diff --git a/docs/index.md b/docs/index.md
index 88c937e..1905524 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -31,6 +31,7 @@ hide:
 1. Don't forget the stamp
 
 !!! note annotate "7. Pianino (1)"
+    [Day 07](solutions/07/07.md)
 1. Play me!
 
 !!! tip annotate "8. Will you get the lowest temperature? (1)"
diff --git a/docs/solutions/05/05.md b/docs/solutions/05/05.md
index bece8b0..86d7d96 100644
--- a/docs/solutions/05/05.md
+++ b/docs/solutions/05/05.md
@@ -1,4 +1,4 @@
-# Day four:
+# Day five:
 
 Play a Christmas carol (or a song you like) using the Barduino.  
 
diff --git a/docs/solutions/07/07.md b/docs/solutions/07/07.md
new file mode 100644
index 0000000..df01d81
--- /dev/null
+++ b/docs/solutions/07/07.md
@@ -0,0 +1,72 @@
+# Day seven:
+
+Make an instrument wit the Barduino.
+
+2 days ago you played some preprogrammed tunes, but now it's time to read some inputs and make sounds acording to them! Be creative, you can play with the different inputs...
+
+Here is my solution, playing notes with the touch pads reacting to light! I ave to practice a lot more... 
+
+## Possible solution!
+
+### Arduino code
+
+```c++
+const int buzzer = 14;
+int pressed = 0;
+
+const int photo = 3;
+const int threshold = 27000;
+
+unsigned long values[] = {0,0,0,0};
+int playing = 0;
+
+note_t notes[] = {NOTE_C, NOTE_D, NOTE_E, NOTE_F, NOTE_G, NOTE_A, NOTE_B};
+
+void setup() {
+  ledcAttachPin(buzzer, 1);
+  pinMode(photo, INPUT);
+  Serial.begin(115200);
+}
+
+void loop() {
+  unsigned long max = 0;
+  int max_i;
+  for (int i=0; i<4; i++){
+    values[i] = touchRead(i+4);
+    //Serial.println(values[i]);
+    if (values[i] > max){
+      max = values[i];
+      max_i = i;
+    }
+  }
+  if (max > threshold && playing != max_i + 4){
+    playing = max_i + 4;
+    int val = map(analogRead(photo), 0, 4095, 0, 35);
+    //int val = 33;
+    Serial.println(val%7);
+    int note = val%7+max_i;
+    int oct = (val/7)+2;
+    if (note > 7){
+      note = note - 7;
+      oct = oct + 1;
+    }
+    
+    Serial.print("Note: ");
+    Serial.print(note);
+    Serial.print("  Oct: ");
+    Serial.println(oct);
+    ledcWriteNote(1, notes[note], oct);
+  }
+  else if (max <= threshold && playing != 0){
+    Serial.println("off");
+    playing = 0;
+    ledcWriteTone(1, 0);
+  }
+}
+```
+
+## Hero shot
+
+<video controls autoplay loop style="display: block; margin: auto;">
+    <source src="../../../video/day07.mp4" type="video/mp4">
+</video>
\ No newline at end of file
diff --git a/docs/video/day07.mp4 b/docs/video/day07.mp4
new file mode 100644
index 0000000..ccac7a5
Binary files /dev/null and b/docs/video/day07.mp4 differ
diff --git a/mkdocs.yml b/mkdocs.yml
index 7a66a2c..331f8ac 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -19,6 +19,7 @@ nav:
     - Day 4: solutions/04/04.md
     - Day 5: solutions/05/05.md
     - Day 6: solutions/06/06.md
+    - Day 7: solutions/07/07.md
   - Solution template:
     - template.md