# Portable Speaker v0.1 - 'sound-blocks' - Overview


## Brief

Design notes about a portable speaker using small scale plastic processing machines, Lab/Fab-Lab grade appliances or 3D-Print.

## Goals (unconfirmed)

1. Modular, eg: power pack, dedicated I/O Module, ...
2. Outdoor , IPX6+ grade (waterproof) | 'beach-proof' ?
3. Accessible world-wide

tbc


## Material Options

Currently, we're still looking into common industrial waste as 

1. [PE500](https://www.techplasty.com/material/polyetylen/pe500-polyethylene-500), providing wear resistance
2. PP/HDPE

tbc...

## Essential Features

1. Standard: Bluetooth, Airplay, SpotifyConnect
2. Powerbank 
3. Extension slots/interface for additional modules, incl. additional power modules
4. Replacable battery
5. Basic audio hardware, AUX-IN and AUX-OUT (loop/daisy-chain)
6. Microphone - IN

tbc...

### Optional features / modules (ideas)

1. flexible flash-light/LED, perhaps attached on a telescope
2. walkie talkie 
3. speaker meshing (multiple speakers, synchronized) - needs research on BT-5 and 2.4/5 GHz
4. extensible I/O module: eg: addtional line-out/in routing
5. stream to head-phones
6. DLNA, perhaps internal storage as well - possibly a core feature ...


## References

### Other projects

- [OtterCastAmp - OS Amplifier](https://github.com/Ottercast/OtterCastAmp)
- [balenalabs - an RPI based multi-room cabable router ](https://sound.balenalabs.io/docs/)
- [Small OS speaker](https://stroem.readthedocs.io/en/latest/)


### Bluetooth

- [Official specs and resources](https://www.bluetooth.com/bluetooth-resources/bluetooth-5-go-faster-go-further/)
- [BLE-Meshing - Forum post](https://devzone.nordicsemi.com/f/nordic-q-a/47491/is-ble-mesh-capable-to-transmit-audio)

### Airplay

- [Wikipedia](https://en.wikipedia.org/wiki/AirPlay)


## Components (research)

### BT / 2.4Ghz related
- [BT to 30W speaker - Ebay - 25Euro](https://www.ebay.co.uk/itm/254702205110?chn=ps&mkevt=1&mkcid=28)
- [AliExpress - 9 Euro: nRF52833 2.4GHz BlE5.1 Bluetooth Mesh Wireless Audio Module Zigbee E73](https://www.aliexpress.com/item/1005003286650953.html?gatewayAdapt=glo2esp)
- [nRF52832 SoC - Chipset - Blogpost 'Nordic-powered wireless audio transmitter can be paired with up to 100 sets of headphones'](https://www.nordicsemi.com/News/2022/04/Avantree-audio-solution-Quartet-employs-nRF52832-SoC)
- [nRF52832 - Brief Spec - PDF](https://www.nordicsemi.com/-/media/Software-and-other-downloads/Product-Briefs/nRF52832-product-brief.pdf?la=en&hash=2F9D995F754BA2F2EA944A2C4351E682AB7CB0B9)
- [nRF5 SDK - Tutorial for Beginners Pt 1 @ Youtube](https://www.youtube.com/watch?v=jtTWnIxVDXs&list=PLiKJljyEUlZj4z8RqJKTaoMpSqjLdBGO4)


### Nordic

- [Technical Documentation](https://www.nordicsemi.com/Support/Documentation)
- [Voice Input Module](https://infocenter.nordicsemi.com/index.jsp?topic=/struct_refdesigns/struct/refdesigns_voice_input.html)

tbc



### Speaker

- [40W @ madridhifi.com ](https://www.madridhifi.com/p/beyma-4fr40-8-oh-altavoz)

### Air / Connectors / Modules

- [AudioCast multi-room module](https://audiocast.io/)

tbc

## Variants

###