Panucatt Re Arm & BTT Mini 12864 V1

Hi!

I updated my old (but fancy) panucatt Re Arm board to Marlin 2.1.2.4 firmware version. I also took the chance to upgrade the LCD to a brand new BTT mini12864 screen. The thing is I'm not able to get any image on the screen... Backlight is working fine (even reset button is working) but nothing is shown on the screen.
I checked and rechecked firmware set up, pin out and wiring with no luck...

Any ideas what I could search about in order to solve this issue?

Thanks!

You need a custom EXP1 cable.

The re-ARM ramps-1.4 combo provides 3.3V on EXP1 pin 8. The BTT mini12864 needs 5V.

See [reprap.org] for details.

Thanks mate! Just to be clear, I need to wire LCD_CS to +5V and that's it? (besides re wiring EXP1 pin 1 to 5V and EXP1 pin 5 to re arm 1.16)



Edited 2 time(s). Last edit at 06/26/2024 11:15AM by martind_n.

no.

See the 5v pin on exp1 of the lcd, you connect that to 5v, because on the re-arm with a ramps and lcd adapter exp1 port is 3,3v

Here are the exp1 and exp2 pins when on the rearm



this is why re-arm comes with special cable

eg


Edited 4 time(s). Last edit at 06/26/2024 11:24AM by Dust.

Thanks Dust,

I'm aware about that mod, in fact I already did it and got the backlight working.

The problem is I can't get any image on the screen and then Bob suggested to connect EXP1 pin 8 to 5V, that's why my question about LCD_CS pin.

Your also going to have issues with lcd RGB_DIN pin, ie the neopixel back light, as that pin is not connected on the re-arm, you will need to connect it to an unused io pin. and telll the firmware where it is connected

Yep, already did this and works... But still no image on the screen...

Is there any other mod (Firmware/wiring) I should make?

Looking at pins_RAMPS_RE_ARM.h its using spi on J3 and J12 for your display

#define BEEPER_PIN P1_01 // (79) J12-12
#define BTN_ENC P1_04 // (77) J12-10
#define BTN_EN1 P3_26 // (31) J3-2 & AUX-4
#define BTN_EN2 P3_25 // (33) J3-4 & AUX-4

#define SD_DETECT_PIN P1_31 // (49) J3-1 & AUX-3 (NOT 5V tolerant)
#define KILL_PIN P1_22 // (41) J5-4 & AUX-4

#define LCD_PINS_RS P0_16 // (16) J3-7 & AUX-4
#define LCD_SDSS P1_23 // (53) J3-5 & AUX-3

#define DOGLCD_SCK P0_15 // (52) (SCK) J3-9 & AUX-3
#define DOGLCD_MOSI P0_18 // (51) (MOSI) J3-10 & AUX-3

// EXP1 on LCD adapter is not usable - using Ethernet connector instead
#define DOGLCD_CS P1_09 // (74) J12-7
#define DOGLCD_A0 P1_14 // (73) J12-6

#define LCD_RESET_PIN P0_16 // Must be high or open for LCD to operate normally.



Edited 1 time(s). Last edit at 06/26/2024 11:49AM by Dust.

So, and correct me if I'm wrong, I should re wire basically everything that is not on AUX4.

These two pins correspond to which ones in BTT EXP1 port?

DOGLCD_CS P1_09
DOGLCD_A0



Edited 1 time(s). Last edit at 06/26/2024 01:04PM by martind_n.