Bluetooth-enabled HiFi speakers

Projects General Guidance
1

Hi!
I'd like to add Bluetooth to my speakers.
I have an old Sony MHC-650
I also have a Raspberry Pi 4B 4Go, if that's easier to install (just heating too much - don't want some fans making noise)

I'd like to connect to my speakers even if they're on stand-by, and turning them ON just by connecting by Bluetooth, turning them OFF when disconnecting. The quality isn't a big priority, the input can be by CD (the reader is dead, so maybe if I can "emulate" it and have a digital input?), or by RCA (red and white old cables), even with a jack 3.5mm (the little one).
I need it to not overheat, no fans, a minimum quality, and not too expensive (100€ max).

Is a RasPi is more suitable? Will it be possible or not ?

Here the manual for it : https://servicemanuals.us/sony/audio/fh-b650-fh-b711-hcd-h650-mhc-650.html

Thanks !

2

For $25 usd you can buy a Bluetooth car radio that you can cast to. Put it in a wood case & it'll look like this:

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3

Very difficult project which needs a good bit of experience .
Think I’d sell it and buy a new Bluetooth device .

  • unless all you want to do it turn it off /on remotely by radio .
4

Thanks !

But that's not what I'd like to do. I already have an amplifier, and I want to reuse it.
I want to have a little module put in the case, so it's not apparent.

Yes, but that's an old one and getting enough to buy one that actually enables and disables when connecting/disconnecting could be way too difficult.

5

You need to buy a Bluetooth module and have a play with it to see if can do what you want .

It looks to be as though your just want to switch it on and off ( unsure ) not stream music or choose stored music. If so that might be relatively easy .
Have a google of “ Arduino remote switch Bluetooth “

You could also do it over a Wi-Fi connection, which might be easier still.

Have a look here

6

I already have one, but I always have to turn on the speakers, turn on the bluetooth module, get my phone, and launch music. Since I turn it on/off regularly, it can be annoying sometimes. And it needs to be charged, because it's on battery, and I cannot have it always on, cause it's forcing connection when it's disconnecting.

7

This has become a different question .

If the receiver is switched off and taking no power then you cannot remotely wake it up with a Bluetooth signal as far as I know .

8

No no, that’s the speakers that goes on stand by mode. The arduino or raspi doesn’t goes off, it keeps running to provide the Bluetooth signal and turn the speakers on.

9

Did you look at my link ?

Remote on/off switching is covered by lots of web sites and look at library examples too.
Switching on just when pairing is achieved might be a bit harder , but really only a button press away …

10

Hello,
Yes, I looked at your link. It's interesting, but I couldn't find a sequel to the article.
I'll describe more precisely what I'd expect :

  • The Arduino is always on and powered, it is broadcasting the Bluetooth.
  • Then, when the BLE module connects to a new device, the Arduino detects it and triggers the "Power" button, emulating a real press on the "Power" button by shorting it.
  • This makes the HiFi system to wake up, and receiving audio input via the RCA input from the arduino or BLE module.
  • Optionally, there's a cooldown for inactivity, powering off the HiFi system.

EDIT : Is it possible to send the signal to FM and plug the board in the antenna ?