ESP8266 + Arduino IDE 1.6.5 + DHT22 + SHT20 溫濕度感應器

寫到這主要是作記錄了， 因為合併程式很快就測成功了， 整個程式如下：

#include <Wire.h>
#include <DHT.h>
#include "SparkFunHTU21D.h"
#include <ESP8266WiFi.h>
#define DHTPIN 4
#define DHTTYPE DHT22
// Wifi definition
const char* ssid     = "Buffalo9F-2";
const char* password = "0227057373";
const char* server = "184.106.153.149";
String apiKey = "P1UO6DM0KA8X79SQ";

WiFiClient client;
//Create an instance of the object
HTU21D myHumidity;
DHT dht(DHTPIN, DHTTYPE);

void reConnectAP()
{
  int i = 0;
  WiFi.begin(ssid, password);
  while ((WiFi.status() != WL_CONNECTED) && (i < 100)) {
    delay(500);
    Serial.print(".");
    i = i++;
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("");
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
    myHumidity.begin();
    dht.begin();
  }
}
void setup()
{
  int i;
  Serial.begin(9600);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  reConnectAP();
}
void loop()
{
  if (WiFi.status() != WL_CONNECTED) {
    reConnectAP();
    return;
  }
  // SHT20
  float humd = myHumidity.readHumidity();
  float temp = myHumidity.readTemperature();
  // dht22
  float dhth = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float dhtt = dht.readTemperature();

  if (isnan(humd) || isnan(temp) || isnan(dhth) || isnan(dhtt)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  Serial.print("Sending sht20 data to thingspeak.com\n");
  if (client.connect(server, 80)) { //   "184.106.153.149" or api.thingspeak.com
    String postStr = apiKey;
    postStr += "&field1=";
    postStr += String(temp);
    postStr += "&field2=";
    postStr += String(humd);
    postStr += "&field3=";
    postStr += String(dhtt);
    postStr += "&field4=";
    postStr += String(dhth);
    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.print(postStr);
    Serial.print("\n");
    Serial.print("SHT20 Temperature:");
    Serial.print(temp, 1);
    Serial.print("C");
    Serial.print("SHT20  Humidity:");
    Serial.print(humd, 1);
    Serial.print("%");
    Serial.println();
    Serial.print("DHT22 Temperature:");
    Serial.print(dhtt, 1);
    Serial.print("C");
    Serial.print("DHT22  Humidity:");
    Serial.print(dhth, 1);
    Serial.print("%");
    Serial.println();
    client.stop();
  }
  delay(20000);
}

雖然還有一個設備沒接上，先用我的角蛙缸測試一下 ：

躲在土中的角蛙

養殖缸的底部用過濾網加高土，避免積水在土中

下方為土壤濕度計 SHT20 上方為環境溫濕度計 DHT22

數據顯示在Thinkspeak

看了 Thingspeak 數據之後，突然發現 SHT20 傳回的相對濕度超過 100%，看來又要除錯了。