Arduino Nano (3.0) Use an USB Bluetooth stick

Question

I was thinking to build a very small USB Audio Streaming device with aux output for an amp (I know they already exist, but I like the self invention). So I bought an Arduino Nano and a USB Bluetooth device with was originally for a computer. But I thought I might use it on the Arduino. After I removed the housing and soldered four wires onto the USB plug:

https://www.dropbox.com/s/ye5vveb98sfz1zq/IMG_20161030_132648_01.jpg?dl=0

I needed to know how to wire them:

https://www.moddiy.com/product_images/uploaded_images/patillaje-conector-usb.jpg

So I connected:

• "1" to 5V+ on arduino
• "2" and "3" need to be connected to txd and rxd on the arduino (but I don't know whitch way around)... I read that I need to have 3.3v on "3" or the "+" wire but I have 5V Output on the digital Pins on the arduino (so I need some resistors, but I'm not familiar with calculating them).
• "4" to gnd

Can someone confirm and / or provide some information for me to get this thing running (Bluetooth device enabled and functioning)?

Further steps would be:

• coding the arduino to Use the Bluetooth module for audio streaming - preferrably three Channel.
• configure the arduino to give the stream to an amp.

I know my knowledge of electronics is not very good and I need some education. If you can provide some good learning websites - feel free to suggest.

Answer 1

Interfacing an Arduino with USB is already VERY hard. USB does not use the same Serial as protocol so don't connect it to Tx and Rx. The only way to interface an Arduino and an USB device is trough a USB shield, which is quite complex already.

Just for you information. USB uses 5V so no voltage divider is needed to reduce it to 3.3V. A voltage divider is pretty much 2 resistors in series where the original voltage goes in one end, the output voltages is between the 2 resistors and the other end is connected to ground. Read more about them here.

Now, communicating with Bluetooth is also complicated, but mix USB + Bluetooth and you get something ALMOST impossible (I hope the ALMOST is clear enough for any hatters). It is possible, but seeing you level of knowlage, simply don't risk having a severe depression trying to fingure it out!

In the end of the day, your plan of using that Bluetooth USB module is just going to be crazy complicated and big.

A more effective solution would be to use a module such as the HC-05 Bluetooth module. It is quite cheap if you get it from sites such as Amazon. Link here for this product on Amazon.com. It is designed with the Arduino in mind thus making programming easier. You project could also be a little smaller, because this module pretty much has the size of your Arduino Nano.

Hope it was helpful!