
  • DXF file download: