UTIME MICROPYTHON SERIAL
Open a command terminal on your host computer (not a serial terminal!).
UTIME MICROPYTHON CODE
However, rather than trying to deal with uploading 2 files to the ESP32, we are just going to worry about putting our code in main.py and uploading that. In essence, main.py acts as a forever loop for our code. Note that once main.py finished executing, it will be run again (over and over again forever). As soon as the microcontroller receives power (or directly after a reset), the code in boot.py will be run. In most configurations of MicroPython, you will find two files stored on the microcontroller: boot.py and main.py. To upload the program to the ESP32, we first need to rename it to main.py. Save the code with a name like button.py. # Wait for button 0 to be pressed, and then exit In your text editor of choice, enter the following code: language:python Good news! We can do this experiment with just the ESP32 Thing board by itself. In the following experiment, we will build a tool that allows us to press the ESP32 Thing's onboard button (labeled 0 on the board) to stop our program and return to REPL. The ampy tool requires REPL to upload new programs, so if the ESP32 is stuck running one of our programs, you will not be able to upload a new program. The only way to stop a forever loop like this is to open a serial connection to the ESP32 and send it a ctrl + c command to terminate the running program. There is one minor problem with MicroPython on the ESP32 that we will address in this experiment: if your code includes a forever loop, the MicroPython interpreter will continue to run your code (forever!), which means we never get a REPL prompt.
UTIME MICROPYTHON HOW TO
This time, we are going to show two examples: how to respond to a button press and how to blink the onboard LED by writing code in a text editor and uploading that file to the ESP32. In the REPL section, we saw how to control an LED by individually calling commands in the REPL. you cannot modify tuples after instantiation.Share on Twitter Share on Facebook Pin It Experiment 1: Digital Input and Output Print(address_book) # expect '2604 Crosswind Drive' Tuple keys (names) are associate with values (details). Print(networks) # expect 'wifi' DictionariesĪ dictionary is like an address-book where you can find the address or contact details of a person by knowing only his/her name, i.e. ListsĪ data structure that holds an ordered collection (sequence) of items. This means there’s no need to declare the sizes of lists, dictionaries, strings, etc. The main difference (regarding data structures) between C and Python is that Python manages memory for you. Python has a number of different data structures for storing and manipulating variables. Welcome( "Alex") # expect "Hello, Alex!" Data Structures The next function takes an input name and returns a string containing a welcome phrase. def add (number1, number2): return number1 + number2 The function below takes two numbers and adds them together, outputting the result.
All data that is passed to a function is explicitly passed. the parameters) and can optionally return data (the return value). Data can be passed into it to be operated on (i.e. x = 0 while x < 9:įunctions are blocks of code that are referred to by name. In this case, the loop checks if x is less than 9 each time the loop passes. While loops are similar to for loops, however they allow you to run a loop until a specific conditional is true/false. This allows you to cycle your code and repeat functions/assignments/etc.įor loops allow you to control how many times a block of code runs for within a range. Loops are another important feature of any programming language. The example below shows how a temperature sensor might be implemented in code. variable = "Hello World"Ĭonditional statements allow control over which elements of code run depending on specific cases. Below is an example of setting a variable equal to a string and then printing it to the console.
Variable AssignmentĪs with Python 3.5, variables can be assigned to and referenced. To get you started with Python (MicroPython) syntax, we've provided you with a number of code examples.
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