serialBegin — Open a serial port.
Here is an example of the serialBegin opcode. It uses the file serialBegin.csd.
Example 798. Example of the serialBegin opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -n ;;;no output ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o serialBegin.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 500 ; the default krate can be too fast for the arduino to handle nchnls = 2 0dbfs = 1 instr 1 iPort serialBegin "/dev/cu.usbmodemfa131", 9600 ;connect to the arduino with baudrate = 9600 kGain init 16 ;read our knob value kVal serialRead iPort if (kVal != -1) then kGain = kVal/128 endif aSig in ;get our audio input and get its rms kRms rms aSig*kGain kRms = kRms*kRms*255 ;scale the rms to a good value for the LED and send it out serialWrite iPort, (kRms < 255 ? kRms : 255) ;must be in range: 0-255 endin </CsInstruments> <CsScore> f 1 0 1024 10 1 1 1 1 1 1 i 1 0 200 e </CsScore> </CsoundSynthesizer>
This is the matching Arduino code :
void setup() {
// enable serial communication
Serial.begin(9600);
// declare pin 9 to be an output:
pinMode(9, OUTPUT);
}
void loop() {
// only do something if we received something (this should be at csound's k-rate)
if (Serial.available()) {
// set the brightness of LED (connected to pin 9) to our input value
int brightness = Serial.read();
analogWrite(9, brightness);
// while we are here, get our knob value and send it to csound
int sensorValue = analogRead(A0);
Serial.write(sensorValue/4); // scale to 1-byte range (0-255)
}
}
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