You didn't say how you had the other pins connected. So: - VPP should be around 60V. A cathode will be off when its voltage is pushed to VPP. - GND, VBIAS and HVGND should all be at 0V. A cathode will be on when its voltage is pulled to this. - All the chips, apart from the first one, should have DOUT connected to DIN of the next chip. - Use the SPI library to shift data in to the chips, then pull LE low, then push it high. - With POL high, a 1 in the data will be a high on the corresponding HV output, which would turn the cathode off. Reverse if POL is low. - There are four possible combinations of the setup arguments to SPI - they affect the relative timing and polarity of the toggles to CLK and DIN. You will also need to set the speed at which the data is shifted out if memory serves me right.
Write some code that shifts a specific pattern of data to the tubes - you will want to only turn on one cathode on each tube, so if POL is low, you will want to set one bit for each tube. If you don't see what you expect, mess around with the SPI parameters, POL and the bits you set until you get what you are expecting. On Thursday, November 3, 2022 at 5:45:03 PM UTC-4 [email protected] wrote: > Hi, as my final Masters Degree thesis in Microelectronics I decided to > create portable/small form-factor nixie tube clock using ZM1082T. Whole > project is circled around modern connectivity, so I am using USB type-c for > programing and powering plus Wi-Fi connectivity and all that. So simply > put, I designed my own PCB, which is thing I do and it's fine, but besides > some pinout and footprint miss-steps, everything about that is fine, all my > features (temp, buzzer, RGB Neopixel backlight, Wi-Fi, USB-C powering and > programing, protections, RTC) are working flawlessly. My problem is, I am > not a programmer, and all the features mentioned above were tested using > example libraries and that's fine for having something from which I can > kick-off and create final whole code, but with HV528 it's different story. > In this whole Group there is not much about using push-pull configuration > HV chips from microchip (which, believe me, if I could, I wouldn't have > chosen this chip, but chip shortage, availability, money, my country > shipping, etc..... that's why and this is what I got). With poor datasheet > details from microchip, POL and BP pins are for me quite a mystery and when > creating schematic and PCB I left BP open and POL with LE, CLK, DIN were > connected to ESP (on SPI pins, POL and LE to GPIO). which should be fine > based on my reasearch, but for the love of god, I can't seem to figure out > to test it, and control it. Only thing I could manage was that all cathodes > were glowing :D. But basically I am too lazy and time limited to create > some code "now" to test it. I was hoping for some libraries and examples or > some simple shift registers examples, which could be transferred to this, > but no luck. > > So if anyone, is interested in this "problem" and shows some interest, I > am willing to show more, fotos, schematics, but for now, I don't want to > post anything (our school algorithms would thing I copied from here and I > would be flagged for plagiarism, stupid, I know, but no point in risking > it...). So thanks everyone for any comment. > Looking forward to interesting conversations. > > PS: probably to catch your interest, here are some unrendered 3D models > from Altium. > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/27b96c3b-8aef-4c82-81f9-86f983e92457n%40googlegroups.com.
