"the tan,sin,cos are multiplied by 1.9--- delete this 1.9 so in the last part in DCM void Euler_angles(void) { #if (OUTPUTMODE==2) // Only accelerometer info (debugging purposes) roll = atan2(Accel_Vector[1],Accel_Vector[2]); // atan2(acc_y,acc_z)…"

"first : connect the tx and rx in arduimu --to-- rx and tx in foca 2.2
second: while uploading the code press the reset button in the arduimu"

"just press the reset button of the imu while uploading"

"thanks, the peoblem is solved, who want to know just ask me here"