Firstly I am not sure if this is correct forum, but its only one related with hardware...
I has built my own emergency charger powered with solar energy.
It can provide 5V with 2A max. (about 10W) and provides two USB ports for devices.
Althought I dont have any phone/tablet with USB OTG (Host) function, I d like to prepare it to provide all this functions:
- charge two client devices
- charge two host devices
- charge one host and one client device
But, there is one problem with power - some OTG devices provides power, and some not.
Thats the thing, why I am asking - if both chargers connectors are powered and one host device is connected in it there will be a power collision - on one wire will be 5V from both sides - from e.g. phone and from charger. This will surely damage the phone because of shortcut.
I am right? Or, is a hosts power enabled, only, if there is not any external power plugged?
Hope, that anyone will understand, I can also provide a schematics later it it could help
Thanks anyone !!!