Raspberry PI Python Code

It's all standard Python but there is a special library used to talk to the GPIO pins.

Live Python Coding

Just type into a new cell basic math operations



In [8]:

    
1 + 2









    Out[8]:





3



In [18]:

    
1 - 2









    Out[18]:





-1



In [9]:

    
1 * 2









    Out[9]:





0.5



In [9]:

    
1 / 2









    Out[9]:





0.5

Use python to print hello world



In [23]:

    
print("Hello Humans")









    



Hello Humans

Text Variables

Create variables on the fly. Show there values just by typing the variable name.



In [10]:

    
name = "Rick"
name









    Out[10]:





'Rick'



In [ ]:

    
## Variable for numbers



In [22]:

    
yards = 10
yardtraveled = 5
print(yards)
print(yardtraveled)
print(yards - yardtraveled)



In [13]:

    
for ii in  range(0,15):
    print("ii: ",ii)









    



ii:  0
ii:  1
ii:  2
ii:  3
ii:  4
ii:  5
ii:  6
ii:  7
ii:  8
ii:  9
ii:  10
ii:  11
ii:  12
ii:  13
ii:  14



In [ ]:

Access GPIO pins with Python



In [2]:

    
#https://learn.sparkfun.com/tutorials/raspberry-gpio/python-rpigpio-example
import RPi.GPIO as GPIO 
import time

GPIO.setmode(GPIO.BOARD)

#pin definitions:
led1Pin = 12 #pin for left eye
led2Pin = 16 #pin for right eye

dutycycle = 95

#pin setup
GPIO.setup(led1Pin, GPIO.OUT)
GPIO.setup(led2Pin, GPIO.OUT)









    



/usr/local/lib/python3.4/dist-packages/ipykernel/__main__.py:14: RuntimeWarning: This channel is already in use, continuing anyway.  Use GPIO.setwarnings(False) to disable warnings.
/usr/local/lib/python3.4/dist-packages/ipykernel/__main__.py:15: RuntimeWarning: This channel is already in use, continuing anyway.  Use GPIO.setwarnings(False) to disable warnings.



In [3]:

    
#initialize led state
GPIO.output(led1Pin, False)
GPIO.output(led2Pin, False)



In [ ]:

    
while True:
    GPIO.output(led1Pin, True)
    GPIO.output(led2Pin, True)
    time.sleep(0.5)
    GPIO.output(led1Pin, False)
    GPIO.output(led2Pin, False)
    time.sleep(0.5)

GPIO Command line

wiringPi http://wiringpi.com/the-gpio-utility/

shell access: http://elinux.org/RPi_GPIO_Code_Samples#Shell

Low Level Details http://elinux.org/RPi_Low-level_peripherals#Bash_shell_script.2C_using_sysfs.2C_part_of_the_raspbian_operating_system