Hello everyone,
So i wanted to show some values of my tow Sensirion sensors (SHT75) to a web server.
I made a simple programme to try it and for only one sensor there is no problem( the web server work and i can see all the values of my sensor in the serial com).
However for two sensors my web server didn't work and i can only see the value of the first sensor...
It is displayed for the second sensor sometimes "Error: -3 - CRC mismatch!" and often "Error: -4 - Measurement timeout!" on the serial com.
Of course all my sensors are functional because without the web server everything work.
I need your help please !
My code is below(and i use the 3.01 Sensirion Library):
// Variables for the server :
#include <SPI.h>
#include <Ethernet.h>
// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 166, 70); // IP address, may need to change depending on network
EthernetServer server(80); // create a server at port 80
//----------------------------------------------------------------------------------------
#include <Sensirion.h>
#define LED 13
long mtime;
// Sensirion(dataPin, sclkPin, address, noholdmaster);
// SHT1x address = 0x00 SHT2x address = 0x40 SHT3x address = 0x44 or 0x45
Sensirion sht1 = Sensirion(9, 8);
Sensirion sht2 = Sensirion(11, 10);
//Variables for the first sensor
float temperature;
float humidity;
float dewpoint;
float humidity37oC;
int ret, mret=1234;
//Variables for the second sensor
float temperature2;
float humidity2;
float dewpoint2;
float humidity37oC2;
int ret2, msret=1234;
void setup()
{
pinMode(LED, OUTPUT); // initialize digital pin LED as an output
Serial.begin(115200); //initialize Serial
Ethernet.begin(mac, ip); // initialize Ethernet device
server.begin(); // start to listen for clients
}
void loop()
{
digitalWrite(LED,(((millis()>>6)&0x5)==0)); // double flash led rapidly
// all parameters are optionals if user don't need it
logError (ret = sht1.measure(&temperature, &humidity, &dewpoint, 37, &humidity37oC)); // Measurement for the first sensor
logError (ret2 = sht2.measure(&temperature2, &humidity2, &dewpoint2, 37, &humidity37oC2)); // Measurement for the second sensor
//---------------------------------------------------------------------------
//part of the first sensor
if (ret != mret) // only for debug purpose
{
Serial.print("(");
Serial.print(millis()-mtime);
mtime=millis();
Serial.print("mS) ");
if(ret==0)
{
Serial.println();
Serial.println();
}
Serial.print("[");
Serial.print(ret);
Serial.print("] ");
}
if (ret == S_Meas_Rdy) // A new measurement is available
{
Serial.println();
Serial.print("Temperature = ");
Serial.print(temperature);
Serial.print(" oC, Humidity = ");
Serial.print(humidity);
Serial.print(" %, Dewpoint = ");
Serial.print(dewpoint);
Serial.print(" oC, Humidity @37oC = ");
Serial.print(humidity37oC);
Serial.print(" % ");
}
//---------------------------------------------------------------------------
//part of the second sensor
if (ret2 != msret) // only for debug purpose
{
Serial.print("(");
Serial.print(millis()-mtime);
mtime=millis();
Serial.print("mS) ");
if(ret2==0)
{
Serial.println();
Serial.println();
}
Serial.print("[");
Serial.print(ret2);
Serial.print("] ");
}
if (ret2 == S_Meas_Rdy) // A new measurement is available
{
Serial.println();
Serial.print("Temperature2 = ");
Serial.print(temperature2);
Serial.print(" oC, Humidity2 = ");
Serial.print(humidity2);
Serial.print(" %, Dewpoint2 = ");
Serial.print(dewpoint2);
Serial.print(" oC, Humidity @37oC2 = ");
Serial.print(humidity37oC2);
Serial.print(" % ");
}
//------------------------------------------------------------------------------
msret = ret2;
mret = ret;
//----------------------------------------------------------------------------------------
// Server part:
EthernetClient client = server.available(); // try to get client
if (client) { // got client?
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) { // client data available to read
char c = client.read(); // read 1 byte (character) from client
// last line of client request is blank and ends with \n
// respond to client only after last line received
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
client.println();
// send web page
client.println("<!DOCTYPE html>");
client.println("<html>");
client.println("<head>");
client.println("<title>Arduino Web Page</title>");
client.println("</head>");
client.println("<body>");
client.println("<h1>Hello from Arduino!</h1>");
client.println("<p>A web page from the Arduino server</p>");
client.println("</body>");
client.println("</html>");
break;
}
// every line of text received from the client ends with \r\n
if (c == '\n') {
// last character on line of received text
// starting new line with next character read
currentLineIsBlank = true;
}
else if (c != '\r') {
// a text character was received from client
currentLineIsBlank = false;
}
} // end if (client.available())
} // end while (client.connected())
delay(1); // give the web browser time to receive the data
client.stop(); // close the connection
} // end if (client)
// listen for incoming clients
//-------------------------------------------------------------------------------------------------
}
// The following code is only used with error checking enabled
void logError(int error)
{
if (error>=0) // No error
return;
Serial.println();
Serial.print("Error: ");
Serial.print(error);
switch (error)
{
case S_Err_Param:
Serial.print(" - Parameter error in function call! ");
break;
case S_Err_NoACK:
Serial.print(" - No response (ACK) from sensor! ");
break;
case S_Err_CRC:
Serial.print(" - CRC mismatch! ");
break;
case S_Err_TO:
Serial.print(" - Measurement timeout! ");
break;
default:
Serial.print(" - Unknown error received! ");
break;
}
}
!