Help in arduino sketch for a multiplexing.

[Benoit Tourret]

Hello,
I made my first nixie, it is quite like "my first nixie, by Playskool"
It's even not a nixie, this is a VFD IV-18.
The Hardware is quite simple, a Wemos D1 mini and a small SOP-4 adapter for the MAX6921awi.
the 30V is from a DC-DC converter. No PCB, simplier, you die.
(got it here: https://www.thingiverse.com/thing:3417955)

it works from scratch, just the brightness at 0, but the big dot on the left was on before being connected to the wifi.

unfortunately, the firmware is quite awfull. : http://192.168.4.1/?B=80  to set the brightness to 80%
I thought I could make something better. but no...

One day, I see this project: https://forum.arduino.cc/t/iv-18-vacuum-fluorescent-display-ntp-clock/655222
this firmware is much better !!!
(https://forum.arduino.cc/uploads/short-url/hsgq9LJgaIPSupPYY7fFbfiCs7d.zip)

I modified the GPIO as follow:

Data D4 -> D5
Clock D0 -> D7
Strobe D7 -> D6
Blanking D8 -> D8 (but I had to ground it to light the digits.)

I could compile it, it works, except that the segments are completely scrambled.
good point, the hardware is compatible, I will just have to remap the segments and the grids.

so easy to say, but I didn't succeed in anything....
I made the pin connectivity of the two boards, to see the differences.

Here they are:

IV-18 MAX6921 HV5812
pin   board program

Segm.-A out00 hv13
Segm.-B out02 hv15
Segm.-C out05 hv18
Segm.-D out06 hv19
Segm.-E out04 hv17
Segm.-F out01 hv14
Segm.-G out03 hv16
Seg.-pt out07 hv20
Grid-1 out18 hv08
Grid-2 out11 hv01
Grid-3 out17 hv07
Grid-4 out12 hv02
Grid-5 out16 hv06
Grid-6 out13 hv03
Grid-7 out14 hv04
Grid-8 out15 hv05
Grid-9 out19 hv09

Is it in display.cpp or in the clock_esp_IV_18_v0_02P.ino ?

Help !!!

Regards,

Benoit.

[Benoit Tourret]

[Benoit Tourret]

It is OK, I got help from the guy who made this firmware.

It works !!! about 40€, finding elements one by one on ebay or amazon, including shipping.

you can add a RTC if needed !!!

Regards,

Benoit.