/*! Copyright (c) 2018 Siemens AG. Licensed under the MIT License. */
import { SensorIo } from "..";
/**
 * Handles IO communication for a digital pin. Only allows read.
 *
 * The pin should be given in the parameters in the field 'pin'.
 *
 * Note: this class requires the `mraa` npm library to be installed on the
 * board.
 */
export declare class InputGpio extends SensorIo {
    private _gpio;
    constructor(parameters?: any);
    /**
     * Returns the value of the digital pin.
     */
    read(callback: (value: any) => void): void;
    /**
     * Unsupported operation, throws an error.
     */
    write(value: any): void;
}