we are looking for expert guy from china, he will design a printed circuit board (PCB) to do work like usb hub with external power.
in the market there are alot of this type of device but we need some special requirements:
1. the pcb will be connected to a battery 5000mAh
2. the pcb will be connected to mobile using usb type c
3. the pcb will be connected to Flash Disk.
4. the charger will charge the battery and the mobile on the same time.
5. the battery will charge the mobile with predefined conditions ( Always, below 40% of mobile battery ) this feature require software to mange this.
6. the pcb contains LED lights for indicator to give status of the external battery ( low, charging, full)
7. important: the flash disk must work and we can read its content on the same time while the mobile is charging ( charging by the external battery or by the charger).
8. On/Off switch to disconned the usb connected devices, but keep the charging and battery connected and work.
1. the PCB will be connected to a mobile using type C usb, and this cable must be FFC cable.
2. the connection between the FFC cable and the PCB must be using connectors ( no soldering).
3. the flash disk, or any usb device will be connected using molex connection ( data + power)
the freelancer must have the ability to contact Chinese factories to bring the cables, connectors, batteries, and manufacture 3 samples of the PCB.
any question you can ask in messages