DIY

Audio glasses with built-in Bluetooth

Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth These audio glasses are Hollow-frame glasses that fit the Bluetooth headphone circuitry. Thus, the user can listen to music wirelessly.
This is a replica of Bose audio glasses for $ 200 or less, made in China (link).
Tools and materials: -Connecting wires; -Headphones; -Resistor 150 Ohm – 2pcs; -Resistor 3,3 kOhm; -PAM8403 sound amplifier board; -Bluetooth audio module; -Charging module TP4056 with protection;
-Lithium polymer battery with a capacity of 300 mAh;
-Slide switch; -Heat shrink tube; -Pin connector; -Soldering accessories; -3D-printer;
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Step one: about components
1) Charging module:
TP4056 works as a charging module and connects to the battery via B + and B-. The output pins of the charging module (OUT + and OUT-) are connected to the Vcc and ground pins of the Bluetooth module and the audio amplifier.
Since the glasses are wireless, they must have a rechargeable battery and therefore also require appropriate circuitry to safely charge and discharge the battery. which is what the TP4056 module does.
The TP4056 board also has a protection function that prevents the battery voltage from being too high or too low.
2) Bluetooth audio module:
The bluetooth module allows a device (phone/laptop/tablet) to connect to the glasses wirelessly via bluetooth.
It has a Vcc and grounding pin for power and 3 output pins corresponding to the left earphone, right earphone and grounding. These three pins are connected to the audio amplifier to amplify the signal.
After turning on the Bluetooth audio module, it should be displayed in the Bluetooth devices of the user's phone as 3.0 BT or VIRE BT.
3) Audio amplifier:
The PAM8403 board is arguably the cheapest and most efficient audio amplifier board. It has three input pins, which are connected to the three output pins of the Bluetooth module. It also has 4 output pins, two for each speaker/headphone corresponding to the left and right side.
The audio amplifier also has Vcc and GND pins for connecting to the power supply.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Step two: scheme
1) The switch is used to turn the main circuit power on and off. This is to save power when the glasses are not in use.
2) Two headphones are connected to the PAM8403 board. Left and right side. Each earphone has a positive and negative lead.
3) The PAM8403 board and Bluetooth audio module are connected in parallel to the TP4056 output. This is necessary in order for both boards to receive sufficient voltage.
Audio glasses with built-in Bluetooth Step three: installation
Makes parts installation. Solder the red battery wire to B + of the charging board, black to B-.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth By default, the TP4056 board will charge the battery with a current of 1A. However, this amperage is too high for a small 300 mAh battery. Therefore, it is necessary to reduce the charging current.
If you do not reduce the charging current, it can lead to excessive heating of the Li-po battery or even an explosion.
The charging current can be reduced by changing the value of the resistor R3 on the board. This resistor is also called Rprog in the technical data. The resistance is usually 1.22 kΩ. It needs to be changed to a 3 kOhm – 4 kOhm resistor.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Using pins, solders the bluetooth module to the amplifier board.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth With the help of a jumper connects the Vcc/Vin contacts and the ground of the boards.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth TP4056 and battery will close to your right ear and the Bluetooth and audio board close to your left ear. Therefore, it is necessary to make two long wires so that they can carry power (Vcc and GND) from one end of the case to the other.
Cut one of the jumper cables in half and make two sets of wires. Each set contains two whole wires and one wire cut in half. Each wire should be approximately 18 cm.
Wire ends should be stripped. Then solder the ends of the wires together in each set. The result should be 2 wires approximately 45 cm long each. (18+ 18 + 9)
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth The circuit has a switch to turn the circuit on and off. You need to solder a short wire (8-10 cm) to the middle pin of the slide switch. Then solder the long wire prepared in the previous step to any of the remaining switch pins.
The second long wire, prepared in the previous step, is soldered to the OUT + TP4056 pin.
And one more short wire is soldered to the OUT-pin TP4056.
 Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Then solder the positive wire to the Vcc pin of the audio amplifier module, and the negative wire to the GND pin of the module.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Sound amplifier is designed for large speakers. The board provides 3W for each side of the speaker/headphone. That's too much for much smaller headphones.
The issue can be resolved by soldering a resistor in series with the headphones to reduce the power delivered to the headphones. The resistance value, which the master found optimal, is somewhere in the range of 100-150 Ohm.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Now you need to prepare the headphones.
You need to cut the cables of the individual headphones as shown in the photo. One side should be short (~ 10 cm), the other should be quite long (~ 45 cm) as it should go from one end of the glasses to the other. Using wire cutters, cut off the plastic sheath around the headphone speaker.
The ends of the headphone wires must be stripped off. Colored cable (red/blue) is positive, unpainted cable (copper) is negative.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Next, you need to solder the negative wire to the negative terminal of the audio amplifier output. The positive wire must be soldered to the other leg of the 150 ohm resistor. The same should be done on the other hand.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Installation is completed. < br> Audio glasses with built-in Bluetooth Step four: designing glasses
The frame of the glasses will be 3D printed. To develop the design of the frame, the master uses the Onshape program.
Glasses consist of three parts, the frame and two inserts covering the channels. The dimensions of the glasses are 50mm * 165mm * 185mm.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Step five: 3D -Print
Next, the wizard proceeds to print the details. It took about 6 hours to print the frames and 1.5 hours to print the inserts. The total printing time was approximately 7.5 hours. Print temperature: nozzle – 210 ° C, bed 60 ° C.
Print files can be downloaded below.
Part Studio 1 – Part 12.stlPart Studio 1 – Part 10.stlPart Studio 1 – Part 8.stl < br> Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth After printing, you need to process details.
 built-in Bluetooth Audio glasses with built-in Bluetooth Step six: assembly
Now you can start assembling the glasses.
The TP4056 board and a lithium polymer battery are installed in the right arm. A speaker with a long wire is installed in the same bow, in the place where the grill is located.
A switch is installed next to the earphone. If it is 6mm wide, it should fit snugly into the bore. The wires should go under the switch. Thus, 3 wires come out on the right side of the earphone: Vcc, GND and the right earphone.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Install in another bow audio amplifier, bluetooth module and a second speaker.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Fixes everything with hot glue.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth The last operation is to glue the inserts. The left insert is glued entirely, the right one must be cut in the place where the switch is installed.
Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth Everything is ready.
Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth  Audio glasses with built-in Bluetooth Audio glasses with built-in Bluetooth  m Bluetooth

Source:

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