diff --git a/adapter_ard.h b/adapter_ard.h
index 8bad6c6..fddd318 100644
--- a/adapter_ard.h
+++ b/adapter_ard.h
@@ -12,6 +12,8 @@ int analogRead(int pin);
 void digitalWrite(int pin, int level);
 void analogWrite(int pin, int dc);
 
+#define constrain(amt,low,high) ((amt)<(low)?(low):((amt)>(high)?(high):(amt)))
+
 class serial_c{
   public:
     void begin(int br);
diff --git a/projet-tuteure-3a b/projet-tuteure-3a
index ce0b434..c54363f 160000
--- a/projet-tuteure-3a
+++ b/projet-tuteure-3a
@@ -1 +1 @@
-Subproject commit ce0b434e97b67f3418c473741f55fd31ef20684b
+Subproject commit c54363fde2edebb39355ba264c1b85dd2258bef4