Intro to Python with GPIO

Intro to Python with GPIO

• 1.
  Introduction to PythonIntroductionto Python ProgrammingProgramming
• 2.
  Why Python?Why Python? Python is what is referred to as an object-oriented programming language (OOP)  Python is a general purpose programming language. That means you can use Python to write code for a number of programming tasks. ◦ Google search engine ◦ Gaming ◦ Processing financial transactions ◦ Data Analytics ◦ Physical Programming  Simple  Less Syntax  Extensive User Community  Interpreted
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  Interpreted?Interpreted? Python is interpreted,which means that python code is translated and executed by an interpreter one statement at a time. This means you can run commands/code on the command prompt… Through a command prompt with a text file… Using an IDE
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  What Does ItLook Like?What Does It Look Like?
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  Parts of aPython ProgramParts of a Python Program Def: Source Code is the program text entered into an interpreter by the programmer. ◦ The saved file is referred to as, the source file. ◦ The main file in a python program, called main ◦ Can program on the command prompt The extension to a python source file is “.py” ◦ Xcel - .xls ◦ Power Point - .ppt Two main parts to a source file ◦ Modules ◦ Main code
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  Good Programming ProclamationsGoodProgramming Proclamations Using comments to denote programs or sections of code ◦ A comment beginning with # is called a single-line comment because it terminates at the end of the current line. ◦ You also may use a multi-line comment—possibly containing many lines—begins with ’’’ and ends with ’’’. You use blank lines, space characters and tab characters (i.e., “tabs”) to make programs easier to read. ◦ Together, these characters are known as white space. ◦ White-space characters are USUALLY ignored by the interpreter. ◦ Python has its own rules with white space
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  ModulesModules  A moduleis a python source file that has prewritten python code.  These predefined files allow users to utilize code that has been previously developed. ◦ Don’t have to recreate the wheel, just use the wheel and improve on the technology.  math  time  gpiozero  os  Code: Importing modules  import module_name  from module_name import class_name
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  ExpressionsExpressions • A programmingexpression is a combination of symbols to represent a value. • One side of an equation • Ex. • 5+7 • False • print() • led.on()
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  Printing a Lineof TextPrinting a Line of Text print(“ “) Anything placed inside the quotes will be printed on the screen upon execution of the print command.
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  Manipulating TimeManipulating Time Thetime module is a popular module which provides functions for working with times and converting between them. ◦ sleep ◦ local time ◦ epoch time Code: ◦ Importing time module  import time ◦ Using time functions  time.sleep(#)  time.localtime(time.time())
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  Manipulating LED’sManipulating LED’s The Raspberry Pi comes with a library RPi.GPIO that allow the manipulation of GPIO pins: ◦ Setup pins as inputs or outputs ◦ Read inputs, Set output levels ◦ Cleanup  Code: ◦ Importing gpio module  import RPi.GPIO as GPIO  GPIO.setmode(GPIO.BCM) ◦ Setup an LED  GPIO.setup(pin#, GPIO.OUT) ◦ Using led functions  GPIO.output(pin#,GPIO.HIGH)  GPIO.output(pin#,GPIO.LOW)
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  CheckpointCheckpoint 1. What isan IDE? 2. What is a comment and its importance? 3. How is white space used in programming? 4. What are modules? 5. Name 2 modules