The LightSensor Component

The LightSensor component provides functionality to monitor brightness levels using a camera. It supports setting exposure levels and provides real-time brightness data through a callback function.

Starting the LightSensor

To start monitoring brightness, use the start method. You can specify an optional frequency (in milliseconds) and an optional camera ID.

Protobject.LightSensor.start(200, 0); // Starts with a refresh frequency of 200 ms using camera ID 0

Setting Exposure

Adjust the exposure of the camera to enhance or reduce brightness detection:

Protobject.LightSensor.setExposure(50); // Sets exposure to 50% (if supported)

Handling Brightness Data

To handle the brightness data, set a callback function using the onData method. This callback function will be called with the brightness value whenever it changes:

Protobject.LightSensor.onData((brightness) => {
    console.log("brightness: " + brightness);
});

Stopping the LightSensor

To stop monitoring and release camera resources:

Protobject.LightSensor.stop();

Showing Video Preview

To enable the display of the video stream, call the showPreview method, specifying the dimensions and position of the canvas.

Protobject.LightSensor.showPreview({ top: 50, left: 50, width: 640, height: 480 });

Hiding Video Preview

To hide the video preview, use the hidePreview method.

Protobject.LightSensor.hidePreview();