Tessel 2: Pairing JavaScript and the Internet of Things with Ease

Tessel 2: Internet of Things development tool based on JavaScript and Node.js

Tessel 2 is a microcontroller that allows developers to create networked devices using JavaScript and Node.js. Its core runs Linux system, and Node.js runs on it, allowing access to a large number of npm modules.

Tessel 2 microcontroller used in this demonstration

The main features of Tessel 2:

• JavaScript and Node.js support:Simplify the development process and leverage the huge npm ecosystem.
• Built-in Wi-Fi and Ethernet: Easy to connect to the network, support remote code push and operation, without the need to continuously connect to USB.
• Four onboard LEDs: ERR (red), WLAN (amber), LED0 (green) and LED1 (blue), can be controlled through the tessel.led array in JavaScript to achieve Various visual effects.
• Rich module compatibility: Supports various modules such as accelerometers and climate modules, ideal for IoT projects.

Quick hand-operated guide:

Preparation:

Make sure your computer has Node.js v4.2.0 or higher installed (recommended v4.4.3 to avoid compatibility issues with Tessel 2). You can use the node -v command to check the version.

Installing Tessel CLI:

Use the following command to install Tessel's command line interface through npm:

<code class="language-bash">npm install -g t2-cli</code>

Find your Tessel:

Connect Tessel to USB port, after booting (about 30 seconds), run the following command to find Tessel:

<code class="language-bash">t2 list</code>

You can rename Tessel using the t2 rename "你的Tessel名称" command.

Connect to Wi-Fi:

Connect Tessel to Wi-Fi network using the following command:

<code class="language-bash">t2 wifi -n "你的Wi-Fi名称" -p 你的Wi-Fi密码</code>

Push code over Wi-Fi:

Run the following command to set up the public and private keys to push the code to Tessel over Wi-Fi:

<code class="language-bash">t2 provision</code>

Run againt2 list and you should see Tessel listed in both USB and Wi-Fi devices.

Update Tessel firmware:

Run the following command to update the Tessel firmware:

<code class="language-bash">t2 update</code>

The first color Tessel application:

Create a folder called "rainbows", enter the folder in the terminal, and run the following command to initialize the Tessel application:

<code class="language-bash">t2 init</code>

Modify the index.js file to make all four LEDs blink:

<code class="language-javascript">var tessel = require("tessel");

tessel.led[0].on();
tessel.led[2].on();

setInterval(function() {
  tessel.led[0].toggle();
  tessel.led[1].toggle();
  tessel.led[2].toggle();
  tessel.led[3].toggle();
}, 80);

console.log("Rainbow madness! (Press CTRL + C to stop)");</code>

Run code: t2 run index.js

Summary:

This guide introduces the basic setup and use of Tessel 2. The subsequent article will introduce more applications of Tessel 2, such as the use of GPS modules.

FAQ:

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Tessel 2 Why is it suitable for IoT projects?

Tessel 2 supports JavaScript, is easy to use, has built-in Wi-Fi and Ethernet, and supports a variety of modules, making it an ideal choice for IoT projects.

How does Tessel 2 compare to other IoT development platforms?

Tessel 2 stands out for its ease of use and versatility, with its intuitive setup process and clear documentation making it easy to get started.

Is Node.js possible for Tessel 2?

Yes, Tessel 2 is fully compatible with Node.js and can be extended with the npm package.

What projects can I make with Tessel 2?

Tessel 2 can be used in a variety of IoT projects, from simple temperature sensors to complex home automation systems.

How to get started with Tessel 2?

Install the Tessel CLI, connect Tessel 2 to the computer, and start programming using JavaScript.

What are the hardware specifications of Tessel 2?

Tessel 2 comes with a 580MHz Mediatek MT7620n processor, 64MB DDR2 RAM and 32MB flash memory, built-in Wi-Fi and Ethernet, and has two USB ports.

Can Tessel 2 be used without the Internet?

Yes, Tessel 2 works offline, but some features (such as remote updates) require an internet connection.

How to debug a Tessel 2 project?

You can debug using the Tessel CLI and the Node.js debugger.

Is there another programming language available for Tessel 2?

Although it mainly supports JavaScript, there are experimental Python and Rust support.

What power supply does Tessel 2 need?

Tessel 2 requires a 5V power supply and can be connected to a computer or USB power adapter using a mini USB port.

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