NodeBots are robots and other physical-computing projects controlled with JavaScript. A common way to build one is with Johnny-Five: Node.js runs your JavaScript, Johnny-Five provides APIs for hardware components, and a compatible board connects that software to LEDs, sensors, motors, and other devices. In a typical Arduino setup, the code runs on your computer and communicates with the board over USB—not on the Arduino itself.
What are NodeBots?
NodeBots describes the community and practice of using JavaScript to control physical machines. Projects can range from a blinking LED to a robot that reads sensors and moves in response. Johnny-Five is a JavaScript robotics and IoT framework used in many NodeBots projects; it provides component APIs that let a program work with supported boards and connected devices.
The parts have distinct jobs:
- Node.js provides the environment that runs JavaScript outside a web browser.
- Johnny-Five offers APIs for working with hardware components.
- A board provides physical inputs and outputs and connects to the software.
- Firmware or an I/O plugin provides the board-specific communication layer.
- Components such as LEDs, buttons, sensors, servos, and motors interact with the physical world.
How does JavaScript control an Arduino?
In the usual Johnny-Five Arduino arrangement, Node.js runs on a host computer. The Arduino runs compatible firmware and receives basic input/output commands from the host over USB serial. Johnny-Five’s board support documentation describes this host-based setup and distinguishes it from boards that can run Node.js directly or use a platform-specific I/O plugin: Johnny-Five platform support.
This distinction matters when choosing hardware. Do not assume that every Arduino-compatible board has the same setup, connection, or capabilities. Check the documentation for the exact board and confirm that it supports the functions your project needs, such as digital or analog I/O, PWM, I2C, servos, or motors.
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What do you need to get started with Johnny-Five?
- A computer or supported board environment that can run a supported Node.js release; Johnny-Five recommends Node.js LTS.
- A board whose current platform instructions match your project and setup.
- Any required board firmware or I/O plugin.
- At least one supported component, such as an LED, connected according to the board’s electrical requirements.
- A project folder where you can install Johnny-Five and run a JavaScript file.
A kit may reduce the effort of finding compatible parts, but check its current contents, documentation, and board compatibility before buying. NodeBots points beginners to the Johnny-Five Inventor’s Kit and Arduino-based kits; its page describes the Inventor’s Kit as supporting 12 robotics and IoT projects. That is the page’s description, not a guarantee about current availability or kit contents: NodeBots.
How to make a first NodeBots project: blink an LED
- Choose and set up the board. Read the current instructions for your specific board before connecting it. Confirm the required firmware or runtime, connection method, and supported I/O features in the platform support documentation.
- Install Node.js. Use a supported release, preferably the LTS release recommended by Johnny-Five.
- Install Johnny-Five in your project. In a terminal opened in the project folder, run
npm install johnny-five. - Connect a suitable LED. Follow the board and component instructions for the correct pin, polarity, and any required current-limiting resistor. Do not infer safe wiring from software examples alone.
- Run a board-ready LED program. Johnny-Five’s introductory example waits for the board’s
readyevent before creating an LED object and blinking it. Waiting ensures the program does not try to use the component before the board connection is ready. The official example and setup guidance are at Johnny-Five.
For Arduino, firmware is part of the setup, not an optional detail. The NodeBots page names StandardFirmata, while Johnny-Five setup material identifies StandardFirmataPlus for Arduino. Do not treat those firmware variants as interchangeable by assumption; follow the current instructions for your exact board and Johnny-Five version.
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Can you make a robot with Node.js?
Yes. The same general approach can grow from an LED to inputs and movement: read a button or sensor, then use the program’s logic to respond with an indicator, servo, or motor. Johnny-Five documents component classes across these categories in its API reference.
A sensible learning progression is:
- Make an LED blink to learn board setup and output control.
- Add a button or sensor to read an input.
- Use the input to change an output, such as turning on an LED when a button is pressed.
- Move on to a servo or motor after checking the board’s support and the component’s power and wiring requirements.
More complex projects depend on the board’s actual I/O capabilities and how JavaScript communicates with it. A component API does not remove the need to check electrical limits, power requirements, and board-specific setup.
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How to choose a board or kit
Compare candidates against the project you want to build rather than choosing by name alone.
| What to check | Why it matters |
|---|---|
| Where JavaScript runs | Some setups run Node.js on a tethered computer; others can run it directly on a Linux-capable board. |
| Firmware, runtime, or I/O plugin | The communication layer and setup instructions vary by platform. |
| Connection method | USB serial, Wi-Fi, Bluetooth, or another route can change how the project is configured. |
| Supported I/O | Confirm support for the specific analog, digital, PWM, I2C, servo, motor, or sensor functions your project needs. |
| Kit contents and instructions | Verify that the kit currently includes the board and components needed for the project, and that its instructions match the setup you plan to use. |
The Johnny-Five platform page documents differences between supported board setups, including host-based Arduino use and environments that run Node.js on the board. Some listed platforms may be older, so use the page to identify the relevant setup and then confirm current compatibility for your chosen hardware: platform support.
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What to read next
The Johnny-Five home page is the most direct starting point for its installation flow and LED example: Johnny-Five: The JavaScript Robotics & IoT Platform. For the range of component classes, consult the API documentation. The NodeBots site offers project and kit context, though its product references may be historical. Arduino’s 2016 introduction also demonstrates the basic idea of controlling an Arduino with Node.js and Johnny-Five; it is useful as an introduction, not as a current compatibility guarantee: Getting Started with Johnny-Five for IoT.
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