This solution may not be a perfect power source because computer USB port power can vary widely, and of course, any attached hardware will also draw from this power source, but this approach can do the job in some scenarios.
Ọ bụghị ike zuru oke dị ka ike kọmputa USB nwere ike ịdịgasị iche iche, na, n'ezie, ngwaike ọ bụla nwere ike ịbịpụta site na isi iyi a, mana ọ nwere ike ime ọrụ ahụ na ihe ụfọdụ.