Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sun, 21 Apr 2024 14:40:25 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: Laser Mouse Date: Sun, 21 Apr 2024 07:38:39 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: References: <8lit1jd210tmtl0p2h5dotog3ji7nsv8ph@4ax.com> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Lines: 55 X-Trace: sv3-tMWGU1UTXfkQjfLCEGYat82+S0N0Qsg/aNIPKRe5qFHh0Oe7P5aGL6Hx9GkZ1oPCrtZhP36EOvBNySi!5qYWBEKt9OKRY46O3Z2XZOIrIofndEahUKRR4u0XQLZ7vvnMMIsN+1twMgQfyEGf401pO0edmSkW!YH9h7g== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 3699 On Sat, 20 Apr 2024 19:07:42 -0700, Jeff Liebermann wrote: >On Tue, 16 Apr 2024 12:06:19 -0700, john larkin wrote: > >>If you have an Ikea desk and your LED optical mouse doesn't work right >>(something about the optics of the varnish) this should fix it: >> >>https://www.amazon.com/dp/B08CRZ85DZ >> >>It was really annoying to be tweaking a PCB layout and having the >>cursor wander around, or get stuck. > >I think that's called "hunting". This might help explain what's >happening: > >"Optical vs Laser Mouse" > > >"...both methods use the irregularities of a surface to keep track of >the peripheral’s position. But a laser can go deeper into the surface >texture. This provides more information for the CMOS sensor and >processor inside the mouse to juggle and hand over to the parent PC." > >"This makes laser-based mice better for glass tables and >highly-lacquered surfaces..." > >"The problem with laser-based mice is that they can be too accurate, >picking up useless information such as the unseen hills and valleys of >a surface. This can be troublesome when moving at slower speeds, >causing on-screen cursor "jitter," or what’s better known as >acceleration." > >I've done a little tinkering with both types of mice. I used a >drawing program to draw a 1 pixel wide line. The optical mouse drew a >fairly "sharp" edged line. The laser mouse drew a tiny sawtooth >waveform (jitter). It can be cleaned up with averaging and damping, >but that increased response time, which was deemed highly undesirable >by the gamers in attendance. It was also possible to see building, >motor, and machinery mechanical vibrations along the line. That >disappeared for both types of mice when I used a rubber backed mouse >pad or installed rubber "carpet protectors" under the desk legs. > >No advice. Just try a few different mice and use whatever works best. I don't freehand draw lines as such, but I'm sure some people do. Schematic entry and PCB layout make straight lines that are quantized to a grid, or move parts and traces on the grid, and the LED mouse on the Ikea desk made it hard to do that. I was talking yesterday to Mo about drawing, in a cafe with cool watercolors of city scenes on the walls. She can draw. She said "you draw too" and I noted that I only do it with straight lines on a rectangular grid. Well, rarely, a circle.