sonify.ck to data-sonification

webchuck/data-sonification/sonify.ck

@@ -0,0 +1,64 @@
+//---------------------------------------------------------------------
+// name: sonify.ck
+// desc: CO2 sonification
+//---------------------------------------------------------------------
+
+// data file, don't forget to upload it first
+"co2_mm_mlo_2024.csv" => string filename;
+
+// file input output object
+FileIO fio;
+
+// open the data file
+fio.open( filename, FileIO.READ );
+
+// ensure it's ok
+if( !fio.good() )  {
+  <<< "couldn't open file", filename >>>;
+  me.exit();
+} else <<< filename, "opened ok" >>>;
+
+// read 1st line
+fio.readLine() => string header;
+
+// count how many rows of data remain
+0 => int rows;
+while (!fio.eof()) {
+  fio.readLine();
+  rows++;
+}
+<<< filename, "has", rows, "rows with columns of", header >>>;
+
+// declare arrays to hold the data points
+float date[rows];
+float val[rows];
+
+// re-open the data file now that we've counted the rows
+fio.open( filename, FileIO.READ );
+fio.readLine() => header; // skip over the header
+for (0 => int i; i < rows; i++) { // parse each row
+  fio.readLine() => string csvLine;
+  StringTokenizer strtok; // tokenizer uses space separated values
+  csvLine.replace( ",", " " ); // so replace commas
+  strtok.set(csvLine); // hand the line to tokenizer
+  string dateString, valString; // temporary storage
+  strtok.next( dateString ); // next token is date
+  strtok.next( valString ); // next is value
+  // convert strings to float numbers and store in arrays
+  Std.atof( dateString ) => date[i];
+  Std.atof( valString ) => val[i];
+}
+
+SinOsc osc => dac; // play the data with a sine wave
+for (0 => int i; i < rows; i++) { // loop through the data
+  osc.freq(val[i]); // assign co2 ppm to frequency
+  10::ms => now; // wait 10 ms
+}
+
+// when done playing, get the max value and print it
+-9999.0 => float maxVal;
+for (0 => int i; i < rows; i++) {
+  if (val[i] > maxVal) val[i] => maxVal;
+}
+<<< "maxVal", maxVal >>>;
+