我正在制作一个自动浇水系统，并且有一个nodejs应用程序将数据推送到dynamodb，但是我需要将这些数据解析为json以使其进入highcharts。我认为它完全不会超过我的有效载荷。有关如何获取我的json文件的任何建议。
这是index.js
var raspi = require('raspi-io'),
five = require("johnny-five"),
dhtSensor = require('node-dht-sensor'),
Gpio = require('onoff').Gpio,
waterPump = new Gpio(18, 'out'),
awsDevice = require('./device');
var ioPi = new raspi();
var waterLevelValue, soilValue, temperature, humidity;
var tempSensor = {
initialize: function() {
return dhtSensor.initialize(11, 4);
},
read: function() {
var readOut = dhtSensor.read();
temperature = readOut.temperature.toFixed(2);
humidity = readOut.humidity.toFixed(2)
console.log('Temperature: ' + temperature + 'C, ' +
'humidity: ' + humidity + '%');
setTimeout(function(){
tempSensor.read();
}, 4000)
}
}
var boards = new five.Boards([
{id: 'pi', io: ioPi, debug: true },
{id: 'uno', port: "/dev/ttyACM0", debug: true }
]);
boards.on("ready", function() {
console.log('ready');
if (tempSensor.initialize()) {
tempSensor.read();
} else {
console.warn('Failed to initialize sensor');
}
var led = new five.Led({
pin: 13,
board: this.byId("uno")
});
led.blink(500);
var waterPower = five.Pin({pin: 'D4', board: this.byId("uno")});
var waterLevelSensor = new five.Sensor({ pin: 'A0', enabled: false, board: this.byId("uno") });
waterLevelSensor.on("data", function() {
if(waterPower.isHigh) {
waterLevelValue = this.value;
console.log('water lev: '+this.value);
}
});
var power = five.Pin({pin: 'D7', board: this.byId("uno")});
var soilMoisture = new five.Sensor({ pin: "A1", enabled: false, board: this.byId("uno") });
soilMoisture.on("data", function() {
if (power.isHigh) {
soilValue = this.value;
console.log('soil lev: '+this.value);
}
});
this.byId("uno").loop(15000, function() {
if (!power.isHigh) {
power.high();
soilMoisture.enable();
}
if(!waterPower.isHigh) {
waterPower.high();
waterLevelSensor.enable();
}
});
});
awsDevice.device.on('message', function(topic,payload) {
console.log('message', topic, payload.toString('utf-8'));
console.log(payload);
payloadData = JSON.parse(payload);
if(payloadData['state']['pump'] == 'start') {
waterPump.writeSync(1);
} else {
waterPump.writeSync(0);
}
});
awsUpdater = function() {
setInterval(function() {
data = {'temp': parseFloat(temperature), 'hum': parseFloat(humidity), 'wat': parseFloat(waterLevelValue), 'sol': parseFloat(soilValue)}
awsDevice.device.publish('sensor/data', JSON.stringify(data));
},20000);
}
这是device.js
var awsIot = require('aws-iot-device-sdk');
var device = awsIot.device({
keyPath: '/home/pi/waterpi-web-master/waterpi-node/0f027e888e-private.pem.key',
keyPath: '/home/pi/waterpi-web-master/waterpi-node/0f027e888e-private.pem.key',
certPath: '/home/pi/waterpi-web-master/waterpi-node/0f027e888e-certificate.pem.crt',
caPath: '/home/pi/waterpi-web-master/waterpi-node/rootCA.pem',
host: "a9512mth4mf1f.iot.us-east-2.amazonaws.com",
port: 8883,
clientId: "iotconsole-1520057176406-1",
region: 'us-east-2'
});
device.on('connect', function() {
console.log('connect');
device.subscribe('pump/data');
});
module.exports.device = device
我也制作了一个红宝石网络应用程序，不确定是否上传，如果是，请告诉我。我正在尝试按照本指南https://www.hackster.io/demirhanaydin/waterpi-houseplant-remote-watering-and-monitoring-system-340400#toc-step-1--setup-dynamodb-0进行操作，并参考高级图和红宝石部分。一切都显示在我的数据库中，我只是无法获取json文件，也许我只是感到困惑。