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Main => Builders Discussions => Topic started by: silverfibre on August 08, 2025, 05:32:05 AM
Hi all,
I recently bought someone's old A320 cockpit project. It was a bit of a mess, but I now have inputs responding in the SIOC software, and LED's switching on and off. However the 7-segment display it rather dead.
The 7-segment displays are connected to an IOCard Display, which is connected to a Master card, which is then connected to the USB Expansion card.
My question is, does the Master card need to be supplied by a separate 5v power supply to the two 5v pins? I presume the USB's 5v might not be enough to drive everything.
Hoping someone might now as this hardware is quite old now.
Thanks,
Rob
Yes, you need to supply power, the 5v over the USB is not enough.
Jason is correct, the USB port can only sustain a very small ammount of current. In fact connecting too many devices to a USB port can damage it permanently.
The point being that power supplies are so cheap these days it's not worth the risk.
Joe.