psmmacker Posted August 21, 2016 Share Posted August 21, 2016 P4 3x 100k ohm resister on the postive Done the trick and a rewire Brown.black.yellow.gold much easyier fix no soldering check last picture https://m.youtube.com/watch?v=ww-BUQHYFrQ Verible resisters pods hardware hack on the hub 75 for each r.g.b inputs may help this rgb1 and rgb 2 they are the colour input pins thats what missing on the shields one for each colour not sure if the hub75 is power driving or signal but changing the pot may take the green colour down as there r1 is panel r2 is panel 2 so we need 3 on 1st panel (left) and 3 between the dasiy chain for 2nd panel. (right) Link to comment Share on other sites More sharing options...
psmmacker Posted August 21, 2016 Share Posted August 21, 2016 Ya very CarnyPriest much What do u think of my fixes Thanks paul Link to comment Share on other sites More sharing options...
Content Provider CarnyPriest Posted August 21, 2016 Content Provider Share Posted August 21, 2016 I can't say that I'm good with hardware or knowledgeable about electronic components. I think I'd need this info condensed down into a single tutorial with build list, step-by-step, and pictures. I know it is here in the thread but it sounds like you tried a number of solutions to get to a final result. I think most people here would be looking to solve issues with p2.5 panels specifically. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Your right carny it seem to be voltage leak via the hub75 rgb signal and we need to loop back the 2nd panal back to the source of the stm 32 gio pins Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 I know there is 3 gnd on the rgb and 1 on the stm32 what about adding them earths to the earths of the back of the panels which has 4×2 on each i not tried this but before Could be a solution ? And these 4953 mosfet have 2 drain pins for taking voltage down to earth as i looked at the pinouts they have 2 diods to stop unused voltage leaking back on theses ic can we joint 2 transister together and put across all 4 pins rather then 1 transister on 2 pins each in series rather then side by side FDS4953 Dual 30V P-Channel PowerTrenchÒ MOSFET General Description This P-Channel MOSFET is a rugged gate version of Fairchild Semiconductor’s advanced PowerTrench process. It has been optimized for power management applications requiring a wide range of gave drive voltage ratings (4.5V – 25V). Applications • Power management • Load switch • Battery protection Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Ps dont fart on apple store Because its got no windows Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted August 22, 2016 Author Content Provider Share Posted August 22, 2016 P4 3x 100k ohm resister on the postive Done the trick and a rewire Brown.black.yellow.gold much easyier fix no soldering check last picture Verible resisters pods hardware hack on the hub 75 for each r.g.b inputs may help this on g1 g2 r1 r2 b1 b2 they are the colour input pins thats what missing on the shields one for each colour not sure if the hub75 is power driving or signal but changing the pot may take the green colour down How could a potentiometer in the digital signal lines reduce the power levels of the leds ? Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Check this out intresting put one green hub 75 cable on the negative side and got a really bright out put and lucky1 if you put these resister across it would because the panels are getting power thought the hub 75 for some reason i wired some white leds on the 3rd hub 75 output and i also looped it back from a earth from the stm32 hub75 potentiometer can alternative voltage amplifie sound amps ect i like the funky new palets green and blue yellow i got rid of the green bleeding but had reds instead Link to comment Share on other sites More sharing options...
Content Provider UncleSash Posted August 22, 2016 Content Provider Share Posted August 22, 2016 Can you make a Schematic please? It looks like that i be in London for 2 nights (next sunday till tuesday) Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 My pcb schematic and if the hub 75 cable is + red +blue +blue and 3 earths - Then lucky1 this could be a future fix adding 6 extra mosfet i did test the pins on the cable with a electronic digital meter and it gave me silly results but 3 earth for 6 rgb inputs Thanks Paul Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted August 22, 2016 Author Content Provider Share Posted August 22, 2016 Paul, to be honest, I think you have no idea what you are doing. Putting variable resistors in a digital signal line going to a shift register?? This no analog lamp matrix like in pinball machines. Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 We can only try lucky1 or prehapes on the mosfet chips some how Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Sm7 x2 then Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Transister pnp and npn switch voltage the 555 timer switches led lights on and off Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 So how do you add some hardware to the stm32 controller to change each data flow brightness on each colour Link to comment Share on other sites More sharing options...
psmmacker Posted August 22, 2016 Share Posted August 22, 2016 Ok you say lucky i dont have a idear on what i am saying well answer this one why i getting voltage on the last panel of the 2 daisy chain of panels ? With out the red + and - negative from powerpack should there be voltage or signal line drive Link to comment Share on other sites More sharing options...
Content Provider lucky1 Posted August 23, 2016 Author Content Provider Share Posted August 23, 2016 The brightness of each color is controlled bei Pulse Width Modulation (PWM) of the display enable (OE) signal. The analysis and fix from Jann (Cynic) still seems to be technically the best from my side. Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 Pwm can only be software controlled rather then hardware let me research on how the earths work on the panels i am getting a pdf of the pcb layout soon from a ali express supplier Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 What about this simple circuit this is what i was saying about 555 timers which i would remove and use the other components for hardware controlled pwm Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 What about verible resister between controlled bei Pulse Width Modulation (PWM) of the display enable (OE) signal ok are the 3 gnd earths this made the panel bright when i earthed it to the power pack input and the oe signal controlling each r.g.b pin on the hub 75 cable the green dots are over voltage or signal interference see the 2 crystal timers on the stm https://m.youtube.com/watch?v=ww-BUQHYFrQ Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 Ready for soldering cant use my 30watt one might melt off the led as its a thin pcb Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 I am also good fixing ecu on cars engine controller units pc ect tv modding c64 tape decks had a dac converter analog to digital and vice visa and a Schmitt trigger 74ls ic i have 7 yrs it experience and 10 in electronics Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 Not unless the stm32 mcu is causing the noise signal on the output pin Link to comment Share on other sites More sharing options...
psmmacker Posted August 23, 2016 Share Posted August 23, 2016 What about 3 rgb pins on the left panel and 3 rgb on the right you have to bridge CLK OE LAT A B C D GND pins then you would not need the dasiy chain all together and split the 2 digital signals with 1 hub 75 from discovery stm 32 gio pins out to 2 hub 75 cables into each left input panel 1 and 2 i need someone to make ciruit diragram to built this cable i got the same bleeding on the both panels on the same place see pic 3 pic 4 are the 6 rgb inputs tied together can someone put the pin diragram on here so i can cross reference Link to comment Share on other sites More sharing options...
psmmacker Posted August 24, 2016 Share Posted August 24, 2016 Is this 2 pins or 1 on the transister fix ok it 2 pins on drain 1 and 4 yes 2.2 ohm ceramic transisters work as well red red red gold im also going to use wire glue on chips legs as i f@@ked up my p5 panel and all my panels 2.5 p3 p4 and p5 had green bleed not any other colours Link to comment Share on other sites More sharing options...
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