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I have a USB 2.0 signal cable without power. (connects the piano with the tablet).

These are my ports / terminals:

  1. male, USB 2.0, type A (end of piano midi cable, without power, only signal)
  2. female, USB 2.0, type Micro-B (tablet input)

I have a cable connecting both of the above terminals.

Problem: the tablet doesn't charge. I want to add power to this cable so that the tablet will charge while it's connected (and it's almost all the time).

What to buy?
(I combined with various cables and adapters, and the effect is that there is either power or signal)

zx485
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Geri
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2 Answers2

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I want to add power to this cable so that the tablet will charge while it's connected

I would insert a powered USB-hub between MIDI-keyboard and tablet.

The problem may be that neither the MIDI-keyboard nor tablet consider themselves as host devices responsible for providing power or that the tablet requires more power than the original 5V x 500mA standard provides for - the tablet may be unable to negotiate a higher power.

Check the current or wattage rating of the power-supply (wall-wart) provided by the tablet maker.

The USB 3 standard has specific provision for higher power devices and so, if your tablet is USB 3, it may be beneficial to use a powered USB 3 hub between MIDI-keyboard and tablet. It won't hurt to try.

RedGrittyBrick
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You are looking for a device (adapter) called "accessory charger adapter". See also this answer. The device/cable has special value of resistor on micro-USB ID pin. It might work assuming your tablet supports the accessory charger mode.

Ale..chenski
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