+CC Andreas. On Mon, 17 Jun 2019 21:21:37 +0200 Zbyněk Kocur <zbynek.kocur@xxxxxxxxxxx> wrote: > Hello, > > I try to use linux kernel module for proximity sensor SRF04 and i was not able to measure distance longer than 1.5 m. The problem is on implementation maximum range filter in function srf04_read, line 145. The reasoning assumes that the distance to 3 meters is limited, but the direction back and forth is neglected. Therefore, the resulting limit is a maximum of 1.5 meres and not a required 3 meters. The solution is to come out of the formula: > > * distance 2 * 3 m > * time = ---------- = --------- = 18808777 ns > * speed 319 m/s > * > > > Best Regards, > Zbyněk Kocur > --- > email: zbynek.kocur@xxxxxxxxxxx > phone: +420 224 354 054 > web: http://www.fel.cvut.cz > Department of Telecommunications Engineering > Faculty of Electrical Engineering >
