DIY物聯網小型氣象站(NodeMCU + BMP180)[附code及接線圖]

早排接觸到NodeMcu呢樣玩意，類似WiFi版既arduino
用佢來整左個Wifi Weather Station, 量度氣溫，氣壓，濕度，然後upload上thingspeak，咁就可以用電腦 / 電話隨時睇返

大家可以上: https://thingspeak.com/channels/51245 呢個網睇到最新既氣象數據

Weather station主要由NodeMCU(ESP8266) + DHT11 (濕度計) + BMP180 (溫度 + 氣壓計)組成，D sensor 同nodemcu都係上taobao買

Wiring 就如圖:

P.S. : 如果係淘寶果D DHT11 Module，多數已經有10K的上拉電阻，不用再加

實物圖:

Program 方面就用Arduino IDE，係Board Manager 加入 ESP8266
(詳見: http://ruten-proteus.blogspot.hk ... rt-arduino-ide.html 「ESP8266 硬體套件安裝」果一part )

Code:

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <Wire.h>
#include <Adafruit_BMP085.h> //Download link: https://github.com/adafruit/Adafruit-BMP085-Library
#include "DHT.h" //Download link: https://github.com/adafruit/DHT-sensor-library
#define DHTPIN 4
DHT dht(DHTPIN, DHT11);
Adafruit_BMP085 bmp;
WiFiClient client;
String apiKey = "打返你的thingspeak api key";
const char* ssid = "你的SSID";
const char* password = "你的WIFI PW";
const char* server = "api.thingspeak.com";
void setup() {
Serial.begin(115200);
delay(10);
Wire.begin(0, 2);
if (!bmp.begin()) {
Serial.println("Could not find a valid BMP180 sensor, check wiring!");
while (1);
}
dht.begin();
WiFi.begin(ssid, password);
Serial.println();
Serial.println();
Serial.print("Connecting with ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print("Connect failed");
}
Serial.println("");
Serial.println("WiFi Connected");
}
void loop() {
float temp = bmp.readTemperature();
float pressure = bmp.readPressure();
pressure = pressure / 100; //Convert to hPa
float humidity = dht.readHumidity();
if (client.connect(server, 80)) {
String postStr = apiKey;
postStr += "&field1=";
postStr += String(temp, 2);
postStr += "&field2=";
postStr += String(pressure, 2);
postStr += "&field3=";
postStr += String(humidity, 2);
postStr += "\r\n\r\n";
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(postStr.length());
client.print("\n\n");
client.print(postStr);
Serial.println("Temp: " + String(temp) + " Pressure: " + String(pressure) + " Humidity: " + String(humidity));
Serial.println(postStr);
}
client.stop();
delay(5000);
}