#RPI.GPIO PYTHON LIBRARY REFERENCE HOW TO#
#RPI.GPIO PYTHON LIBRARY REFERENCE CODE#

Model B had two revisions in which the pin configuration changed a little. The following image (sourceВ .uk) shows the pin layout of models A/B (rev 2) and B+.

Hello World with Raspberry Pi вЂ“ LED BlinkyДЄs mentioned earlier, RPi models A/B and B+ are pin compatible.

After this post, you should be able to perform simple I/O operations using your RPiвЂ™s GPIO pins.

#RPI.GPIO PYTHON LIBRARY REFERENCE HOW TO#

In any case, weвЂ™ll learn how to install the library, just in case you find it missing.

The library comes pre-installed with the latest Raspbian OS. The easiest way to control these pins is to useВ the RPi.GPIO Python library. The model B+ is pin compatible with models A and B. Raspberry Pi Models A and B have 26 pins (17 GPIO) whereas the new model B+ comes withВ 40 pins (26 GPIO). These pins allow your RPi to be connected to the external world. Great! Now what? You didnвЂ™t buy a Raspberry Pi just to replace your computer, did you? Well, Raspberry Pi can do a lot moreвЂ¦ much more than your computer can do!Дid you notice that there are lots of tiny little pins on one corner of your RPi? These are called вЂњGeneral Purpose Input OutputвЂќ pins (or GPIO pins).

#RPI.GPIO PYTHON LIBRARY REFERENCE CODE#

InStr = input('Enter something, or q to quit')Д«reak #stops loop, goes to statement after loopДЇunctions are defined (named) blocks of code that help organize sections of a program into specific tasks or functions.So you got your Raspberry Pi, installed an OS and using it just like your computer. The while loop iterates, or loops, while its expression is true. # example with continue - skips rest of code and continues loopДaysOfWeek = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun') The value in each sequence is assigned to the variable in the for statement each loop. The for loop iterates, or loops, through a sequence in a string, list, tuple or dictionary. In Python, the for and while keywords are used to create loops. Loops provide a way to repeat, or iterate, code based on a condition or an expression. Conditional statements are structured as:ДЄlternative statement block if none above is true A variable or expression is tested using the if and then based on the result of the test, additional statements may or may not be executed within the conditional block. This is done primarily through the if and its supporting elif and else keywords. In the arithmetic function 2 + 3, the 2 and 3 are the operands, while the + symbol is the operator.Д®xample of Operators and Operands Conditional StatementsД¬onditional statements handle decision making in a program. Operands are the object, while the operators are the action. Operands are the parts that the operators act upon. They may be mathematical, logical, assignment, comparison, bitwise, membership or identity operators. Operators are the parts that invoke action in a statement. Those with more, or less, spaces or tabs do not belong to the same block. Code statements with the same number of spaces or tabs at the beginning of the line belong to the same block of code. IndentationД«locks of code are delimited, or grouped, through line indentation - by the number of spaces or tabs in front of the statement. Care must be taken when writing code to keep the case of identifiers consistent to avoid program errors, or 'bugs'. Example: variables firstname, firstName and FirstName are three different and unique variables.

Python is a case sensitive language, meaning that it treats upper and lower case letters and identifiers as distinct and different. Syntax - the Basic RulesДЇollowing are some of the basic Python programming language rules. If needed, see our Python Overview and Introduction articles.

It assumes a basic knowledge of Python programming. This article serves as a quick reference to Python's programming syntax, constructs and keywords and is not meant as an introductory tutorial. As Raspberry Pi enthusiasts and developers, we are fortunate that Python is included with our Raspbian operating system! Python is one of the most powerful and popular programming languages of our day. Python Programming Reference for Raspberry Pi

Rpi.gpio python library reference