![]() When connecting the ttl device to the board follow this They dedicated an entire instructable to this module and it's worth the read! ![]() I covered the programming portion in my video but if you'd like more information on this module I recommend checking out this instructable. After opening the software and supplying power to the board the "red not connected" will turn green to show that the device is connected and now you can edit the contents of the module. In short, in order to program the module you will need to solder the ttl to usb device RX, TX and gnd wires to the correct pads on the board. On the Bluetooth board I included a RX, TX and TTL- pads for programming. The software can be downloaded from this step. You don't have to program the device in order to use it but if you'd like to program the module you will need a ttl to usb device and the programming software. The XS3868 can be programmed to change a variety of default settings. This project is opensource so if you run into any issues with the design please feel free to reach out to me. You can download the gerber files for this project here. The pads labeled 5+ and and 5- are for mounting a 5 volt input to charge the battery, the B+ and B- are for the battery, and the AL, AR and AG are the audio output pads for the 3.5mm jack. I included these pads in the schematic and board but didn't use them for my project but the option is there! The Bluetooth module can use switches to carry out commands such as skip, volume and pause. I used surface mount pads for every external connection to make the board as modular as possible to fit a wide variety of enclosures. I used the TP4056 IC for this, once the battery is charged its stored energy can be passed to the Bluetooth module portion by the use of the "S" pads which act as solder pads for an external on/off switch. ![]() I wanted this adapter to have the ability to charge a battery so it can provide power to the Bluetooth module. Since it doesn't require a lot of parts this allows for a small board. It can be broken down into two parts, the battery charging circuit and the Bluetooth module portion. The schematic behind this project is relatively simple.
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