DATALOGGING
DATALOGGING EXCERISE: FROM ARDUINO-PROCESSING-PHP-TXT
Using Export was taking a really long time to figure out. Including ordering the attachable board etc. But I really wanted to do this assignment since eventually I would really love to use a datalogging feature in most of my electronic devices.
I decided to use the option to have Processing read a PHP file on the server to create a text file. At first I used a potentiometer and then I used the Ultrasonic Movement Detector, not from Parallax but very similar. It took some changes on the Arduino code side:
/* Ultrasound Sensor
* -----------------
*
* Reads values (00014-01199) from an ultrasound sensor (3m sensor)
* and writes the values to the serialport. The sensor is the
* so-called PING sensor from Parallax/Devantech.
*
* http://www.xlab.se | http://www.0j0.org
* copyleft 2005 Mackie for XLAB | DojoDave for DojoCorp
*
*/
int ultraSoundSignalout = 8; // Ultrasound signal out pin
int ultraSoundSignalin = 7; // Ultrasound signal in pin
int val = 0;
int ultrasoundValue = 0;
int timecount = 0; // Echo counter
int firstSensor = 0; // first digital sensor
int inByte = 0; // incoming serial byte
byte firstSensorLSB; //LSB for the analog sensor value
byte firstSensorMSB; //MSB for the analog sensor value
void setup()
{
// start serial port at 9600 bps:
Serial.begin(9600);
}
void loop()
{
timecount = 0;
val = 0;
pinMode(ultraSoundSignalout, OUTPUT); // Switch signalpin out to output
/* Send low-high-low pulse to activate the trigger pulse of the sensor
* -------------------------------------------------------------------
*/
digitalWrite(ultraSoundSignalout, LOW); // Send low pulse
delayMicroseconds(2); // Wait for 2 microseconds
digitalWrite(ultraSoundSignalout, HIGH); // Send high pulse
delayMicroseconds(5); // Wait for 5 microseconds
digitalWrite(ultraSoundSignalout, LOW); // Holdoff
/* Listening for echo pulse
* -------------------------------------------------------------------
*/
pinMode(ultraSoundSignalin, INPUT); // Switch signalpin in to input
val = digitalRead(ultraSoundSignalin); // Append signal value to val
while(val == LOW) { // Loop until pin reads a high value
val = digitalRead(ultraSoundSignalin);
}
while(val == HIGH) { // Loop until pin reads a high value
val = digitalRead(ultraSoundSignalin);
timecount = timecount +1; // Count echo pulse time
}
/* Writing out values to the serial port
* -------------------------------------------------------------------
*/
ultrasoundValue = timecount/2; // Append echo pulse time to ultrasoundValue
//Serial.print('A'); // Example identifier for the sensor
//Serial.println(ultrasoundValue);
//Serial.println();
/* Lite up LED if any value is passed by the echo pulse
* -------------------------------------------------------------------
*/
//if(timecount > 0){
//digitalWrite(ledPin, HIGH);
//}
/* Delay of program
* -------------------------------------------------------------------
*/
delay(100);
// if we get a valid byte, read analog ins:
if (Serial.available() > 0) {
// get incoming byte:
inByte = Serial.read();
if (inByte == 65) //i.e.: it's an ASCII "A"
{
firstSensor = ultrasoundValue;
firstSensorLSB = firstSensor;
firstSensorMSB = firstSensor >> 8;
Serial.print(firstSensorLSB, BYTE);
Serial.print(firstSensorMSB, BYTE);
}
}
}
While the Processing and PHP code stayed the same.
At first the location of the files wasn't correct.
But then it worked!!!
Et Voila'!
The datalog file is located at:
http://itp.nyu.edu/~bp432/sensors/datalog.txt