I am new to circuits and electronics.
I was building a portable mobile charger(Battery Bank) an had to connect a USB port.
The tutorial I was watching had 2 wires , Red for +ve and White for -ve.
The USB connector I have has 4 wires , Green , Yellow , Blue and Black.
Can you help tell me which one +ve and which one is -ve.
It would be of great help !
Thanks !
Colour coding of wires on USB connector
usb
Related Solutions
The cable colours will vary from cable to cable. Use a continuity checker or ohmmeter to determine which wire is connected to which pin on the plug.
It's easy to just test the connectivity from the pins on the connector-end of the cable to the bare wires at the other end.
Even a hardware store multimeter is good enough for this test.
Disconnect the cable at both ends. Set your meter to the ohms function.
Touch one probe of the meter to one pin of the connector. Touch the other probe to one of the wires. If the wire is connected to the pin, you'll see (near) zero ohms. Depending on your meter you might also get a beep for continuity.
The pin assignments for the connector are readily available. Here's a picture from Wikipedia:
If your connector is a mini or micro type, those pinouts are also available from the Wikipedia article on USB.
Best Answer
Beyond red and black (and even then not all the time - sometimes black is hot and not ground) there are no standards. If it's cheap USB cable you are not even guaranteed the same coding between batches - the machine that makes the cable doesn't care what colour is in spool #2.
If you are buying a USB cable and cutting the B end off, your options are limited to getting a multimeter and checking the continuity. Every time.
Electronics supply shops just might have breakout cables available - A-connector on one end, red and black tinned leads on the other, ready for assembly.