JavaScript can interface with embedded C through various methods, enabling the integration of web technologies with low-level hardware control. One common approach is using WebAssembly (Wasm), a binary instruction format designed for stack-based virtual machines, which allows code written in C (or other languages) to run in web environments alongside JavaScript. Developers can compile their C code into WebAssembly, and then load and execute it within a JavaScript environment, such as a web browser or Node.js. This method combines the performance of C with the flexibility and accessibility of JavaScript.

Another method involves using frameworks like Johnny-Five and Firmata. Johnny-Five is a JavaScript framework for robotics and IoT, while Firmata is a protocol for communicating with microcontrollers from software on a host computer. By uploading the Firmata firmware to a microcontroller, developers can use JavaScript to send commands and receive data from the microcontroller, effectively interfacing with the embedded C code running on the device.

These interfaces enable the development of complex applications that leverage both high-level and low-level programming paradigms. For those interested in exploring this integration further, comprehensive Embedded Systems training in Noida can provide the necessary skills and knowledge.