I have recently bought an arduino to use with PD and I am reletively new to both!
So im struggling with the code for the arduino and how to connect it with PD.

Is anyone able to help?

This is what I am tring to do.

I want and infrared beam to be set up using the arduino so that when the beam is constant and intact there is no signal going to PD however when the beam is broken I want it to trigger a bang in PD setting off the patch I have designed. The patch when triggered plays a series of midi notes in reason. After a delay that I have set at 10 seconds (this can be changed) the patch turns itself off.

SO I want the patch to play the music even though the beam reconnects and then stop after the set time ready for the next time it is broken.

Alternativly i want the beam to reconnect at a set amount of time (say 10 seconds) so that it cant be triggered again untill after the music stops.

Is there anyone doing something similar that can help me out with the arduino code. I dont really understand it properly yet.

This is how far I have got with the arduino code but im not sure if it is right or what I have to do to get the signal to PD.

int ledPin = 13;
int IRpin = 2;
char Patch[] = //i am stuck at this point
void setup()
{
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH);
pinMode(IRpin, INPUT);

}

void loop()
{
if(digitalRead(IRpin))
{
digitalWrite(ledPin, HIGH);
Serial.print(Patch);
}
else
digitalWrite(ledpin, LOW);

}

Thanks in advance

Tim

Hans' Pduino contains firmware for the Arduino which does in fact do all the hard work. You would simply need to connect your photodetector, and the coding could all be done in pd.

http://at.or.at/hans/pd/objects.html

Thanks

Ill check that out

CHeers
Tim

Hi

Thanks thats a real help.

Just one problem. Im having trouble makeing the arduino work with the patch in PD

Im using the arduino-test patch and I have selected the serial port that is the correct one for my arduino (port 2) and it is opening it but it has a message that says

*Warning* The baud rate 1089216512 is not suported or out of range, using 9600

Any ideas what this means and how to solve it.

Im not sure if im doing something wrong or I have to change some settings.

Thanks again for your help

Tim

*Warning* The baud rate 1089216512 is not suported or out of range, using 9600

The baud rate that is in your arduino code must be the same as the baud rate in your arduino PD patch.
One hint: the baud rate in the arduino-test patch is 57600, this must be the same in the code of your arduino board, otherwise it won*t work porperly. You can see that opening [arduino 1].

Marko

AHH okay!

I see, so if I get this message

*Warning* The baud rate 1104165643 is not suported or out of range, using 9600

would I change the baud rate in PD to say 1104165643, or would the code need changing.

If it is in the code, could you point out where it is that I need to change things. Im still getting messages saying its not working.

Im using the Standard Firmata 334 with a Arduino Diecimila. My PD version is PD extended test 4. If any of this effects it.

Thanks for your help.

Tim

I think I found where the Baud rate is set in the arduino code but it is already at 57600.

Also If I change it in PD, the number in the error message changes. It changes every time I change the rate in PD.

Any Ideas?

Thanks

Did you burn the Pduino (Firmata) firmware on there? It's needed to make the arduino pd patch work. After that, you can just send commands to it, instead of writing your code to the arduino. It's a serial interface for PD. It already has the baud set correctly.

To install it, copy the "Firmata" dir (inside Firmata-2.0beta in Pduino distro) to arduino/hardware/libraries. After that, open the arduino IDE, and go to Sketchbook/Examples/Library_Firmata/Standard_Firmata. Burn this to your Arduino.

See the attached patch for an example of what you are trying to do, once you get Firmata installed. On the hardware end, connect photodetector to power and pin2.

http://www.pdpatchrepo.info/hurleur/arduino_din.pd

is there any differences between the firmata and the simple messaging system? I'm also working with IR sensors, arduino connected to PD, and i need to read inputs from the arduino, so which external is better? I've tried the firmata, it works well, but i still don't get how this external works...

@lunchbox said:

is there any differences between the firmata and the simple messaging system? I'm also working with IR sensors, arduino connected to PD, and i need to read inputs from the arduino, so which external is better? I've tried the firmata, it works well, but i still don't get how this external works...

Yep, there is a difference. The difference is that firmata is designed to let everything happen in software, rather then on the arduino (see my attached example on the other post for an example of how to read your IR sensors)

Better is subjective. I like Pd coding better, so I use pduino and firmata.

So, to recap, burn firmata standard on your arduino, use Pduino, and code the app in pd, for easy, graphical, dynamic programming (pd-style) otherwise, interpret the messages in some other format, and do it some other way. It's up to you.

My attached example is definitely the easiest way to achieve your goals, in my opinion. You get the bonus of having pretty simple conversion from Arduino-languuage examples into pd-friendly code, rather then using some intermediary language that you have to code for on both ends (arduino interprets inputs, emits OSC or something else on serial, pd interprets OSC or something else and does stuff, blech!) instead you can just route incoming messages in pd, the same way you would with midi, a joystick, keys, or whatever.

Once you get pduino all setup, and my above patch works, try right-clicking on Pduino object, and choosing help. It actually has a pretty nice help file, which is how I figured all this out.

well, thank you there konsumer, but i have another question. I've setup the PD and IR sensor, so that every output from the sensor will trigger a bang. But since the characteristic from the sensor is that it will give a high output twice from a single detected movement. The problem is, i only need the sensor to trigger a bang once. Do you have any idea how to solve this problem? many thanks in advance

you could use some [spigot] solution perhaps? connect your bang to a toggle and the signal inlet and thusly your double bang will be reduced to a single bang in a way... I seem to remember doing something like it in a patch(or trying to anyway, my recollection eludes me atm if it worked or not but I hink it did :P).. At work now though, so don't have PD here to check myself...

An easy way to do it with pduino/pd, try like this:

[ ] <- toggle
|
[select 0]

the first output of select is a 1/2 banger, the input of the toggle is where your doubled bang goes.