In the Serial Port chooser dialog, select the BBC micro:bit device and click Connect.Clicking the Connect button prompts the user to select the serial device to connect to and then connects to the micro:bit. Our project now has the bare minimum to get started. Script.js - clickConnect() // CODELAB: Add connect code here. Let's also hook up the connect button and have it call connect() when the user clicks it. The BBC micro:bit uses a 9600 baud connection between the USB-to-serial chip and the main processor. We also need to provide the speed at which we want to communicate with the serial device. The requestPort call prompts the user for which device they want to connect to. - Request a port and open a connection. Script.js - connect() // CODELAB: Add code to request & open port here. This prevents the UI from blocking when awaiting input, but it's also important because serial data may be received by the web page at any time, and we need a way to listen for it.īecause a computer may have multiple serial devices, when the browser tries to request a port, it prompts the user to pick which device to connect with. Like most other modern APIs, the Web Serial API is asynchronous. Verify that the page does not show a red banner stating that Web Serial is not supported.If it is, this code hides the banner that says that Web Serial is not supported. This checks whether Web Serial is supported. Script.js - DOMContentLoaded // CODELAB: Add feature detection here.Ĭonst notSupported = document.getElementById('notSupported') In the DOMContentLoaded event, add the following code to your project: To do that, check whether serial is in navigator. The first thing to do is to check whether the Web Serial API is supported in the current browser. Click the Show button, and then choose In a New Window to see your code in action.Ĭheck whether the Web Serial API is supported.Click the Remix Glitch link to create your own version of the starter project.We've put everything you need for this codelab into a Glitch project. The user experience can be improved by providing direct communication between the site and the device that it is controlling. In other cases, the user is required to perform an additional step, such as copying a compiled application to the device with a USB flash drive. In other cases, the application is delivered in a packaged native application through a framework such as Electron. In some cases, these websites communicate with the device through a native agent application that is manually installed by the user. There are many examples of control software being built using web technology. The API bridges the web and the physical world by allowing websites to communicate with serial devices, such as microcontrollers and 3D printers. The Web Serial API provides a way for websites to read from and write to a serial device with scripts. See the BBC micro:bit page on the Espruino site for details on what the micro:bit is capable of. We chose to use the micro:bit for this codelab because it is affordable, offers a few inputs (buttons) and outputs (5x5 LED display), and can provide additional inputs and outputs. Knowledge of HTML, CSS, JavaScript, and Chrome DevTools.A recent version of Chrome (80 or later).A BBC micro:bit board with the latest Espruino firmware.How to send data out via a write stream.
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