VDI-RODERICO

[kroman01]

a simple converter can be made with the help of resistors see how it was solved in Fortune_Pro_2 it is a serial interface

https://drive.google.com/drive/folders/1MbvcaFgtOmQCRL8sOqSOIiBTMBLv-jrv

[roderico]

ok, I can write the driver for the ST7567 controller, I have one of this zolen displays I never used that claims to be 5V, if it works it should also work with your display (http://www.blaberk.com.pl/arduino/DEM128064O.pdf) but you would need to do the conversion from 5V to 3V

[Altra]

I not sure what to make of it? View the revisions on the last page of datasheet "Version 1.0a - Modify Logic power supply VDD - VSS = 4.0V to 5.5V, VOUT= -18V" . Newer datasheets do not show the older revisions

http://www.hpinfotech.ro/ST7565.pdf

The displays I have been using at +5 volts are controlled by SPLC501C that is a clone of the ST7565 which can use the same drivers.
Datasheet claims 2.4v to 5v operation

https://www.newhavendisplay.com/app_notes/SPLC501C.pdf

[roderico]

I have adapted the code and the zolen display from ebay seems to work well with 5V, the only issue I have found so far is that it has no K- pin to control the backlight, a possible solution could be to cut the K- track on the display and connect it to the vdi to make it work, once I implement the contrast control I could upload a testing firmware for the ST7565 controller

[kroman01]

what serial or parallel interface you used on this display "zolen"

[roderico]

parallel and 5V, these firmwares will only work with parallel interfaces because they have lower latency and do not need 128x64/8 = 1024 bytes of additional memory in the microcontroller (e.g. PIC18F25K22 has only 1536 bytes)

[roderico]

this is the firmware 2.1 + ST7567/ST7565 driver for testing, the display should be connected to the vdi pcb as follows:

CSTB (e.g. /CST) -> CS1
RSTB (e.g. /RST) -> RST
A0 (e.g. D/I) -> C/D
RWR (e.g. /WR) -> R/W
ERD (e.g. /RD) -> EN

The configuration pins if they are not set should be

PSB -> High (parallel)
C86 -> Low (8080-series MPU)
SEL[2:1] -> Low, Low (1/65 duty)

the rest of the pins have the same name, CS2, V0 and VEE are not used, the lcd contrast is controlled by software, only tested with the zolen display (5V+parallel). The only issue found is that the backlight control does not work because the K- pin is connected directly to VSS in the display pcb.

[kroman01]

words of appreciation ... I did not think it would be so fast, I am at the stage of ordering the display, I thought it should be good

http://www.artronic.com.pl/o_produkcie.php?id=1153

[roderico]

that display also looks good to me, in principle it should work and it does not have the problem of the backlight, the zolen display from ebay is smaller and lighter but probably it needs to be disassembled to cut the K pin of the backlight...

[scrungy_doolittle]

I hate SPI, but they do save pins. I'm not understanding the issues with backlights. Typically, a monchrome lcd needs the backlight for the display to be visible. I know that it is absolutely the case for color displays. I've been working with a 128x160 color display. Don't know what it would look like in sunlight, but they are all over the place on ebay...

[scrungy_doolittle]

That zolen display looks great. I just snagged two off ebay.

[Altra]

I'm not understanding the issues with backlights.

I don't think it is a problem my version has the backlight "K" soldered to ground and the led "A" is on the edge connector with a 34 ohm current limiting resistor mounted to the pcb. You can use a switch between LedA to +5v or a pnp transistor switched by the micro. Or just leave it disconnected.

Knowing Chinese stuff there may be multiple versions? Mine has 16 pins

[roderico]

You can use a switch between LedA to +5v or a pnp transistor switched by the micro.

this could be the best solution since it would work with all displays but it requires a new revision for the pcb (e.g. for v2.2), mine has the same pins

Don't know what it would look like in sunlight, but they are all over the place on ebay...

you can compare a mobile phone and a lcd watch in direct sunlight, the mobile backlight probably uses a lot of current and here it is limited to less than 100mA and the lcd does not need backlight

[roderico]

the fix for the backlight could be something like in the attached file (R11 needs to be tuned with Q1 and the display)

[SWL]

Hello! I ask you to clarify the scheme. Do I need to set Y1, C12, C13 when using PIC16F886? Thank!