Ciao a tutti ho riadattato il codice di un esempio, lo scopo è quello di mettere in una pagina html il valore della temperatura letta da un DS18B20, sulla seriale il valore letto è perfetto, tramite web da un valore tipo 32569. Come modulo la utilizzo questo
https://i.ytimg.com/vi/sY1WJ78l8N8/maxresdefault.jpg
Penso che l’errore sia solo di codifica
#include <EtherCard.h>
#include <OneWire.h>
//START region Ethernet config
#define STATIC 1 // set to 1 to disable DHCP (adjust myip/gwip values below)
#if STATIC
// ethernet interface ip address
static byte myip[] = { 192,168,1,10 };
// gateway ip address
static byte gwip[] = { 192,168,1,1 };
#endif
static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };
byte Ethernet::buffer[700];
const int ledPin = 2;
boolean ledStatus;
char* on = "ON";
char* off = "OFF";
char* statusLabel;
char* buttonLabel;
//END region Ethernet config
//START region temperature sensor config
OneWire ds(4);
double temperature = 10.10;
//END region temperature sensor config
void setup () {
Serial.begin(57600);
Serial.println("Termostato web");
if (ether.begin(sizeof Ethernet::buffer, mymac) == 0)
Serial.println( "Impossibile accedere al controller ethernet");
#if STATIC
ether.staticSetup(myip, gwip);
#else
if (!ether.dhcpSetup())
Serial.println("DHCP fallito");
#endif
ether.printIp("IP: ", ether.myip);
ether.printIp("GW: ", ether.gwip);
ether.printIp("DNS: ", ether.dnsip);
Serial.println();
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
ledStatus = false;
}
void loop() {
temperature = getTemp();
Serial.println(temperature);
word len = ether.packetReceive();
word pos = ether.packetLoop(len);
if(pos) {
if(strstr((char *)Ethernet::buffer + pos, "GET /?status=ON") != 0) {
Serial.println("Received ON command");
ledStatus = true;
}
if(strstr((char *)Ethernet::buffer + pos, "GET /?status=OFF") != 0) {
Serial.println("Received OFF command");
ledStatus = false;
}
if(ledStatus) {
digitalWrite(ledPin, HIGH);
statusLabel = on;
buttonLabel = off;
} else {
digitalWrite(ledPin, LOW);
statusLabel = off;
buttonLabel = on;
}
//
// BufferFiller bfill = ether.tcpOffset();
// bfill.emit_p(PSTR("HTTP/1.0 200 OK\r\n"
// "Content-Type: text/html\r\nPragma: no-cache\r\n\r\n"
// "<html><head><title>WebLed</title></head>"
// "<body>LED Status: $S "
// "<a href=\"/?status=$S\"><input type=\"button\" value=\"$S\"></a>"
// "</body></html>"
// ), statusLabel, buttonLabel, buttonLabel);
// ether.httpServerReply(bfill.position());
BufferFiller bfill = ether.tcpOffset();
bfill.emit_p(PSTR("HTTP/1.0 200 OK\r\n"
"Content-Type: text/html\r\nPragma: no-cache\r\n\r\n"
"<!DOCTYPE html><html xmlns=http://www.w3.org/1999/xhtml>"
"<head>"
"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />"
"<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\" />"
"<title></title>"
"<style>html,body{height:100%}body{text-align:center;font-size:30px}div,input{width:100%;min-height:10%}input[type=button]{height:40px}</style>"
"</head><body>"
"<h2>Termostato WEB</h2>"));
bfill.emit_p(PSTR("<div>Temperatura</div><div><b>"));
bfill.emit_raw(PSTR("$D.0"),temperature);
bfill.emit_p(PSTR(" °C</b></div>"));
bfill.emit_p(PSTR("<div>Stato caldaia</div><div>$S</div>"
"<div><a href=\"/?status=$S\"><input type=\"button\" value=\"$S\"></a></div>"
"</body></html>"
), statusLabel, buttonLabel, buttonLabel);
ether.httpServerReply(bfill.position());
}
}
float getTemp(){
//returns the temperature from one DS18B20 in DEG Celsius
byte data[12];
byte addr[8];
if ( !ds.search(addr)) {
//no more sensors on chain, reset search
ds.reset_search();
return -1000;
}
if ( OneWire::crc8( addr, 7) != addr[7]) {
Serial.println("CRC is not valid!");
return -1000;
}
if ( addr[0] != 0x10 && addr[0] != 0x28) {
Serial.print("Device is not recognized");
return -1000;
}
ds.reset();
ds.select(addr);
ds.write(0x44,1); // start conversion, with parasite power on at the end
byte present = ds.reset();
ds.select(addr);
ds.write(0xBE); // Read Scratchpad
for (int i = 0; i < 9; i++) { // we need 9 bytes
data[i] = ds.read();
}
ds.reset_search();
byte MSB = data[1];
byte LSB = data[0];
float tempRead = ((MSB << 8) | LSB); //using two's compliment
float TemperatureSum = tempRead / 16;
return TemperatureSum;
}