This tests the ambient light sensor in light intensity percentage

ambientLightSensorTest.swift

/// EV3 Ambient Light Sensor Sample
/// Demonstrates how to poll EV3's light sensor for ambient light information.

import RobotKit

// Initializes a new EV3Robot instance through which all device communication happens.
let robot = try EV3Robot()

// Sets up a light sensor at input port 1.
guard let lightSensor = robot.lightSensor(atPort: .one) else {
	fatalError("No light sensor at the given port!")
}

// Continues until the program is stopped.
while true {
	// Reads the ambient light value as a percent.
	if let percent = lightSensor.light(forMode: .ambient) {
		// Draws everything in one pass for efficiency.
		robot.window.batchDisplayUpdates {
			robot.window.clear()
			robot.window.drawText("Ambient", fontSize: .medium, at: Point(x: 30, y: 20), color: .black)
			robot.window.drawText("light", fontSize: .medium, at: Point(x: 40, y: 40), color: .black)
			robot.window.drawText("intensity:", fontSize: .medium, at: Point(x: 10, y: 60), color: .black)
			robot.window.drawText(String(percent) + "%", fontSize: .medium, at: Point(x: 80, y: 90), color: .black)
		}
	}

	// Pauses for half a second before going again.
	wait(milliseconds: 500)
}