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SqueezeAmpToo: an all-in-one audio sub-system

The SqueezeAmpToo is designed by Dave Viberg and Chuck Rohs and was completely inspired by the SqueezeAMP project and the SqueezeESP project.

While this project borrows a lot from the SqueezeAmp, it has some differences for both reduced cost and added functionality. These include:

The squeeze amp board is running in the box show below. To run this board, in particular the RGB LEDs and I2C buttons on the gpio expander, the SqueezeAmpToo Software should be used. This software is a fork of the SqueezeEsp project referenced above.

The RGB LEDS are illustrated in the animated GIF (it will only loop once in certain browsers, click on the image to see it in action if it isn't animating). This little box has 31 ws2812's (144 leds/meter density) along with the very nice/quasi expensive ssd1322 256 x 64 OLED. While the leds might be a little bit hokey, the center led changed color to indicate the battery voltage. This is all described in the Readme.

LED VU meters

Future Plans

We've got a PurePath Console Motherboard board on order, so we can use the onboard DSP of the TAS chip. This will allow us to stop messing with the equalizer running on the ESP and hopefully tune the stereos to get the most out of the speakers.

We've done some playing around with a mono version of the board. It is easy to hack to make it work that way, but again, the purepath software is probably required to do a proper job of it.

Doc Packages,Gerbers, BOM, and Software

We're using Protel 99SE for schematics and routing. The current version, V2, files are here, use at your own risk, we have not yet done a board run on these files. Also if you use them, please give credit to Dave Viberg, Chuck Rohs, and philippe44 from whom we leveraged the initial schematics. Standing on the shoulders of giants and all that....

V2 SqueezeAmpToo Doc Package

V4 DaughterBoards Doc Package

The CAM PACKAGE is here.

The BOM is here. Note however this is the V1 BOM. It does not contain the daughterboard parts, But should get you started.

As stated above Software is here and here.

Errata

The pinouts for the IR receiver are wrong. Pins 2 and 3 are transposed.

History

This project started out from experimenting with the squeezeamp software. I first got it working with a HiFiBerry clone. From there it got out of hand and we started building hardware and modifying software and ended up with the current generation board.

HiFiBerry Prototype

This design was prototyped using the squeezelite-esp32 code on a WROVER board that was fly-wired to a clone of the HiFiBerry AMP+. This audio board uses the TAS5713, and as such an appropriate driver needed to be written to use the squeezelite-esp32 code. That is now all ancient history but the picture and development is documented here for posterity (covered in CNC router dust):

alt text

For anyone else wanting to replicate this configuration, The WROVER is hooked up to the HiFiBerry as follows:

WROVER Pin#HiFiBerry 40pin connector numberFunction
840I2S-SD
912I2S-CLK
1035I2S-LRCLK
115I2C-SCL
123I2C-SDA
16GND

Depending on your dev board, you may be able to pull power from the pi amp, but I would recommend separate power supplies, and just tie the grounds together.

As of this writing sle118's repo contains the TAS5713 driver I developed. To test this out I used the sdkconfig "SqueezeAmp8MBFlash-sdkconfig.defaults". The code here was modified to replace "CONFIG_DAC_CONFIG" with "NULL" so that the dac_config NVS parameter would not be overridden.

The dac_config was set to:

Also note that the partition map needed to be changed so that the OTA application resides at 0x160000.

Squeeze Amp Too V1 Prototype

Since then, the V1 squeeze-amp-too has been built, and while there are a few errors, it performs remarkably well. The (modified for mono) V1 board is pictured here:

alt text

It includes the following:

Connectors:

What can it do

With the squeezelite-esp32 software, you can (as quoted from the SqueezeAMP)