作者：wony366 | 更新時間：2016-04-07 | 瀏覽量：2855
基本接線：
BMP180 esp8266
vcc 3.3V
gnd gnd
scl GPIO14
sda GPIO2
ESP8266通過TTL 接電腦，不再贅述。
以下是代碼：
#include <ESP8266WiFi.h>
#include <SFE_BMP180.h>
#include <Wire.h>
WiFiClient client;
const char *ssid = "xxx";//這里是我的wifi，你使用時修改為你要連接的wifi ssid
const char *password = "xxxx";//你要連接的wifi密碼
const char *host = "121.42.180.30";//貝殼云地址
char valueread;
SFE_BMP180 pressure;// 創建一個氣壓計對象
double baseline; // 基準氣壓
void setup()
{
Serial.begin(115200);
Wire.begin(2,14); //定義I2C接口，并啟動，ESP8266-12E的 2 和 14 口是原本定義為I2C接口，其他模塊查看手冊，用于讀取BMP180的參數
//下面的代碼是確保WIFI連接正確，并打印登錄路由器信息
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
//下面的代碼是連接服務器
const int httpPort =8181;
client.connect(host, httpPort);
delay(2000);
Serial.println("connecting to host");
while (!client.connect(host, httpPort))
{
Serial.println("..");
delay(500);
}
Serial.print("connecting to ");
Serial.println(host);
//下面的代碼是用自己的ID 和 KEY 登錄服務器，確保服務器返回正確登錄信息，否則一直重試登錄，直到出現正確的返回信息
client.write("{\"M\":\"checkin\",\"ID\":\"138\",\"K\":\"123456\"}\r\n");//登陸設備，修改成自己的ID和key
Serial.print("waitting for host answer");
delay(500);
String line = client.readStringUntil('\r');
Serial.print(line);
valueread=line[28];//修改自己成發送的指令的位置，我這里指令位置在是28位，此方法是參考前面網友的
Serial.println(valueread);//此處打印的是歡迎信息，并不代表登錄成功
while(valueread !='M') // 此處是驗證登錄成功后返回的信息
{
delay(500);
client.write("{\"M\":\"checkin\",\"ID\":\"138\",\"K\":\"123456\"}\r\n");//登陸設備，修改成自己的ID和key
Serial.print(".");
String line = client.readStringUntil('\r');
Serial.print(line);
valueread=line[2];//此處打印的是登錄成功信息，checkinok ,這是返回字段，我偷懶，隨便取了一位值，你可以按需取
Serial.println(valueread);
}
delay(100);
//下面是傳感器相關，無關云平臺
// 初始化傳感器
if (pressure.begin())
Serial.println("BMP180 init success");
else
{
// 糟糕，氣壓計出問題了，多半是連線有問題
Serial.println("BMP180 init fail (disconnected?)\n\n");
while(1); // 暫停
}
}
void loop()
{
baseline = getP(); //獲得基準氣壓
Serial.print("baseline pressure: ");
Serial.print(baseline);
Serial.println(" hPa");
double a,p,t;
p = getP();// 獲得一個氣壓值
a = pressure.altitude(p,baseline);//獲得基于基準氣壓的高度值
Serial.print("relative altitude: ");
if (a >= 0.0) Serial.print(" "); // 調整正數顯示格式
Serial.print(a,1);
Serial.print(" meters ");
t = getT();// 獲得一個溫度值
Serial.print("temperature: ");
Serial.print(t,1);
Serial.print(t);
Serial.println(" degrees");
update1(138,119,166,167,p,t,a);//向服務器發數據，138是設備ID，119 166 167 是數據接口，p t a 是傳感器參數
delay(5000);//刷新率5秒，太快，服務器會出錯
client.write("{\"M\":\"say\",\"ID\":\"138\",\"C\":\"123456\"}\r\n"); //保持心跳,這是我的ID 和key,自己修改 ，以防掉線
}
//取得BMP180氣壓的函數
double getP()
{
char status;
double T,P,p0,a;
// You must first get a temperature measurement to perform a pressure reading.
// Start a temperature measurement:
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = pressure.startTemperature();
if (status != 0)
{
// Wait for the measurement to complete:
delay(status);
// Retrieve the completed temperature measurement:
// Note that the measurement is stored in the variable T.
// Use '&T' to provide the address of T to the function.
// Function returns 1 if successful, 0 if failure.
status = pressure.getTemperature(T);
if (status != 0)
{
// Start a pressure measurement:
// The parameter is the oversampling setting, from 0 to 3 (highest res, longest wait).
// If request is successful, the number of ms to wait is returned.
// If request is unsuccessful, 0 is returned.
status = pressure.startPressure(3);
if (status != 0)
{
// Wait for the measurement to complete:
delay(status);
// Retrieve the completed pressure measurement:
// Note that the measurement is stored in the variable P.
// Use '&P' to provide the address of P.
// Note also that the function requires the previous temperature measurement (T).
// (If temperature is stable, you can do one temperature measurement for a number of pressure measurements.)
// Function returns 1 if successful, 0 if failure.
status = pressure.getPressure(P,T);
if (status != 0)
{
return P;
}
else Serial.println("error retrieving pressure measurement\n");
}
else Serial.println("error starting pressure measurement\n");
}
else Serial.println("error retrieving temperature measurement\n");
}
else Serial.println("error starting temperature measurement\n");
}
//取得BMP180溫度的函數
double getT()
{
char status;
double T,p0;
status = pressure.startTemperature();
if (status != 0)
{
delay(status);
status = pressure.getTemperature(T);
if (status != 0)
{
status = pressure.startPressure(3);
return T;
}
else Serial.println("error retrieving temperature measurement\n");
}
else Serial.println("error starting temperature measurement\n");
}
void update1(int did, int inputid1, int inputid2,int inputid3,float value1 ,float value2,float value3) // 定義一次傳遞3個參數的函數，該函數是借鑒 網友 在路上 的勞動成果
{
String str1="{\"M\":\"update\",\"ID\":\"";
str1+=did;
str1+="\",\"V\":{\"";
str1+=inputid1;
str1+="\":\"";
str1+=value1;
str1+="\",\"" ;
str1+=inputid2;
str1+="\":\"";
str1+=value2;
str1+="\",\"" ;
str1+=inputid3;
str1+="\":\"";
str1+=value3;
str1+="\"" ;
str1+="}}\n";
client.print(str1);
//下面是串口打印 傳遞到服務器的信息，以便調試
Serial.print("update:");
Serial.print(inputid1);
Serial.print("->");
Serial.println(value1);
Serial.print("update:");
Serial.print(inputid2);
Serial.print("->");
Serial.println(value2);
Serial.print("update:");
Serial.print(inputid3);
Serial.print("->");
Serial.println(value3);
}
數據見公開頁面 ：http://www.eqytg.org/chart/138.html