Porting Arduino Sketch from Ethernet to Wifi

0
votes

I have a sketch working with an Arduino Uno and an Ethernet Shield - and it's working fine. Now I've gotten my hands on some Arduino Uno WiFi, and I want to port the sketch from ethernet to wifi - but I've run into a wall now. Most of the guide/FAQ/help I can find is for a WiFi Shield, and not a WiFi Arduino, so I'm stuck here.

Below is my (original Ethernet) code. I can post my somewhat modified Wifi code, but I can't even compile it without errors.

//  Hartmann fugtighedsmåler v 0.1
//  Lavet af Jan Andreasen
//  Skriver til DB på FDKTO517

#include <Ethernet.h>
#include <SPI.h>
#include <DHT.h>
#define DHTPIN 2 // Siger sig selv
#define DHTTYPE DHT11 // Typen af sensor. 

float h = 0;
float t = 0;
byte mac[] = {0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02}; // Macadresse på kortet
IPAddress server(10,16,9,229); // Server adressen på SQL'en

EthernetClient client;
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println("Starting...");
  Ethernet.begin(mac);
  dht.begin();
}

void loop() {
  readTempHum();
  delay(300000); // Loop timer i millis - 5 minutter
}

void get_request(float t, float h) {
  Serial.println("Connecting to Client...");
  if (client.connect(server, 10080)) {
    Serial.println("--> connection ok\n");
    client.print("GET /test.php?");
    // Placering af PHP script til upload til DB
    client.print("t="); // Temp
    client.print(t); 
    client.print("&h="); // Fugtighed
    client.print(h);
    client.println(" HTTP/1.1");
    client.print( "Host: " );
    client.println(server);
    client.println("Connection: close");
    client.println();
    client.println();
    client.stop();
    Serial.println("--> finished transmission\n");
  } else {
    Serial.println("--> connection failed\n");
  }
}

void readTempHum() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  {
    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print("%\t");
    Serial.print("Temperature:");
    Serial.print(t);
    Serial.println("*C");
    get_request(t,h);
  }
}

I've also posted this on the Arduino Forum. I'm sorry if you see my double-post, and I'll post the solution to my problem here as well.

New sketch:

#include <Wire.h>
#include <UnoWiFiDevEd.h>
#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT11

float h = 0;
float t = 0;

DHT dht(DHTPIN, DHTTYPE);

void setup() {

  const char* connector = "rest";
  const char* server = "10.16.9.229";
  const char* method = "GET";
  const char* resource = "/test.php?t=";

  Serial.begin(9600);
  Ciao.begin();
  dht.begin();

  pinMode(2, INPUT);

  delay(10000);
}

void loop() {

  readTempHum();
//  doRequest(connector, server, resource, method);
  delay(300000);
}

void doRequest(const char* conn, const char* server, const char* command, const char* method, float t, float h){
  CiaoData data = Ciao.write(conn, server, command, method);
}

void readTempHum() {
  h = dht.readHumidity();
  t = dht.readTemperature();
  const char* connector = "rest";
  const char* server = "10.16.9.229";
  const char* method = "GET";
  const char* resource = "/test.php?t=";

    {
    doRequest(connector, server, resource, method,t,h);
    }
  }

Now, I've ran into a new problem. The value from the sensor (t and h) are supposed to be output in the HTTP/GET command like this: test.php?t=1&h=2 But I can't seem to make that work. If I try to define the resource as this const char* resource = "/test.php?t="+t+"&h="+h; I get an error (obviously), but if I try to declare it as a string, I the same error again.

Error:

HumidSQL3_Wifi_master:24: error: invalid operands of types 'const char [13]' and 'float' to binary 'operator+'

const char* resource = "/test.php?t="+t+"&h="+h;

Now, I hope that some of you could help me out a bit here :/

2
arduinoarduino-unoarduino-uno-wifi
Are we are supposed to play a guessing game on what the compiler error says? And also waste our time, repeating whatever was already said on Arduino Forum? If you want answers, you need to make it easy for us. – gre_gor
Thank you for owning up to the cross-posting. It is generally not received well, because it can lead to a situation where someone does not know about other copies of the same question, and they expend a great effort on an answer, which essentially duplicates a pre-existing reply on another copy. At the very least, please add links to all of your cross-posts to all of the others, so that people can check on the other posts what answers have been made already. Would you make that edit? – halfer
@halfer Well, I'm not getting anywhere by not being honest. I know that some of you may be using both forums, but if X searches at Y and doesn't find the answer, well - nomatter what, I'll post the answer on the forum that didn't come up with it (with credit ofc) - does it make sense? Oh well - I edited the question with compiler error and the link to Arduino.cc forum. Although, I think that I'll start from scratch using Juraj's answer. – j.andreasen

2 Answers

1
votes

If it is the Arduino.org Arduino UNO WiFi Developer Edition, then use WiFi Link with UNO WiFi Serial1 library

0
votes

Okay - so I made it work. I had to start from scratch, and with the help from Juraj (I'll accept your answer as well) it works now.

Below are the final sketch ("final", as the DHT11 sensor only were for testing purpose, as a proof-of-concept)

//  Hartmann fugtighedsmåler v 0.2.2
//  Lavet af Jan Andreasen
//  Skriver til DB på FDKTO517
//  WiFi udgave, testversion


#include <Wire.h>
#include <UnoWiFiDevEd.h>
#include <DHT.h>
#define DHTPIN 4
#define DHTTYPE DHT11
#define CONNECTOR "rest"
#define SERVER_ADDR "10.16.9.229"


float h = 0;
float t = 0;

DHT dht(DHTPIN, DHTTYPE);

void setup() {

  Serial.begin(9600);
  Ciao.begin();
  dht.begin();

  pinMode(2, INPUT); // I'm not sure if this is required, just saw it now

  delay(10000); // A 10 second delay from start to initialization
}

void loop() {

  readTempHum();
  delay(300000); // A 5 minute delay between measurements
}

void readTempHum() {
  h = dht.readHumidity(); // Reads the humidity from sensor
  t = dht.readTemperature(); // Reads the temperature from sensor
  String uri = "/test.php?t="; // URL to the PHP-file
  uri += t;  // Insert the T-value
  uri +="&h=";
  uri += h; // Insert the H-value

  CiaoData data = Ciao.write(CONNECTOR, SERVER_ADDR, uri); // Make a basic HTTP request to the specified server using REST and the URL specified above
  }

Maybe not the prettiest code you've seen, however, it works now. Thanks for all your inputs :)