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Acquire all of the elements and instruments required for the venture earlier than beginning its meeting. These are listed within the two bins on your comfort and prepared reference. Significance of the elements is defined under.
Bluetooth MP3 participant with FM receiver module
That is the principle a part of the venture. The compact MP3 participant module with FM receiver, proven in Fig. 2, is available available in the market and through many e-commerce portals. It may be put in in your car, desktop PC audio system, house theatre system, or some other audio amplifier.
The IR distant management usually comes together with the Bluetooth MP3 participant module. However you too can use another IR distant to regulate this MP3 audio participant. The writer efficiently tried three completely different IR distant fashions, that are proven in Fig. 3.
Fig. 3: Widespread IR distant controls
You need to use any audio (energy) amplifier having a 3.5mm audio enter port.
5V DC energy provide (USB)
You need to use a 5V, 1A or 2A cellular charger.
It isn’t very important. As MP3 participant module doesn’t include antenna, you should use a whip antenna or a single-strand hook-up wire as antenna.
The venture requires a 3-wire cable for audio connection, a 2-wire cable for energy provide, and a type-A USB cable. You additionally want a 3.5mm stereo audio jack with cable for audio output connection to audio amplifier.
To make your individual cardboard cupboard, draw the required dimension for both sides of the cupboard on the cardboard utilizing a scale and pencil/pen. After reducing in response to the size proven in Fig. 4, place the entrance, rear, and sides on a cardboard of 8.5cm×14cm dimension. Repair both sides on the bottom utilizing glue gun.
Fig. 4: Writer’s cupboard blueprint
As might be seen from the highest view in Fig. 4, the cupboard has 4 sections or elements. On the left facet, there are two 4.25cm×2cm sections, that are for use for holding the USBs. These two sections assist in retaining the USBs in vertical place, in order that they are often picked up simply when wanted. The center part is for holding MP3 participant and the appropriate one is for holding the IR distant. All these might be seen within the writer’s prototype (Fig. 1). Subsequent, make two holes on the rear facet for connecting the audio and energy cables.
Fixing MP3 participant module within the cupboard
Earlier than fixing the MP3 participant module into the cupboard, look out for the antenna level and solder it to the PCB. The interior a part of MP3 participant module is proven in Fig. 5.
Fig. 5: Inner a part of MP3 participant module
Use an appropriate size (say, 10cm) of single-strand hook-up wire as antenna. The connecting level for the antenna within the MP3 module shouldn’t be clearly seen. Gap for soldering the antenna can be not supplied within the PCB. Nevertheless, when you look rigorously on the MP3 board on the opposite facet, you’ll be able to find the antenna level for soldering, as proven in Fig. 6. You’ll be able to solder the antenna wire right here utilizing a 25W soldering iron. All soldering work needs to be finished earlier than fixing the MP3 module within the cupboard.
Fig. 6: Antenna fixing
Earlier than connecting the audio and energy cables within the MP3 participant module, it is advisable join the audio cable to an audio jack and energy cable to a USB type-A cable for exterior connections. Subsequently, solder all of the cables to respective connectors, as proven in Fig. 7 and wrap them with cello tape, as proven in Fig. 8.
Fig. 7: Soldering the ability cable to a type-A USB connector
Connecting the cables to MP3 participant
The three-wire cable is used for stereo audio connections, the 2-wire cable is for energy provide connection, and the single-strand cable is for antenna. The within view of the writer’s prototype with numerous cables is proven in Fig. 9.
Fig. 8: Cables wrapped with cello tape
Notice that there’s a 4-pin prime entry header on the PCB of the MP3 module. However the module comes with a 3-pin wire for stereo audio connection. You must join it to first three pins of the 4-pin header from proper in direction of the 2-pin pink header connector for energy provide. The final pin is left unused, as proven in Fig. 9.
Fig. 9: Cable connections to MP3 participant module
Earlier than fixing the module to the cupboard, guarantee every thing is working correctly. Whenever you change the mode in IR distant, it ought to change to 5 modes one after the other: bt (Bluetooth), USB, FM, SD, and AUX. Testing Bluetooth operate within the MP3 participant module is proven in Fig. 10.
Fig. 10: Testing Bluetooth operate
Fixing MP3 participant within the cupboard
Fixing the MP3 participant module within the cupboard is a no brainer. From the entrance facet, insert the module into the 8cm×1.7cm slot reduce out within the cupboard. Repair it utilizing nuts and bolts. Join the cables contained in the cardboard cupboard, as proven in Fig. 11.
Fig. 11: Cables linked inside the cupboard
All of the cables might be prolonged to completely different factors from the holes supplied on the rear facet of the cupboard, as proven in Fig. 12. You’ll be able to connect with audio supply or amplifier by way of a 3.5mm multiport audio jack, as proven in Fig. 13.
Fig. 12: Rear facet of the cupboard
The whole meeting of the Bluetooth MP3 participant with FM receiver is proven in Fig. 14. The MP3 participant module might be powered by connecting it to a 5V DC USB energy provide. Its output might be linked to an audio amplifier or amplispeaker to start out listening to music. A small desktop stereo speaker system was used to check the prototype.
Fig. 13: Multiport audio jack
The MP3 participant module has USB and MicroSD ports to play MP3 information. Audio from cell phone or laptop computer might be listened to by connecting by way of Bluetooth. FM radio will also be listened to.
Fig. 14: Full meeting of Bluetooth MP3 participant and FM receiver
The MP3 participant might be managed utilizing IR distant or management buttons supplied on the entrance panel. It additionally has an AUX (auxiliary) socket, which might be plugged to a 3.5mm normal jack headphone connection.
Sani Theo, technical editor at EFY, is an electronics fanatic and circuit designer
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