#robotics Logs

Dec 12 2012

19:44 m_itx fondles his encoder and decides to draw an eagle part fo
19:52 Tom_itx dammit. alps doesn't provide pdfs
19:55 rue_mohr apls?
20:04 Tom_itx aspl
20:04 Tom_itx http://www.alps.com/products/WebObjects/catalog.woa/E/HTML/Encoder/Incremental/EC11/EC11E15244B2.html
20:19 Tom_itx rue_mohr, would a 74HC4050D work as a level converter for SD?
20:21 Tom_itx apparently so
20:33 Tom_itx rue_mohr, how do i determine the output 'HI' level with input at 5v? http://www.nxp.com/documents/data_sheet/74HC4050_CNV.pdf
20:33 Tom_itx i see a bunch of numbers but not sure which one relates to the 'output hi'
20:34 Tom_itx i get 3.84v? with standard temp parts
21:03 rue_mohr input or output
21:04 rue_mohr the miniumum voltage to be defined as a high is 1.5V
21:05 rue_mohr the maximum voltage to be defined as a low is .5V
21:06 Tom_itx i read .1 as the low
21:06 Tom_itx @4.5v vcc
21:06 rue_mohr is the max is .5 then .1 is considered low
21:06 Tom_itx i think i'll use one of my level shifters instead
21:07 Tom_itx i have them
21:07 Tom_itx and i don't have a 4050
21:17 rue_mohr I can send you a rail of 4049
21:17 Tom_itx i'm about done drawing it now
21:18 Tom_itx i think the level shifter was the reason my SD didn't work before
21:18 rue_mohr so the reverse masking hit some problems
21:18 Tom_itx i was using a max chip and it's different than this one
21:19 rue_mohr one of which being that eagles board size limit screws up the mill outline script
21:19 Tom_itx anyway, this board is gonna add a LCD, the encoder and SD to the 2560 as a plug in
21:19 rue_mohr you cant place the layout within the corner of the page area
21:19 Tom_itx what ver eagle are you using?
21:19 rue_mohr that a new windows one
21:19 Tom_itx 6?
21:20 rue_mohr you know how they limit the board size?
21:20 Tom_itx yes
21:20 rue_mohr I dont know right now
21:20 Tom_itx that's wny i haven't upgraded
21:20 rue_mohr they always had that limit?
21:20 Tom_itx i'm still using 4.16
21:20 Tom_itx no, i got a license for that one
21:21 rue_mohr my linux is 5.12
21:21 Tom_itx you need bigger boards?
21:21 rue_mohr no, the plot location isn't compatible with the mill outline script
21:21 rue_mohr I cant put the board in a place that exists on my plotter
21:40 rue_mohr http://eds.dyndns.org/~ircjunk/tutorials/mech/silkscreen/p1020239.jpg
21:41 rue_mohr http://eds.dyndns.org/~ircjunk/tutorials/mech/silkscreen/p1020241.jpg
21:41 rue_mohr for making silk screen pcb's
21:41 Tom_itx hope the LCDs arrive soon
21:43 rue_mohr Tom_itx, no the frame is window screen frame
21:44 rue_mohr I think I made the tool based on a tool I saw on the internet
21:44 rue_mohr one of those "well damn, I can just make one of those"
21:44 Tom_itx the way they map these pins in marlin is stupid. arduino is stupid
21:44 rue_mohr :)
21:44 rue_mohr no comment
21:45 Tom_itx but i'm getting it
21:45 rue_mohr what are you doing to it?
21:46 Tom_itx with what? the 2560?
21:47 Tom_itx nothing much but i'm making a carrier board for the lcd, encoder, SD and screw terminals for the axis step and direction
21:47 Tom_itx may never make it but i'm drawing it
21:49 Tom_itx i'm to a point i can reference boards i've already done so making this one isn't so bad
21:58 Tom_itx rue_mohr, does the 2560 have a 3.3v reg on it?
22:06 rue_mohr no?
22:06 rue_mohr the board does, iirc
22:06 rue_mohr but its running at 5 iirc
22:08 Tom_itx yeah but if it has one i won't have to put one on the SD part of this
22:13 rue_bed I dont think it does
22:14 m_itx looks at rue's nick and fr
22:18 rue_bed I'm beat
22:24 Tom_itx i'm gonna call it a night as well
22:24 Tom_itx i think i'll fix this board tomorrow
22:25 Tom_itx it would be nice to have a hot air station
22:57 rue_bed make one