Orange Pi One/Lite (Tutorial): use the GPIO in Python, pinouts

https://diyprojects.io/orange-pi-onelite-tutorial-use-gpio-python-pinouts/#.WZR4hVzo6Ts

Orange Pi One/Lite (Tutorial): use the GPIO in Python, pinouts

 
Orange Pi has a 40-pin extension connector (GPIO) compatible with the Raspberry Pi (model B +). In this tutorial, we will install python as well as the pyA20 library adapted to the GPIO of Orange Pi. On paper, the connector is compatible, only flat the call of the pins is different which requires to resume Python programs developed for The Raspberry. This is a bit of a shame but the very attractive price of the Orange Pi range remains a weighty argument.
For this tutorial, I used Armbian installed on an Orange Pi Lite (Wi-Fi version). The GPIO is the same throughout the Orange Pi range except the Orange Pi Zero which has a 26-pin GPIO.

Installing Python and Libraries

Let’s start by preparing the environment by installing Python

sudo apt-get install python-dev

1	sudo apt-get install python-dev

Then install the pyA20 library

sudo pip install pyA20

1	sudo pip install pyA20

Now we need to install the library to manage the Orange Pi GPIO. Place yourself in your home folder (eg /home/ft) and then clone the pyH3 library (https://github.com/duxingkei33/orangepi_PC_gpio_pyH3). This is an adaptation made by Duxingkei Chow of the library “python control orangepi_PC ext GPIO ALLwinner H3” based on the “pyA20 0.2.1” library.

cd /home/pi git clone https://github.com/duxingkei33/orangepi_PC_gpio_pyH3

1 2	cd /home/pi git clone https://github.com/duxingkei33/orangepi_PC_gpio_pyH3

Enter the library directory

cd orangepi_PC_gpio_pyH3

1	cd orangepi_PC_gpio_pyH3

And run the installation (it is better to do the previous command with a sudo if you are not logged in as root).

sudo python setup.py install

1	sudo python setup.py install

Correspondence of pins between Orange Pi and Raspberry Pi (model B+)

As I mentioned in the introduction, the expansion slot is compatible with the Raspberry B + (40-pin). However, the location is different.

Raspberry Pi	Orange Pi	Pin (Left column)	Broche (Right column)	Orange Pi	Raspberry Pi
	3V3	1	2	+5V	+5V
GPIO2 SDA1 I2C	PA12	3	4	+5V	+5V
GPIO3 SCL I2C	PA11	5	6	GND	GND
GPIO4	PA6	7	8	PA13	GPIO14 UART_TXD
GND	GND	9	10	PA14	GPIO15 UART_RXD
GPIO17	PA1	11	12	PD14	GPIO18 PCM_CLK
GPIO27	PA0	13	14	GND	GND
GPIO22	PA3	15	16	PC4	GPIO23
3V3	3V3	17	18	PC7	GPIO24
GPIO10 SPI0_MOSI	PC0	19	20	GND	GND
GPIO9 SPI0_MISO	PC1	21	22	PA2	GPIO25
GPIO11 SPI0_SCLK	PC2	23	24	PC3	GPIO8 SPI0_CE0_N
GND	GND	25	26	PA21	GPIO7 SPI0_CE1_N
ID_SD I2C ID EEPROM	PA19	27	28	PA18	ID_SC I2C ID EEPROM
GPIO5	PA7	29	30	GND	GND
GPIO6	PA8	31	32	PG8	GPIO12
GPIO13	PA9	33	34	GND	GND
GPIO19	PA10	35	36	PG9	GPIO16
GPIO26	PA20	37	38	PG6	GPIO20
GND	GND	39	40	PG7	GPIO21

Just like the Raspberry Pi, the output voltage is 3.3V.
Finally the last difference (and not least!), The connector is turned 180 degrees compared to that of the Raspberry. Needless to say that it will be necessary to use a connection for breadboard with a flexible cable if you want to connect the Orange to a breadboard (breakout) connection.

Lighting a Python Led

For this first tutorial on the GPIO of Orange Pi, we will not go far. Either way it’s exactly the same as Raspberry. There is only the call of the pins that differs.
Create a new file. For example test.py

nano test.py

1	nano test.py

Paste the following code and save with Ctrl + X then Y. This code is very simple, it lights for 2 seconds a LED connected to the PG7 pin (equivalent to the Raspberry GPIO21). Connect a LED on pin PG7 (the last one in the right column) to a GND via a 220Ω resistor.

Python

#import the library / Import des librairies from pyA20.gpio import gpio from pyA20.gpio import port from time import sleep #initialize the gpio module / initialise le GPIO gpio.init() #setup the port (same as raspberry pi's gpio.setup() function) #Configure la broche PG7 (equivalent au GPIO21 du Raspberry) comme une sortie gpio.setcfg(port.PG7, gpio.OUTPUT) #now we do something (light up the LED) #Maintenant, on allume la LED gpio.output(port.PG7, gpio.HIGH) #turn off the LED after 2 seconds #Et on eteint après 2 secondes sleep(2) gpio.output(port.PG7, gpio.LOW)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

#import the library / Import des librairies from pyA20.gpio import gpio from pyA20.gpio import port from time import sleep   #initialize the gpio module / initialise le GPIO gpio.init()   #setup the port (same as raspberry pi's gpio.setup() function) #Configure la broche PG7 (equivalent au GPIO21 du Raspberry) comme une sortie gpio.setcfg(port.PG7, gpio.OUTPUT)   #now we do something (light up the LED) #Maintenant, on allume la LED gpio.output(port.PG7, gpio.HIGH)   #turn off the LED after 2 seconds #Et on eteint après 2 secondes sleep(2) gpio.output(port.PG7, gpio.LOW)

We make the script executable

chmod +x test.py

1	chmod +x test.py

If you are not logged in as root, you must preface the python command with a sudo (you will be prompted for the password).

sudo python test.py

1	sudo python test.py

If the wiring is correct, the LED must illuminate for 2 seconds.

Click to enlarge

Now you have everything you need to use the Orange Pi GPIO. It’s a shame the calls are different. Existing programs will not be directly usable. Other regret, the rotation of the connector makes the use of HAT cards much less convenient (and compact!)