The second clearly enables the use of the MPR121 in our code. Import two extra libraries for use with the MPR121 The first “busio” enables our code to access the I2C interface that the MPR121 uses for communication. Board enables us to interact with the GPIO, digitalio is used to control the state of a GPIO pin. The next two, “board” and “digitalio” are CircuitPython specific libraries. The first is “time” and this is used to control the pace of our code. Any conductive objects will work, aluminium foil and card is a cheap and easy way to make fun touch interfaces.ġ. Using crocodile clips, connect a banana to input 0 of the MPR121, attach the other banana to input 1. Using a Capacitive Touch Sensor With CircuitPython With the test complete we can move on to Project 2. The LED should now flash on and off every 0.1 seconds. Your code should look like this import time Create a while True loop which will turn the LED on (led.value = True) and off (led.value = False) every 0.1 seconds. Our LED is connected to GPIO 17, which in CircuitPython is board.D17. Using an object, led, we tell CircuitPython which GPIO pin we are using, and that it is an output. Open the Thonny editor and import three libraries of code. The wiring for this project looks as follows.ġ. For this project we shall wire up an LED to GPIO 17 via two jumper wires and a 330 Ohm resistor. It enables us to be certain that our code is working and that our wiring is sound. This section is found at the extreme left hand side of the screen.The humble flashing LED is always the first test for a new electronics project. We can open and create multiple files for a single project here in the editor window. In the editor section, we write our program code which is then executed and run onto the Raspberry Pi Pico module serially. Delete: Clears the messages in the Shell Micro-python terminal.Syntax Check: This is a very helpful feature that helps us check any syntax mistakes in the program code in the editor.Redo: This icon restores the program code which was erased by the undo button.Undo: By clicking on this icon the last change done to the program code is erased and it goes back to its previous state.Connect/Disconnect: Tools>Serial is used to connect your module through the serial.Stop: By clicking on this icon the execution of the program code stops.Download and run: This button uploads the program code written in the editor onto your module and runs it.Save file: By clicking on this icon the file will be saved automatically.Open file: This icon opens up previously saved files.New file: By clicking on this icon a new file will be created in the editor.There are many integrated development environments available that can be used to write programs for Raspberry Pi Pico. In order to do that we need to first install an IDE. Now we will learn how to use Raspberry Pi Pico in Micro-python firmware. Boards running MicroPython – MicroPython Forum.You can look in these guides to find more information on supported boards for MicroPython There are many MicroPython supported boards available in the market. There are several devices which can be run through this software but for now, we will focus on Pi Pico. Led=Pin(25,Pin.OUT) #create LED object from pin25, Set Pin25 to output Last but not the least important reason to use MicroPython is that it contains REPL (Read-Evaluate-Print Loop) which let us run the code on boards without going through program compilation process.Īs compared to C and other embedded programming languages, the LED blinking code for Raspberry Pi Pico can be written in few lines as shown: Therefore, the main objective of MicroPython developers is to make embedded programming as simple as possible so that hobbyists, researchers, teachers, educators, and beginners can easily learn and dive into the embedded field. On top of that, we can use it to program embedded boards. Because MicroPython is similar to python. Another important is that the Python programming language is easier to learn and all beginners find it very easy when comes to the learning curve for Python as compared to C and C++. The reason for Micro-python being used so readily in the embedded fields is because it is a simple and easy to learn software development language even for beginners than C and C++.
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