Example payload
{
"sensor": "temperature",
"value": 22.4,
"unit": "C"
}Hardware Demos
Arduino Serial Bridge to Browser
Any Arduino — even a classic Uno with no WiFi — can feed live sensor data to the browser via a USB serial bridge.
Local workflowLocal setup requiredRequires hardwareSensor Scalar
What this demo proves
A non-networked Arduino (Uno, Mega, Nano, Leonardo) participates in DataNet flows when a local bridge script reads its USB serial output and publishes canonical telemetry. Three bridge paths are provided: Node.js, Python, and browser-native Web Serial API.
Platforms
Arduino (Uno/Mega/Nano)Node.jsPythonBrowser Web Serial APIp5.js
Payload types
IntegerFloatJSON
Channel names
demo.serial.arduinoBridge channel for Arduino serial data forwarded through a local runtime.Compatibility notes
Browser JavaScriptNative
Node.jsNative
PythonNative
p5.jsNative
ProcessingNative
ArduinoJSON wrapped
ESP32 / ESP8266Native
Serial bridgeAdapter required
TouchDesignerNot yet supported
Run online
- The browser bridge (bridge-browser/index.html) is the closest to online-runnable: open it in Chrome or Edge, click 'Connect Arduino', select the USB port, and data flows directly from the board to DataNet — no extra software needed.
- Node.js and Python bridges require a local terminal.
Run locally
- 1. Upload SerialSensor.ino to any Arduino (Uno, Mega, Nano, Leonardo, etc.).
- 2a. Node.js bridge: cd demos/arduino-serial-bridge/bridge-node && npm install && DATANET_API_KEY=ak_... node bridge.mjs
- 2b. Python bridge: pip install pyserial && DATANET_API_KEY=ak_... python demos/arduino-serial-bridge/bridge-python/bridge.py
- 2c. Browser bridge: open bridge-browser/index.html in Chrome/Edge, enter API key, click 'Connect Arduino'.
- 3. Subscribe from the browser playground or p5 sketch on channel demo.serial.arduino.
Expected output
- Arduino emits JSON lines at 115200 baud: {"sensor":"temperature","value":22.4,"unit":"C","n":1}
- Bridge script auto-detects the serial port, publishes each reading to DataNet.
- Temperature and humidity values appear live in any subscribed browser surface.
- Set ROUTE_BY_SENSOR=1 to split into demo.serial.arduino.temperature and demo.serial.arduino.humidity sub-channels.
Troubleshooting
- If no port is detected automatically, set SERIAL_PORT=/dev/ttyUSB0 (Linux), /dev/tty.usbmodem* (macOS), or COM3 (Windows).
- Web Serial API requires Chrome or Edge 89+ — it is not available in Firefox or Safari.
- If values never appear in the browser, confirm the channel name matches on both publisher and subscriber.