Hi, Im new to this forum. Based in Dublin, Ireland.
Im building a mobile phone charging unit to bring to outdoor festivals. Phone charging for about 800 phones. I bought usb hubs with 24 usb outlets. These are self powered and for most phones that works great.
Problem is that the iphone needs a usb input signal to hub from a pc to work. other than having to bring about 4 pcs (127 max usb to pc). I trying to find a workaround for the hub.
I found a couple of sites that said that if i split the input usb lead the pinouts should read 1=5v, 2=data, 3=data, 4= ground.
That i need to add +5v to 2 using a 49.9k R3 and 75k R4 resistors
And +5v to 3 using 75K R2 and 49.9k R1
and ground both 49.9k resistors.
This will send 2v to both data cables into hub and should fool hub into thinking it is connected to pc.
Im not sure if this will effect other items connected to hub or will just tell hub to output full 500ma charge.
Appreciate any help out there.