The USB mini-male has 2 types:
- Mini-A-male
- Mini-B-male
The USB OTG devices detect itself as a host or client depends on the ID pin(pin 4). USB Mini-A-male has internal wiring to tie the ID pin to GND, which let the host to identify itself as USB host.
While most of the USB Mini-male cable you see on the market is Mini-B-male, which leave the pin unconnected.
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