Arduino to Pure Data

Arduino can output Serial data ( analog data ) from sensors connected to the arduino board.


01| CONNECTING SENSOR TO ARDUINO

1. Connect 5Volts to the Breadboard



2. Put a 1M Ohm resistor that leads the 5v to the channel where the light sensor will be.



3. When the resistor is in place, put the Light sensor ( or any other sensor ) behind the resistor, leaving 1 space at least.



4. Connect a cable from your Arduino's A0 Analog port to the space between the resistor and the light sensor. The cable will measure the data from the light sensor since the resistor is a Pull-up wich will pull current to itself. through the (white)cable.





5. Behind the Light sensor connect a last cable to the GND(ground)






02| MAKING THE ARDUINO PATCH

6. First connect your Arduino, go to Tools -> Serial port and check what port is selected. You will need to use this port in Pure Data later on.



this sketch reads the analog data from the A0 pin, which would be in a (0 - 1023) range. I divide it by 4 to get a value between (0 - 255) which is standard for serial communication.

void setup() {
Serial.begin(9600);
}

void loop() {
int sensorValue = analogRead(A0);
int serialValue = sensorValue / 4;
Serial.write(serialValue);
}

7. Upload the sketch to your arduino board and shutdown Arduino software.


03| MAKING THE PURE DATA PATCH

8. open Pure Data and make a New File

9. Make a new object "comport 9600" (9600 is the serial speed as defined in arduino)



10. make a message "devices" which you connect to the "comport" object.



11. when u exit edit mode in pure data (CTRL+E) and you click the devices message, you will see al the ports printed in the output window of Pure Data. Remember the port you selected in Arduino.



12. in Pure Data make a new message that states "Open #numberOfPort" in my example "Open 4". when you click this message in run mode (CTRL+E) you will see a message saying that the port is opened.



13. Now it's time to output the data that Arduino sends, so in the outlet from the "comport" attach a Number object. Normally you should see values changing in the number box. if not, check if arduino is turned on and the sketch is uploaded to your arduino



With this done you can add any object you want to the outlet of the number.
here's an example (low quality)

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