[PD] Arduino, Pd and ultrasonics: HELP needed for degree project!
Ricardo Lameiro
ricardolameiro at gmail.com
Tue Sep 28 00:38:58 CEST 2010
I am just thinking out of my head,
maybe you could send via serial someting like
"IR "
and then the ir value, on the PD side you make a route [route IR FX XPTO]
It should rout the data
now i am not sure if it will work just with spaces separating them, or maybe
with CR, but if you have the hardware at hand, should be easy to test.
2010/9/27 Chris Jack <itsmrjack at gmail.com>
> Dear Pd'ers… I'm fairly new to Pd and have been using it during my 'Audio
> Production' degree. I'm here to ask for help on my final degree project,
> which aims to control objects within Pd by way of proximity sensors
> connected to Arduino.
>
> I have had moderate success, first using a Sharp GPD12 IR sensor connected
> to an analog port on an Arduino Diecimila, then a Devantech SRF02 connected
> via I2C to Arduino. I have managed to get Pure Data reading the sensor
> values using the Pure Data example included in SimpleMessageSystem (
> http://www.arduino.cc/playground/uploads/Code/SimpleMessageSystem.zip) ...
> and only altering the number of the comport the Arduino appears on.
>
> [image: SMS pic.jpg]
>
>
> On the Arduino end, I have added the SimpleMessageSystem library, and am
> using the following sketch to run one or both of the sensors depending on
> whether or not I omit the SRF02 or GPD12 parts of the code.
>
>
> // top //
>
> #include <Wire.h>
>
> #include <Servo.h>
>
> #include <SimpleMessageSystem.h>
>
>
> int sensorPin = 0;
>
> int sensorValue = 0;
>
> Servo servo1;
>
>
> #define sensorAddress 0x70
>
> #define readInches 0x50
>
> #define readCentimeters 0x51
>
> #define readMicroseconds 0x52
>
> #define resultRegister 0x02
>
>
> void setup()
>
> {
>
> Wire.begin();
>
> Serial.begin(9600);
>
> }
>
>
>
> void sendCommand (int address, int command) {
>
> Wire.beginTransmission(address);
>
> Wire.send(0x00);
>
> Wire.send(command);
>
> Wire.endTransmission();
>
> }
>
>
>
> void setRegister(int address, int thisRegister) {
>
> Wire.beginTransmission(address);
>
> Wire.send(thisRegister);
>
> Wire.endTransmission();
>
> }
>
> int readData(int address, int numBytes) {
>
>
>
> int result = 0;
>
>
>
> Wire.requestFrom(address, numBytes);
>
> while (Wire.available() < 2 );{
>
> }
>
>
>
> result = Wire.receive() * 256;
>
> result = result + Wire.receive();
>
> return result;
>
> }
>
>
> void loop()
>
> {
>
> // SRF02 READING //
>
> sendCommand(sensorAddress, readInches);
>
> delay(70);
>
> setRegister(sensorAddress, resultRegister);
>
> int sensorReading = readData(sensorAddress, 2);
>
> Serial.println(sensorReading);
>
>
> delay (200);
>
>
>
> // GPD12 READING //
>
> sensorValue = analogRead(sensorPin);
>
> int range = (6787 / sensorValue);
>
> Serial.println(range);
>
>
>
> delay(200);
>
> }
>
>
> // bottom //
>
>
> Pure data is picking up the sensor's output as a decimal number, through
> the serial port, correctly, and showing this as a number in the SPECIAL
> CHARACTER (note the '80' value in the Pd patch pic that my screen shot
> caught) section of the Pd patch, which I can then use to control various Pd
> parameters, like a slider for example.
>
> If printing both sensor readings to the serial, the Pd patch will pick up
> the two sensor values alternately, but there seems no way of differentiating
> the two sensors within Pd, as they both come through the serial. I have
> tried prepending the serial print at the Arduino stage with a tag such as
> "IR" or "UL" for each sensor, but this simply ends up in nothing coming
> through in Pd.
>
> Using one sensor gives the ability to control parameters with a fairly
> narrow detection range, but for the final version I would like to
> incorporate 4 or 5 sensors in order that I can cover nearly a full 360
> degree range.
>
> After a bit of research I have gone and bought 4 x Maxsonar EZ0's. They've
> got a wider range than the Devantech sensors, and can operate via I2C,
> serial or PWM. A number of people online seem to mention the improved
> stability when operating via PWM, so I thought this could be kinda useful.
>
> I am going to London Hackspace tomorrow to get help with wiring up the
> sensors to my Arduino Diecimila, but for now, my main problem seems to be
> how to achieve greater communication between Pure Data and the sensors. It's
> all very good and well being able to take the decimal readout from an analog
> input to give one set of values in Pd, but I would like to know how to
> either to read (and trigger) each sensor discretely via PWM, or to somehow
> differentiate between each sensor's analog output, so that I can have the
> different sensors controlling different objects within Pd.
>
> As well as SimpleMessageSystem, I looked at using the Pduino object. But to
> be honest, it is either not working properly (I have noticed reported issues
> with bugginess), or I am being stupid, as it has totally boggled my brain.
> In theory though, it seems like it should be able to do what I want, ie.
> send and receive commands between Arduino and Pd.
>
> So…. my questions for anyone out there with a knowledge of using Arduino +
> multiple sensors (preferably Maxsonar EZ's) with Pd are:
>
> What is most appropriate for my project?
>
> - Simple Message System or Pduino?
>
> - analog or PWM?
>
> And how do I get proper communication between the two platforms so I can
> discern discrete values from each sensor?
>
> I'd really like to get a discussion going with this as (a) it would really
> help me in my degree (which ends in about 4 weeks!!!) and (b) I really want
> to share what I am doing, especially as the discussions on Arduino/Pd
> communication on the various forums seem a little patchy (at least for noobs
> like me). I also hope to continue my research in the future, sharing any
> findings I make with the community…
>
>
> PS. In the sharing spirit, please check out the Radio Tuner patch I've just
> posted over at http://puredata.hurleur.com/sujet-4682-radio-tuner ...it's
> my first successful attempt at Pd... I hope you enjoy :)
>
> Many thanks
> --
> Mr Jack
>
> Discus Jockey
> Audio Tweeker
> Musical Protagonist
>
> itsmrjack at gmail.com
> http://soundcloud.com/mrjack
> http://www.myspace.com/itsmrjack
>
> http://earshaveeyes.blogspot.com
> http://campari0safari.wordpress.com
>
> _______________________________________________
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>
--
Fagote / Contrafagote
Bassoon / Contra-bassoon
http://myspace.com/ricardolameiro
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