8-bit MicrocontrollersのトピックRe: Accelerometer output to tilt angle conversion? https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175744#M12227 <HTML><HEAD></HEAD><BODY><P>rocco,</P><P>&nbsp;</P><P>I got it, thanks very much.</P></BODY></HTML> Fri, 21 Oct 2011 14:27:20 GMT Bobli 2011-10-21T14:27:20Z Accelerometer output to tilt angle conversion? https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175742#M12225 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>&nbsp;</P><P>For accelerometers such as MMA7660, by reading registers {<STRONG>XOUT</STRONG>, <STRONG>YOUT</STRONG>, <STRONG>ZOUT</STRONG>} the digital output can be immediately obtained.</P><P>&nbsp;</P><P>However, how to convert these outputs into tilt angles? Namely, what is the relationship between physical <SPAN style="color: #ff0000;">tilt angle</SPAN> against the gravity/perpendicular axis, and the sensor’s {XOUT, YOUT, ZOUT} readouts?</P><P>&nbsp;</P><P>It should in general be <SPAN style="color: #ff0000;">non-linear</SPAN>. Then what is the <SPAN style="color: #339966;"><STRONG>formula</STRONG></SPAN> for conversion? Could Freescale provide some help on this?</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>Bob</P></BODY></HTML> Fri, 21 Oct 2011 05:04:40 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175742#M12225 Bobli 2011-10-21T05:04:40Z Re: Accelerometer output to tilt angle conversion? https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175743#M12226 <HTML><HEAD></HEAD><BODY><P>Hi Bob,</P><P>&nbsp;</P><P>It is simple trig. Gravity is a vector, so all you need to do is to treat the three axes as vectors, sum them, and the resulting vector is straight down.</P></BODY></HTML> Fri, 21 Oct 2011 06:17:47 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175743#M12226 rocco 2011-10-21T06:17:47Z Re: Accelerometer output to tilt angle conversion? https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175744#M12227 <HTML><HEAD></HEAD><BODY><P>rocco,</P><P>&nbsp;</P><P>I got it, thanks very much.</P></BODY></HTML> Fri, 21 Oct 2011 14:27:20 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Accelerometer-output-to-tilt-angle-conversion/m-p/175744#M12227 Bobli 2011-10-21T14:27:20Z