Most Arduino kits but the smallest ones (i.e.: Mini) and Raspberry Pi have enough GPIO pins available to do it without need to resort to serial to parallel. Of course you can use any of the I2C chips available too. My philosophy is to adhere as much as possible to the KISS principle.
On Wednesday, June 5, 2019 at 11:11:31 AM UTC-3, Keith Moore wrote: > > This is accurate and great detail. I believe it is simpler than you might > think. This is just a parallel interface (times two). > > The work is done with the shifters and the data is pumped via a parallel > interface from the processor as in the original design. > I am just a software guy, but once I saw the trusty parallel chip, I > figured it was a parallel interface. > > So how does one drive a parallel interface from Arduino/Raspberry? > Probably via a serial to parallel converter board with a variant of IEEE > 1284 output. I have not looked into this yet, but that's where I plan to > start. > > Am I way off base? > > On Wednesday, June 5, 2019 at 4:47:46 AM UTC-4, andybiker wrote: >> >> Hi John, >> The scans you posted answer all of the questions. >> There is no "display controller" as you'd expect from the modern "fruit >> machine" displays. >> All we have on the board is latches and level shifters. >> pins 16,18,19 control a shift register (TL5812) to select the digit >> position to display (both displays selected at the same time) >> there are then 4 latches - 2 for segments on top display, 2 for segments >> on bottom display >> These latch the 8 bit data bus (pins 4 to 11) to each level shifter. >> the first 3 latches are internal to an 8255 (antique i/o port that I last >> used in the early 80s) - selected with /A7 (pin3) low , /SEL4 (pin 13) low >> and /WR (pin1) low /RD (pin 2) HIGH >> A0 and A1 (pins 14 + 15) select which one of the 3 latches to use (and >> initialise the 8255) >> As this part only has 3 latches and we need 4, an extra latch has been >> bolted on in the form of IC2 (74ls273) >> This is selected with /SEL4 (pin 13) low, /A7 (pin 3) HIGH, /WR (pin1) low >> (I think reset should be kept high - need to check data sheets) >> Supplies are 47v, 5v, 4.5vAC for the filament. >> >> Data sheets are available for all of these chips. >> I suspect that driving one is "a full time job" for something like a >> simple arduino. >> >> I hope my ramblings help someone, >> Cheers, >> Andrew >> >> >> On Tuesday, June 4, 2019 at 9:52:24 AM UTC+1, Nixcited delighted wrote: >>> >>> I now have my displays and the schematic. >>> >>> I have scanned relevant manual pages, power supply, interconnect, >>> display board and component identification. >>> >>> https://www.dropbox.com/s/bltgd4w4o9gonuy/Alvin_G_Display.zip?dl=0 >>> >>> John S >>> >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/76158a03-169e-43bb-9082-db32fa592622%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
