This project provides a polyfill for the Web Serial API in Deno, enabling serial port communication in Deno applications using a familiar web-compatible interface.

Currently, this project does not ship any pre-built binaries. To use the polyfill, you need to build the native adapter yourself:

1. Clone the repository and navigate to its directory.

2. Build the native binary using Cargo:

   cargo build --release

3. Set the WEB_SERIAL_PATH environment variable to the folder containing the compiled binary (typically target/release):

   export WEB_SERIAL_PATH=/path/to/deno_serial/target/release

4. Use the polyfill in your Deno project as documented.

Make sure you have Rust and Cargo installed.

1. Arduino Blink Sketch

   Upload the following sketch to your Arduino:

   String inputString = "";
   bool stringComplete = false;
   
   void setup() {
       Serial.begin(115200);
       inputString.reserve(200);
   
       pinMode(2, OUTPUT);
   }
   
   void loop() {
       if (!stringComplete) return;
       inputString.trim();
       if (inputString != "OFF" && inputString != "ON") return;
       digitalWrite(2, inputString == "ON");
   
       inputString = "";
       stringComplete = false;
   }
   
   void serialEvent() {
       while (Serial.available()) {
           char inChar = (char)Serial.read();
           inputString += inChar;
           if (inChar == '\n') {
           stringComplete = true;
           }
       }
   }

   Blinking via Web Serial in Deno:

   import "../mod.ts"; // Import the polyfill
   import { delay } from "jsr:@std/async/delay";
   
   // get first available serial port
   const port = await navigator.serial.requestPort();
   await port.open({ baudRate: 115200 });
   
   // read every chunk from the serial port
   port.readable!
       .pipeThrough(new TextDecoderStream())
       .pipeTo(new WritableStream({
           write(chunk) {
               console.log(chunk.trim());
           }
       }));
   
   // blink fast
   const writer = port.writable!.getWriter();
   
   while (true) {
       await writer.write(new TextEncoder().encode("ON\n"));
       await delay(100);
       await writer.write(new TextEncoder().encode("OFF\n"));
       await delay(100);
   }

Apache-2.0. Check LICENSE for more information.