homebridge-raspberry-pi-sensehat/dist/sensehatSensorAccessory.js

A Homebridge plugin for Raspberry Pi SenseHAT

import { debounce } from './utils.js';
import { exec } from 'child_process';
/**
 * Platform Accessory "Sensehat Sensor"
 */
export class SensehatSensorAccessory {
    platform;
    accessory;
    temperatureService;
    humidityService;
    pressureService;
    temperature = 0;
    humidity = 0;
    pressure = 700;
    constructor(platform, accessory) {
        this.platform = platform;
        this.accessory = accessory;
        // set accessory information
        this.accessory.getService(this.platform.Service.AccessoryInformation)
            .setCharacteristic(this.platform.Characteristic.Manufacturer, 'Raspberry')
            .setCharacteristic(this.platform.Characteristic.Model, 'SenseHat')
            .setCharacteristic(this.platform.Characteristic.FirmwareRevision, '1.0')
            .setCharacteristic(this.platform.Characteristic.SerialNumber, '1.0');
        // create a temperature sensor service
        this.temperatureService = this.accessory.getService(this.platform.Service.TemperatureSensor) ||
            this.accessory.addService(this.platform.Service.TemperatureSensor, accessory.context.device.displayName, 'sensehat-temperature');
        this.temperatureService.getCharacteristic(this.platform.Characteristic.CurrentTemperature)
            .onGet(this.getCurrentTemperature.bind(this));
        // add a humidity sensor service
        this.humidityService = this.accessory.getService(this.platform.Service.HumiditySensor) ||
            this.accessory.addService(this.platform.Service.HumiditySensor, accessory.context.device.displayName, 'sensehat-humidity');
        this.humidityService.getCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity)
            .onGet(this.getCurrentHumidity.bind(this));
        // add a pressure sensor service (Custom Service)
        this.pressureService = this.accessory.getService(this.platform.CustomService.AirPressureSensor) ||
            this.accessory.addService(this.platform.CustomService.AirPressureSensor, accessory.context.device.displayName, 'sensehat-pressure');
        this.pressureService.getCharacteristic(this.platform.CustomCharacteristic.AirPressure)
            .onGet(this.getCurrentPressure.bind(this));
    }
    // handle get requests from HomeKit for the temperature, humidity and pressure sensor
    async getCurrentTemperature() {
        await this.getSensor();
        return this.temperature;
    }
    async getCurrentHumidity() {
        return this.humidity;
    }
    async getCurrentPressure() {
        return this.pressure;
    }
    getSensor = debounce(async () => {
        await new Promise((resolve, reject) => {
            exec(`${this.platform.pythonName} ${this.platform.scriptPath}/getSensor.py`, (error, stdout) => {
                if (!error) {
                    const values = stdout.split(' ');
                    this.temperature = parseFloat(values[0]);
                    this.humidity = parseFloat(values[1]);
                    this.pressure = parseFloat(values[2]);
                    this.temperatureService.updateCharacteristic(this.platform.Characteristic.CurrentTemperature, this.temperature);
                    this.humidityService.updateCharacteristic(this.platform.Characteristic.CurrentRelativeHumidity, this.humidity);
                    this.pressureService.updateCharacteristic(this.platform.CustomCharacteristic.AirPressure, this.pressure || 700);
                    this.platform.log.debug(`${this.accessory.context.device.displayName} getSensor: ${this.temperature}C ${this.humidity}% ${this.pressure}hPa`);
                    resolve();
                }
                else {
                    this.platform.log.error(`${this.accessory.context.device.displayName} getSensor failed: ${error}`);
                    reject(error);
                }
            });
        });
    }, 1000);
}
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