Rappelbox Posted February 12, 2017 Posted February 12, 2017 This will over time surely kill your USB!I don't recommend powering such current hungry devices from a single USB connector. These panels draw a lot of juice and if your USB is not secured it will blow up.
psmmacker Posted February 12, 2017 Author Posted February 12, 2017 Already sorted add 2 x 5 volt usb my friend to my duel design and been running for 4 months no issues 1 usb to p4 panel 1 usb to p3 and stm32 discovery power for 5 volt gio pin for each p3
Rappelbox Posted February 12, 2017 Posted February 12, 2017 It's ok if your setup is working well but I don't recommend it for others.It makes no sense to save 10 bucks on power supply if you blow your USB port or your whole mainboard.
psmmacker Posted February 12, 2017 Author Posted February 12, 2017 7 hours ago, Rappelbox said: This will over time surely kill your USB! I don't recommend powering such current hungry devices from a single USB connector. These panels draw a lot of juice and if your USB is not secured it will blow up. 13 amps 5 volts the usb pull intotal from the power pack from a pc atx power pack and adding a protection fuse in the usb curcuit would help i agree i also tested panel with a 2 amp samsung mobile charger and that worked fine on 1 set of p3 along not unless you use the 5volt from a spear sata power output as they have 5volt + red and 12+ and 2 earths prehape a power curcuit could be adapted so there panels could be powered via pc aswell o
Content Provider lucky1 Posted February 12, 2017 Content Provider Posted February 12, 2017 Maybe it is good to mention that you already killed 2 of your controllers. Going on with experiments like this most likely will bring you the hattrick. The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected USB devices. A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0.
psmmacker Posted February 12, 2017 Author Posted February 12, 2017 Thats because i was messing with the hub 75 outputs it cooked my stm32 baords but i had this going for 3 months and its been ok so far I may us a sata 12 volt step down to 5 volt + regulator the ic chips only use 5 to 10 volts and i have test with a electronic meter and voltages are stable
psmmacker Posted February 12, 2017 Author Posted February 12, 2017 2 hours ago, lucky1 said: Maybe it is good to mention that you already killed 2 of your controllers. Going on with experiments like this most likely will bring you the hattrick. The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire to power connected USB devices. A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0. Hay lucky 1 is there a 12 volt to 3 and 5 volt regular as the sata idear would be a solution for vpinball and future pinball users
Sibi Posted February 13, 2017 Posted February 13, 2017 I use this cheap dc-dc convertors, and take supply directly from unregulated 12v on driver board. Not 12v for display (it goes true 7812) take it before 7812, there is 12vA (12v analog) test point on wpc boards.
psmmacker Posted February 13, 2017 Author Posted February 13, 2017 Ya something like thay would be good as i rather use a self power design from the same pc rather then a external power pack They not silent as you hear a capacitor noises and these ic regular are better for the voltage as it may be is smooth and much better for the rgb panels as power packs are switching Ive just powered a p3 set with a samsung s5 2amp 5volt charger and just powered the stm via plain usb Look how stable the panel is running under 2 amps max
Sibi Posted February 13, 2017 Posted February 13, 2017 I use it for real pinball. Did you measure how much amps when whole panel is on? Whole panel white and brightnes at max. I suppose it will be very close to 2amps.
psmmacker Posted February 13, 2017 Author Posted February 13, 2017 But if i use 1 postives from pc to panels and no gnd i get a ood singnal from the stm32 discovery but if i add the usb + - to panels from pc and from stm32 discovery on the of the gio pin i get interference
psmmacker Posted February 13, 2017 Author Posted February 13, 2017 Hay sabi i think they have used too many earths on the hub 75 aka gnd i think they only need 1 not 3 gnd as if you power the panels via usb i dont use the earth as the stm 32 discovery doing that via the stm32 discovery that via the usb and the iec cable is powring from as it contains data + and - 5volt plus and -5volts Whrere did u get the regular from as i colud invest in one them as that may power 2 duel display and share the voltages between them thats 2.5 volt at 5 amps each Now rapplebox and lucky 1 goe easy on me
Sibi Posted February 13, 2017 Posted February 13, 2017 First of all i dont like idea powering panels true usb. Thet isnt purpose of usb conector on stm. Also im not sure how much curent stm can hold true 5v lead (before pcb will burn) There is lot of them on alliexpres, look for step down or buck converter. I use this http://www.banggood.com/5A-75W-DC-DC-4V-38V-To-1_25V-36V-Adjustable-Step-Down-Converter-Module-p-917453.html They are good for 2-3 amps.
psmmacker Posted May 7, 2017 Author Posted May 7, 2017 On 2017-2-13 at 9:59 AM, Sibi said: First of all i dont like idea powering panels true usb. Thet isnt purpose of usb conector on stm. Also im not sure how much curent stm can hold true 5v lead (before pcb will burn) There is lot of them on alliexpres, look for step down or buck converter. I use this http://www.bagnogood.com/5A-75W-DC-DC-4V-38V-To-1_25V-36V-Adjustable-Step-Down-Converter-Module-p-917453.html They are good for 2-3 amps. sibi i like your sheld design any way of making me one whats your buck converter voltage out i know its 12volt in
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