Jim Mueller
/
Nucleo_dht11_Webserver
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Dependencies: LCD_i2c_GSOE ESP8266WebserverGSOE
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main.cpp
00001 00002 //based on DHT11 Library of Jeng: https://os.mbed.com/users/JENG/code/Nucleo_dht11/ 00003 #include "mbed.h" 00004 #include "LCD.h" 00005 #include "ESP8266Webserver.h" 00006 00007 00008 #define DHTLIB_OK 0 00009 #define DHTLIB_ERROR_CHECKSUM -1 00010 #define DHTLIB_ERROR_TIMEOUT -2 00011 ESP8266Webserver myWebserver; 00012 Timer tmr; 00013 lcd mylcd; 00014 00015 DigitalInOut data_pin(PB_0); //Anschluss S (Data) 00016 //Anschluss - an GND 00017 //mittlerer Anschluss an 3,3V 00018 00019 int humidity; 00020 int temperature; 00021 00022 //######################################## 00023 // DHT11 Library 00024 //######################################## 00025 int dht_read(void){ 00026 00027 // BUFFER TO RECEIVE 00028 uint8_t bits[5]; 00029 uint8_t cnt = 7; 00030 uint8_t idx = 0; 00031 00032 tmr.stop(); 00033 tmr.reset(); 00034 00035 // EMPTY BUFFER 00036 for(int i=0; i< 5; i++) bits[i] = 0; 00037 00038 // REQUEST SAMPLE 00039 data_pin.output(); 00040 data_pin.write(0); 00041 wait_us(18000); 00042 data_pin.write(1); 00043 wait_us(40); 00044 data_pin.input(); 00045 00046 // ACKNOWLEDGE or TIMEOUT 00047 unsigned int loopCnt = 20000; 00048 00049 while(!data_pin.read())if(!loopCnt--)return DHTLIB_ERROR_TIMEOUT; 00050 00051 loopCnt = 20000; 00052 00053 while(data_pin.read())if(!loopCnt--)return DHTLIB_ERROR_TIMEOUT; 00054 00055 // READ OUTPUT - 40 BITS => 5 BYTES or TIMEOUT 00056 for(int i=0; i<40; i++){ 00057 00058 loopCnt = 20000; 00059 00060 while(!data_pin.read())if(loopCnt-- == 0)return DHTLIB_ERROR_TIMEOUT; 00061 00062 //unsigned long t = micros(); 00063 tmr.start(); 00064 00065 loopCnt = 20000; 00066 00067 while(data_pin.read())if(!loopCnt--)return DHTLIB_ERROR_TIMEOUT; 00068 00069 if(tmr.read_us() > 40) bits[idx] |= (1 << cnt); 00070 00071 tmr.stop(); 00072 tmr.reset(); 00073 00074 if(cnt == 0){ // next byte? 00075 00076 cnt = 7; // restart at MSB 00077 idx++; // next byte! 00078 00079 }else cnt--; 00080 00081 } 00082 00083 // WRITE TO RIGHT VARS 00084 // as bits[1] and bits[3] are allways zero they are omitted in formulas. 00085 humidity = bits[0]; 00086 temperature = bits[2]; 00087 00088 uint8_t sum = bits[0] + bits[2]; 00089 00090 if(bits[4] != sum)return DHTLIB_ERROR_CHECKSUM; 00091 00092 return DHTLIB_OK; 00093 00094 } 00095 00096 char buffer[17]; 00097 00098 //######################################## 00099 // End of DHT11 Library 00100 //######################################## 00101 float poti=0.5; 00102 string getRootPage() 00103 { 00104 string webpage; 00105 webpage="<!DOCTYPE html>"; 00106 //Javascript 00107 webpage+="<script type=\"text/javascript\">"; 00108 webpage+="var x;"; 00109 webpage+="function z(){location.assign(\"http://"; 00110 webpage+=myWebserver.gibIP(); 00111 webpage+="\");}"; 00112 webpage+="function sT(){x=setInterval(z,1000);}"; 00113 webpage+="function spT(){clearInterval(x);}"; 00114 webpage+="onload=sT();"; 00115 webpage+="</script>\n"; 00116 //HTML 00117 webpage+="<html>"; 00118 webpage+="<head>"; 00119 webpage+="<title>STM32 HTTP</title>"; 00120 webpage+="</head>"; 00121 webpage+="<body>"; 00122 webpage+="<h1>WIFI mit STM32 ESP01</h1>\n"; 00123 webpage+="<p>Tmp:"+to_string(temperature)+" C</p>\n"; 00124 webpage+="<p>Hum:"+to_string(humidity)+"%</p>\n"; 00125 webpage+="</body>"; 00126 webpage+="</html>"; 00127 return webpage; 00128 } 00129 00130 00131 void testfunc() 00132 { 00133 myWebserver.send(200,"text/html",getRootPage()); 00134 } 00135 00136 00137 int main(void){ 00138 myWebserver.on("/",&testfunc); 00139 myWebserver.begin(); 00140 mylcd.clear(); 00141 mylcd.cursorpos(0); 00142 00143 mylcd.printf("Nucleo - DHT11"); 00144 00145 for(;;){ 00146 myWebserver.handleClient(); 00147 int fehler=dht_read(); 00148 00149 00150 00151 mylcd.cursorpos(0x40); 00152 mylcd.printf("Hum %2d%% Tmp %2dc ", humidity, temperature); 00153 wait_us(500000); 00154 00155 00156 00157 } 00158 00159 }
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