diff --git a/12/index_test.html b/12/index_test.html
index bb5a824..d006aae 100644
--- a/12/index_test.html
+++ b/12/index_test.html
@@ -9,6 +9,10 @@
+
+
+
+
diff --git a/12/sketch.js b/12/sketch.js
new file mode 100644
index 0000000..23923a7
--- /dev/null
+++ b/12/sketch.js
@@ -0,0 +1,22 @@
+let mic, fft;
+
+function setup() {
+ createCanvas(710, 400);
+ noFill();
+
+ mic = new p5.AudioIn();
+ mic.start();
+ fft = new p5.FFT();
+ fft.setInput(mic);
+}
+
+function draw() {
+ background(200);
+
+ let spectrum = fft.analyze();
+ beginShape();
+ for (i = 0; i < spectrum.length; i++) {
+ vertex(i, map(spectrum[i], 0, 255, height, 0));
+ }
+ endShape();
+}