Non riesco a capire:
ho testato uno sketch di esempio che si collega al wifi, si collega a mysql e inserisce righe in una tabella.
Se lo eseguo con la board collegata al pc, l’IDE aperto e il monitor seriale aperto, tutto funziona correttamente: da phpMyAdmin vedo che le righe aumentano sul db ogni 2 secondi, come previsto.
Se lo scollego dal pc e lo alimento in modo autonomo, non funziona. Non si collega al wifi e non fa insert sul DB.
Dove sto sbagliando?
/*
MySQL Connector/Arduino Example : basic insert
This example demonstrates how to issue an INSERT query to store data in a
table. For this, we will create a special database and table for testing.
The following are the SQL commands you will need to run in order to setup
your database for running this sketch.
CREATE DATABASE test_arduino;
CREATE TABLE test_arduino.hello_arduino (
num integer primary key auto_increment,
message char(40),
recorded timestamp
);
Here we see one database and a table with three fields; a primary key that
is an auto_increment, a string, and a timestamp. This will demonstrate how
to save a date and time of when the row was inserted, which can help you
determine when data was recorded or updated.
INSTRUCTIONS FOR USE
1) Create the database and table as shown above.
2) Change the address of the server to the IP address of the MySQL server
3) Change the user and password to a valid MySQL user and password
4) Connect a USB cable to your Arduino
5) Select the correct board and port
6) Compile and upload the sketch to your Arduino
7) Once uploaded, open Serial Monitor (use 115200 speed) and observe
8) After the sketch has run for some time, open a mysql client and issue
the command: "SELECT * FROM test_arduino.hello_arduino" to see the data
recorded. Note the field values and how the database handles both the
auto_increment and timestamp fields for us. You can clear the data with
"DELETE FROM test_arduino.hello_arduino".
Note: The MAC address can be anything so long as it is unique on your network.
Created by: Dr. Charles A. Bell
*/
#include <MySQL_Connection.h>
#include <MySQL_Cursor.h>
#include <WiFi101.h>
#include <SPI.h>
byte mac_addr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server_addr(192, 168, 0, 100); // IP of the MySQL *server* here
char user[] = "****"; // MySQL user login username
char password[] = "***"; // MySQL user login password
// Sample query
char INSERT_SQL[] = "INSERT INTO test_arduino.hello_arduino (message) VALUES ('Hello, Arduino!')";
char ssid[] = "*****"; // your SSID
// WiFi card example
char pass[] = "*****"; // your SSID Password
WiFiClient client;
MySQL_Connection conn((Client *)&client);
void setup() {
Serial.begin(115200);
while (!Serial); // wait for serial port to connect
// Begin WiFi section
int status = WiFi.begin(ssid, pass);
if ( status != WL_CONNECTED) {
Serial.println("Couldn't get a wifi connection");
while (true);
}
// print out info about the connection:
else {
Serial.println("Connected to network");
IPAddress ip = WiFi.localIP();
Serial.print("My IP address is: ");
Serial.println(ip);
}
// End WiFi section
// Ethernet.begin(mac_addr);
Serial.println("Connecting...");
if (conn.connect(server_addr, 3307, user, password)) {
delay(1000);
}
else
Serial.println("Connection failed.");
}
void loop() {
delay(2000);
Serial.println("Recording data.");
// Initiate the query class instance
MySQL_Cursor *cur_mem = new MySQL_Cursor(&conn);
// Execute the query
cur_mem->execute(INSERT_SQL);
// Note: since there are no results, we do not need to read any data
// Deleting the cursor also frees up memory used
delete cur_mem;
}
