diff --git a/implementation/accelerometer.c b/implementation/accelerometer.c
index 6055f8a..2c8cf4e 100644
--- a/implementation/accelerometer.c
+++ b/implementation/accelerometer.c
@@ -31,29 +31,41 @@ void Init_accelerometre()
 	MySPI_Set_NSS();//CS HIGH
 }
 
-void Lecture_accelerometre(float *GX, float* GY, float* GZ)
+void Lecture_accelerometre(float* GX, float* GY, float* GZ)
 {
-	int dataX ;
-	int dataY ;
-	int dataZ ;
+	int16_t dataX ;
+	int16_t dataY ;
+	int16_t		dataZ ;
 	
 	MySPI_Clear_NSS(); //CS LOW
 	
 	MySPI_Send(0xF2);//lecture 1er registre accéléromètre + lecture multibytes
-	dataX = MySPI_Read()<<8; // données sur 13 bits passage 8 bit en PF
+	dataX = MySPI_Read()<<8; // données sur 13 (12 data + sign) bits passage 8 bit en PF
 	dataX |= MySPI_Read(); //lecture SPI
-	dataX &= 0xE; //masquage au dessus du bit 13
+	dataX &= 0x1FFF; //masquage au dessus du bit 13
+	if (dataX > 511)
+	{
+	dataX -= 1024;
+	}
 	*GX = dataX*0.004;//valeur du registre x pas accelerometre
-	
+		
 	dataY = MySPI_Read()<<8;
 	dataY |= MySPI_Read();
-	dataY &= 0xE;
-	*GY = dataY*0.004;
+	dataY &= 0x1FFF;
+	if (dataY > 511)
+	{
+	dataY -= 1024;
+	}
+	*GY = dataY*0.004;//valeur du registre x pas accelerometre
 	
-	dataZ = MySPI_Read()<<8;
-	dataZ |= MySPI_Read();
-	dataZ &= 0xE;
-	*GZ = dataZ*0.004;
+	dataZ = ((MySPI_Read()<<8)|MySPI_Read());
+	dataZ &= 0x1FFF;
+/*	if (dataZ > 511)
+	{
+	dataZ -= 1024;
+	}
+*/
+	*GZ = dataZ*0.004;//valeur du registre x pas accelerometre		
 	
 	MySPI_Set_NSS();//CS HIGH
 }
\ No newline at end of file