Issue#6 : reversed RX and TX between Arduino and MP3 module.

cad/boitarire/boitarire.kicad_prl

 {
   "board": {
-    "active_layer": 0,
+    "active_layer": 31,
     "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_nets": [],
@@ -37,6 +37,7 @@
       8,
       9,
       10,
+      11,
       12,
       13,
       14,

cad/boitarire/boitarire.kicad_sch

@@ -1466,6 +1466,11 @@
     (uuid fb54b757-071f-4d00-9006-2561726d8a6b)
   )
 
+  (text "Issue#6 : RX and TX are reversed \nbetween sender and receiver"
+    (at 108.585 105.41 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 38a8d673-3133-47d4-9231-4f27b5b074f4)
+  )
   (text "Or 100 µF / 10V min" (at 169.545 74.93 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 601c1b0c-f781-4051-8dd0-60745b7ded1f)
@@ -1511,7 +1516,7 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 568b9c6b-88a8-40d5-b1e9-229929cd0097)
   )
-  (label "RX" (at 147.955 104.775 180)
+  (label "RX" (at 147.955 102.235 180)
     (effects (font (size 1.27 1.27)) (justify right bottom))
     (uuid 58a98ccc-ee88-4d23-b047-6675f0817d69)
   )
@@ -1563,7 +1568,7 @@
     (effects (font (size 1.27 1.27)) (justify right bottom))
     (uuid d98652e5-a72e-4e04-83d0-380a9e52a541)
   )
-  (label "TX" (at 147.955 102.235 180)
+  (label "TX" (at 147.955 104.775 180)
     (effects (font (size 1.27 1.27)) (justify right bottom))
     (uuid dca0b764-9a0f-4ac1-8ba9-a9963df317a3)
   )