/* it is a 1024 imps -> 4096 because we see 1/4 period
* and diameter: 55mm -> perimeter 134mm
* dist_imp_mm = 4096/134 x 10 -> 304 */
/* increase it to go further */
/* it is a 1024 imps -> 4096 because we see 1/4 period
* and diameter: 55mm -> perimeter 134mm
* dist_imp_mm = 4096/134 x 10 -> 304 */
/* increase it to go further */