Giants Posted November 14, 2017 Share Posted November 14, 2017 Hi ! I recently buy modules for DIY pin2dmdhttps://fr.aliexpress.com/item/fashionable-best-full-color-indoor-p2-5-led-module-SMD-RGB-1-32-Scan-160x160mm-64x64pixels/32801568339.html Modules that I receive it's not RGB but GRB but, no matter, juste some wire to swap. BUT... my probleme is : When I use 5V power supply on this DMD Dmd connected with my STM32F4 Disc1 Discovery board (programmed with 2.49 Firmware of pin2dmd and upgraded from V2.J25.M14STM32 Debug+Mass Storage to V2.J29.M18) Impossible to have a correct display, only some line groupe, red, green blue... random on the display module with High luminosity. BUT, when i use a 3.3V instead of 5V to power the DMD. The display is correct. Below 3.3V, the color is not good (turn to red color) And over 3.3V, display nothing or some group of line very high very bright. With or without sd card with registration key do the same. The seller tells me that it comes from the firmware used in STM32F4 I have not yet tested old firmware version. Your opinion ? Mine it's a electric problem on this DMD but, I'm not sure. Thks a lot every body Link to comment Share on other sites More sharing options...
Rappelbox Posted November 14, 2017 Share Posted November 14, 2017 With v2.49 you don’t need to swap cables anymore. Please try with original pinout.I don’t know about the electrical differences of this particular panel so it could be helpful to have a picture of the back of these Greetings,Dom Link to comment Share on other sites More sharing options...
Giants Posted November 14, 2017 Author Share Posted November 14, 2017 Hi 2 pictures join in this message. As you can see, with straight cable, the Red and Green are inverted (I have also the confirmation of that of seller) but with swap pin 1-2 & 4-5(so pd0-pd1 and pd5-pd6), the color is now good (no picture join). Second picture you can see the DMD PCB. (P2.5 (2020)-16S-V1.0 With 3.3V of ATX power, the display is correct. I trying a lot of 5V power supply and so, always the same problem, don't work with 5V very strange.... Link to comment Share on other sites More sharing options...
Rappelbox Posted November 14, 2017 Share Posted November 14, 2017 You can use the config menu to correct the numbering of the colors! Press menu and option button at the same time to reboot the controller. Keep menu button pressed during boot to enter the config menu. With pressing the menu button you can cycle trough the various menu points like pinball system, rgb sequence (this is what you need!!!) etc. with the option button you can cycle trough the various options of each menu point. Don’t forget to save your config!!!I have the same panels here from a very old batch. Will try them tomorrow morning if they have the same issue with voltages. Greets,Dom Link to comment Share on other sites More sharing options...
Giants Posted November 14, 2017 Author Share Posted November 14, 2017 Ahh ! Ok, it's possible to change directly the configuration into a hardware menu. I don't know that, great Thks for this information I orde this DMD last month but, the seller tell me, they are not batch for 1/16 (because hardware instability problem) So he propose me a 1/32 but, normaly, the 1/32 don't work, so I insist to have a 1/16 or refund And so, it's send me I think what was left in stock ! Yes, If you can check if you have the same issue it will be great, Thks a lot. You can see (picture here) the display I have with 5VI needed to put several sheets to take the picture becausse it was very too bright And you see, no picture, just some group of line. Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted November 14, 2017 Content Provider Share Posted November 14, 2017 Could you make a close up picture of the input circuit of the panels. I need the name of the integrated circuits next to the connector. Link to comment Share on other sites More sharing options...
Giants Posted November 14, 2017 Author Share Posted November 14, 2017 Hi, Yes Of course Here, 300 Dpi scan 21mb size O_o' Scan_019.bmp Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted November 14, 2017 Content Provider Share Posted November 14, 2017 Can´t read the text on the ICs. You need to play with the angle to get better contrast. Link to comment Share on other sites More sharing options...
Giants Posted November 14, 2017 Author Share Posted November 14, 2017 PCB : P2.5(2020)-16S-V1.0 UR1, UG1, UB1, UR2, UG2, UB2,UR3,UG3,UR4,UG4,UB4, UR5, UG5, UB5, UR6, UG6, UB6,UR7,UG7,UR8,UG8,UB8 : CHIPONE ICN2026DP C CF 1J15.1U1, U2, U3 : SUM 74HC245T D1409AFP81a couple of 16 : 4953 4K2501x2 (below C29) : DP74HC138 4J2101cx3, cx4 : 220ùF 10V a lot of capacitor cmd : C1->C29 (not measured )a lot of resistor cmd : mark 29B (not measured but normaly 1.96Kohm) I thinks, it's all Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted November 15, 2017 Content Provider Share Posted November 15, 2017 I think it could a problem of the 74HC245T bus transceivers not recognizing the 3.3V high levels with a 5V supply voltage correctly. We had similar problems with very old panels and that is why we added 74HC245 on earlier pin2dmd shields. We removed them because newer panels did not need them because of the use of more 3,3V tolerant ICs (e.g 74HCT245). You can get around this problem by either getting a old shield pcb from uncle sash or rappelbox or using a power supply with adjustable output voltage. 4,5V should also work. Link to comment Share on other sites More sharing options...
Giants Posted November 15, 2017 Author Share Posted November 15, 2017 Hi Yes or change the 74HC245T by 74HC245 But notre easy if we don't have hardware to do this. Thks for your reply, i will try some h/w configuration like you Say. See you Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted November 15, 2017 Content Provider Share Posted November 15, 2017 You you need a 74HCT245. See the difference here https://assets.nexperia.com/documents/data-sheet/74HC_HCT245.pdf Link to comment Share on other sites More sharing options...
Giants Posted November 15, 2017 Author Share Posted November 15, 2017 Yes, if I remember the HCT chip are used because they are faster in I/O But, I don't have the good H/W to desoldering and re- soldering this. I can try but... not sure about the resultat and especially, I don't have a 74HCT245 in cms. I have a lot in normal socket ;), but not in CMS. I can of course order this, but it's very difficult if I don't have exactly a good a soldering station with his tools for cms. But, finaly, If it's work good with 3.3V... so...I can use 3.3V of my atx power suply. Link to comment Share on other sites More sharing options...
Giants Posted November 16, 2017 Author Share Posted November 16, 2017 Hi Just a last question. We are agree a 1/32 DMD don't work with M14STM32 F4 and last version of pin2dmd (2.49) ! Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted November 16, 2017 Content Provider Share Posted November 16, 2017 1/32 scan is 64x64 leds in one piece. You need two 32x64 panels. AFAIK there is no 1/32 scan panel with a height of 32. We use 1/32 scan panels for Sega 192x64 Link to comment Share on other sites More sharing options...
Giants Posted November 16, 2017 Author Share Posted November 16, 2017 ?? The seller tell me old me the opposite I have more confidence in you, It's certain. I will see with the seller if he can have me recent dmd 1/16, but he's not technical Tell him about 74HC245T, 74HCT245 ...it's like...recite a poem to a cow. It's coool but... it does not help much. Ok, Thks Link to comment Share on other sites More sharing options...
Giants Posted December 10, 2017 Author Share Posted December 10, 2017 Hi ! After a lot a tests, Only 3.3V work but it's realy random situation, a lot of color pixel issue when playing. Communication whith the seller is... difficult. Link to comment Share on other sites More sharing options...
Giants Posted December 10, 2017 Author Share Posted December 10, 2017 Hi ! After a lot a tests, Only 3.3V work but it's realy random situation, a lot of color pixel issue when playing. Communication whith the seller is... difficult. Link to comment Share on other sites More sharing options...
Giants Posted December 10, 2017 Author Share Posted December 10, 2017 Hi ! After a lot a tests, Only 3.3V work a little (bugs and bug and bug... all the time, color bug) but it's realy random situation, a lot of color pixel issue when playing. Communication whith the seller is... difficult. Link to comment Share on other sites More sharing options...
Giants Posted December 31, 2017 Author Share Posted December 31, 2017 Hi ! So... communication with the seller is impossible... he does not care about you. So, if you want to buy it on alyexpress, avoid the seller : Ever Shine Digital Advertising Store (https://evershine.fr.aliexpress.com/store/103659) Just an advice, don't buy with them. Now, I need to return to the original DMD 'orange' or find, in france, somebdoy wan and want to change the 74ls chipset... Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted January 1, 2018 Content Provider Share Posted January 1, 2018 There are older versions of the shield which have 74LS245 bus transceivers which should fix your problem. Maybe @UncleSash still has one of those. Link to comment Share on other sites More sharing options...
Content Provider UncleSash Posted January 1, 2018 Content Provider Share Posted January 1, 2018 I still have some V3 and V2 version Boards. Just PM me what you need. Link to comment Share on other sites More sharing options...
Giants Posted February 11, 2018 Author Share Posted February 11, 2018 Mp send to UncleSash Question but, I'have the 3.1Board version Maybe is they are a way to 'mod' my 3.1version with a 74LS245 or 74HCT245, make some solder and modification do not scare me Are they link to v3.1 and v2.0 schématic available on the net ? If I juste cut somme trace and Add a 74HCT245 with some wire... no problem. Second option is changing directly on DMD board but I can't find package information (so, dimension) of my SUM 74HC245T D1409AFP81 Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted February 11, 2018 Content Provider Share Posted February 11, 2018 https://github.com/lucky01/PIN2DMD/tree/master/hardware/V3 STM32F4 DISCOVERY You simply need to route all signals from the hub75 (R0,G0,B0,R1,G1,B1, A,B,C,D,E, CLK,STB,OE) port through two 74hct245. From the hct245 DIR and VCC port needs to be wired to +5V OE and GND to ground. Link to comment Share on other sites More sharing options...
Giants Posted February 13, 2018 Author Share Posted February 13, 2018 Hi ! If I MOD, I Add 2 x 74LS245 before HUB75 Input as you say, it will be enough ? I have a older Amiga 1200 PCB that have a 74LS245 (but bot 74HCT245) Link to comment Share on other sites More sharing options...
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