PhpMyAdmin table gives empty column - php

Question

I am working on a project to send sensor data to phpmyadmin table using GET request.
I am not able to see sensor data in the table when I consider my Arduino to be the client, but when I use this URL on my Google chrome browser it shows the result (ex. 40).
It seems the problem is with the Arduino code.
int samples[NUMSAMPLES];
void loop() {
// Thermistor
uint8_t i;
float average;
// take N samples in a row, with a slight delay
for (i=0; i< NUMSAMPLES; i++) {
samples[i] = analogRead(THERMISTORPIN);
delay(10);
}
// average all the samples out
average = 0;
for (i=0; i< NUMSAMPLES; i++) {
average += samples[i];
}
average /= NUMSAMPLES;
// convert the value to resistance
average = 1023 / average - 1;
average = SERIESRESISTOR / average;
float Steinhart;
Steinhart = average / THERMISTORNOMINAL; // (R/Ro)
Steinhart = log(Steinhart); // ln(R/Ro)
Steinhart /= BCOEFFICIENT; // 1/B * ln(R/Ro)
Steinhart += 1.0 / (TEMPERATURENOMINAL + 273.15); // + (1/To)
Steinhart = 1.0 / Steinhart; // Invert
Steinhart -= 273.15; // convert to C
Serial.print("Temperature ");
Serial.print(Steinhart);
Serial.println(" *C");
delay(5000);
Serial.println("\nStarting connection to server...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected to server");
// Make a HTTP request:
client.println("GET /add.php?");
client.print("Steinhart=");
client.print(Steinhart);
}
// if there are incoming bytes available
// from the server, read them and print them:
while (client.available()) {
char c = client.read();
Serial.write(c);
}
}
void setup() {
//Initialize serial and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// check for the presence of the shield:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue:
while(true);
}
// attempt to connect to Wifi network:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network. Change this line if using open or WEP network:
status = WiFi.begin(ssid);
// wait 10 seconds for connection:
delay(10000);
}
Serial.println("Connected to wifi");
printWifiStatus();
} // end of void setup()
And here is my PHP code: add.php file
<?php
include("connect.php");
$link=Connection();
$Steinhart = ""; // or null !!
$timeStamp="";
$Steinhart = isset($_GET['Steinhart']) ? $_GET['Steinhart'] : '';
date_default_timezone_set("Asia/Dubai");
$timeStamp = date('Y-m-d H:i:s', time());
$query= "INSERT INTO `time` (`id`, `timeStamp`, `Steinhart`) VALUES (NULL, '$timeStamp','$Steinhart')";
mysqli_query($link, $query);
mysqli_close($link);
?>

Answer 1

I Usually send data from the Arduino board to PhpmyAdmin(Wamp Server or XXamp) with the help of NodeJS. It is pretty easy to send data with the help of NodeJS.
Here i attach the code.
var request = require('request');
var serialport = require("serialport");
var SerialPort = serialport.SerialPort;
var serialPort = new SerialPort("COM5", {
baudrate: 9600,
parser: serialport.parsers.readline("\n")
});
serialPort.on("open", function () {
console.log('open');
serialPort.on('data', function(data) {
console.log(data);
});
});
serialPort.on('data', sendSerialData);
function sendSerialData(data) {
request({
uri: "http://127.0.0.1/write_data.php?value="+data,
method: "GET",
timeout: 10000,
followRedirect: true,
maxRedirects: 10
}, function(error, response, body) {
console.log(body);
});
}
By this you can easily send the data. Also you can just follow this link
http://www.instructables.com/id/PART-1-Send-Arduino-data-to-the-Web-PHP-MySQL-D3js/
Hope it will help