sensor_http_post

Published 25 Apr 2010, by sho hashimoto
adc, http
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main.cpp

00001 #include "mbed.h"
00002 #include "HTTPClient.h"
00003 #include <string>
00004 using namespace std;
00005 
00006 Serial pc(USBTX, USBRX);
00007 
00008 DigitalOut led1(LED1); // blink
00009 DigitalOut led2(LED2); // blink when http-post
00010 DigitalOut led3(p11); // represent ADC value
00011 
00012 AnalogIn adc(p15);
00013 float ain;
00014 
00015 HTTPClient http; // use DHCP
00016 
00017 const string api_uri = "http://shokai.mag.keio.ac.jp/sensor-storage/shokai/cds/";
00018 const string mbed_name = "shokai-mbed01";
00019 const string sensor_name = "CdS";
00020 
00021 void blink_led(DigitalOut led, int num){
00022     for(int i=0; i < num*2; i++){
00023         led = !led;
00024         wait(0.1);
00025     }
00026 }
00027 
00028 void post_sensor_value(){
00029     blink_led(led2, 2);
00030     char query[256] = "";
00031     char result[4096] = ""; // 4kb
00032     sprintf(query, "name=%s&%s=%f", mbed_name.c_str(), sensor_name.c_str(), (float)ain);
00033     pc.printf("post:%s => %s\n", query, api_uri.c_str());
00034     http.post(api_uri.c_str(), query, result, 4096);
00035     pc.printf("%s\n", result);
00036     blink_led(led2, 2);
00037 }
00038 
00039 int main(void){
00040     led1 = 1;
00041     int count = 0;
00042     while(1) {
00043         ain = adc;
00044         pc.printf("sensor:%f\n", float(ain));
00045         led1 = !led1; // blink LED
00046         if(ain > 0.1) led3 = 0; // represent CdS value
00047         else led3 = 1;
00048         if(count > 20){
00049             post_sensor_value();
00050             count = 0;
00051         }
00052         count++;
00053         wait(0.5);
00054     }
00055 }