Hi all. Ok so some progress. First PCBs have arrived and the K155ID1 IN12 based clock is almost complete. I also knocked up a very basic breakout board for a PLCC 44 pin socket to allow me to start testing with the HV5530 with a breadboard and am having mixed results.
To learn how to use the HV5530 I'm using LEDs connected to the outputs, each with a 220 ohm resistor in series in place of the nixie tubes and the connections from an ESP32 go through a CD4504BE with VDD at 12v. The LEDs have a common +5V and the POL pin on the HV5530 is tied to +12v https://reboots.g-cipher.net/time/ disusses how to write data to the driver. With only a single HV5530 connected and using digitalWrite() I'm able to blank / light all outputs reliably or target a single output. There is some flicker if I 'disturb' the wires on the breadboard but otherwise seems good. Adding a second driver (shared clock & latch pin, DO on driver one connected to DIN on driver two) causes all LEDs to flicker randomly and those on the second driver are not in the correct sequence. Using a separate set of pins for each driver improves things - the LEDs on driver two light as programmed - but there is still some flickering evident on all LEDs. Is there anything obvious I can change in the above to improve matters? I've seen several references to SPI but am 1) unsure why one would choose SPI over digitalWrite() and 2) it seems more difficult to implement. If anyone has a very simple example how to use SPI with the HV5530 and ESP32 I would be grateful. Thanks On Monday, 10 March 2025 at 11:49:58 UTC JBro63 wrote: > Thanks Ian, that's really helpful. > > On Saturday, 8 March 2025 at 08:33:06 UTC Ian Sparkes wrote: > >> They work fine at 5V. Never had a problem with one at 5V. >> >> But attention: ESP uses 3V3 and you might need to use a lever shifter >> (e.g. CD40109) to make it work. >> >> On Monday, 3 March 2025 at 20:39:00 UTC+1 newxito wrote: >> >>> I use the HV5622, which goes up to 220 V, I think there is also a PLCC >>> version. The disadvantages are the price and that it should be operated >>> with 12V according to spec. However, I never had any problems using the >>> chip with 5V. >>> JBro63 schrieb am Montag, 3. März 2025 um 19:02:56 UTC+1: >>> >>>> Hi all, >>>> >>>> Group noob here, about to start build on a few different types of >>>> display using Nixie tubes and ESP32. >>>> >>>> Planning to use K155ID1 initially (as I have a bunch) with some IN-12 >>>> and IN14 tubes but want to also try HV driver such as the 5812 or 5530 so >>>> would welcome any comment on which is the best one to go for or an >>>> alternative. I don't intend to multiplex. Any driver would need to be DIP >>>> or PLCC. >>>> >>>> Have spent many hours looking at the schematics and designs of others, >>>> I'm grasping the basics but one frustration and evident gap in my >>>> knowledge >>>> is how to pick / calculate the correct component and its size or rating >>>> for >>>> anything other than the most basic circuit. >>>> >>>> For example, with a 180v supply, calculating the anode resistor for a >>>> tube based on the datasheet is straight forward enough as the maintaining >>>> voltage and current are known. >>>> >>>> When looking at something like the HV5812, many seem to use a 60 or 70V >>>> zener diode with a resistor to keep below the max for the chip but how do >>>> you determine the current needed for the driver, diode and load to be able >>>> to calculate the current limiting resistor? The diode datasheet is simple >>>> enough but I'm lost with the sheet for the HV5812. >>>> >>>> Thanks. >>>> >>>> -- 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, visit https://groups.google.com/d/msgid/neonixie-l/30f72a51-0338-42e1-8c2a-d7c67d2b9377n%40googlegroups.com.
