On Wednesday 02 May 2018 11:16:29 jeremy youngs wrote: > Given my issues with this computer I have decided to stop beating a > dead horse. I'm going to rpi 3 this thing.
Now I may rain on your parade. Based on my experience trying to find a decent pre-emptible kernel, I'm not sure I'd recommend a r-pi for a beginner. Shop ebay for a D525mW intel motherboard. The best r-pi kernel I have tried, still needs multople reboots before it gets a solid, usable comm path from its mouse or keyboard. The worse manifestation is seen by the use of the keyboard arrow keys to jog the machine, but the mouse response can be equally flaky. It throws away keyboard and mouse events, most often noticeable by the jog continuing when your finger is removed from the key. Rebooting it when that is noticed changes this behaviour and eventually you hit a bootup that Just Works(tm). And it will usually work fine until the next reboot. Mine has an uptime of: 17:56:28 up 35 days, 22:14, 3 users, load average: 0.84, 0.83, 0.85 Right now. > Gene I am addressing this > to you, what is my build requirements? When ready to move machinery, I'll send you a shrunken head version of debian jessie you can burn to a u-sd card, 32 and 64GB GB Samsung's seem to be rock solid. The shrunken head version means its a disk image that has a resize2fs in its initial bootup, so when you've rebooted it a second time it has recognized the card and expanded the filesystem to use the full cards size, which makes the cards wear leveling work for a loooong time. Up to then, the image is perhaps 500 megs more than the occupied stuff on the disk. > I.e. what hardware is needed > essential? . I have the 7i90, an svga monitor, USB keyboard and mouse. > The rpi has WiFi so it can network with my phone. I have too many neighbors with wifi, and they love to use my bandwidth, so the wifi on the pi is turned off. I only turn it on in the router when my kids are here for a weekend, which gives them a hotspot for their smartphones, but they still cannot see my home network. dd-wrt gives you total control. > 7i42 will come as > soon as I get a few things out of the shop. You'll need 3 of them, and 3 50 pin scsi-ii style cables for interconnects between the 7i90 and the machinery. Buy the cable, 2 feet is 2x what you'll need, a 6 pack of the 50 pin connectors and make your own jumpers in the shop vice for a lot less money. Theres a board on the oshpark site that is the basis for the spi connection between the pi and the 7i90. I think Jon drew it, so he might be able to supply that number. You'll need 3 teeny little chip r's of 120 ohms to source terminate the cable from the pi to the 7i90. Thats a fast bus. If you insist on servo's intead of steppers, you'll need a couple mesanet spinx1's to interface between the pwm signals and the servo's analog control inputs. Or use Jon's (Pico Systems) pwm-servo amps, which are a great product for around $130 a motor. I am using 2 of them to handle the 1 horse rated PMDC motors, one hanging off the back of my 7x12, and the OEM 1 horse of a Grizzly G0704, probably tapping it for close to 2 hp when its at full song. > A couple pics of interim servo motor mounts , I slapped together. The > y axis motor mount needs a bit more work. > https://drive.google.com/file/d/1hGnhYLYiY-NIqw9cBkR92UlNIlIJzKuG/view >?usp=drivesdk On a lathe version of LCNC, thats an x axis, y is skipped and carriage left<->right is z. With steppers, on the r-pi, no PID's are needed, and they double the computing the pi has to do, and you'll need them to control the servo's well. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
