Added Readme

Cacao.kicad_prl

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ReadMe.md

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+# Cacao - Multi-Channel Signal Acquisition Board
+
+Cacao is a compact 12-channel audio-frequency signal-acquisition board built around the RP2350. It explores how modern, accessible components can consolidate multi-channel acquisition, buffering, storage, and Ethernet communication onto a single 80 x 50 mm PCB.
+
+![Cacao PCB - 3D render](figures/Recto.png)
+![Cacao PCB - 3D render](figures/Verso.png)
+
+<!-- Replace docs/images/cacao-render.png with the final board render. -->
+
+## Overview
+
+Cacao was developed independently as a proof of concept alongside an industrial R&D internship. The project acts as a technical calling card: a complete architecture, schematic, and dense PCB layout designed to demonstrate what can be achieved with a modern microcontroller and cost-effective audio-conversion hardware.
+
+Twelve differential audio inputs are digitized by three TLV320ADC5140 ADCs at 44.1 kHz. The RP2350 collects and processes the resulting data before sending it over 100BASE-TX Ethernet through a W5500 or storing it locally on a microSD card.
+
+## Key Features
+
+- RP2350 in the 80-pin package with internal flash
+- 12 differential audio-input channels
+- Three TLV320ADC5140 four-channel ADCs synchronized by a 2.5 ppm clock
+- 44.1 kHz acquisition with planned 12- or 16-bit sample handling
+- W5500-based 100BASE-TX Ethernet output
+- 8 MB external RAM for acquisition buffering
+- MicroSD storage for standalone data capture
+- USB-C 5 V power input
+- 3.3 V buck supply for the digital electronics
+- Separate low-noise 3.3 V analog rail using an LP5907MFX-3.3/NOPB LDO
+- Four-layer, 80 x 50 mm PCB with more than 200 components
+- Components on both sides, with most passive components placed on the back
+
+The Micro-USB connectors are used as compact keyed connectors for the differential analog channels and their 5 V amplifier supply. They are **not USB data ports**.
+
+## Engineering Focus
+
+The principal layout challenge was integrating 12 analog channels, three synchronized ADCs, local buffering, storage, Ethernet, and the required power architecture within an 80 x 50 mm footprint. Particular attention was given to separating low-noise analog supplies from the general digital rail, maintaining clean reference and return paths, and placing a large number of passive components without increasing the board area.
+
+An alternative future configuration could replace the W5500 and external RAM with a W6300 connected through QSPI, reducing the number of separate devices while retaining high-speed Ethernet communication.
+
+The firmware will have to be as efficient as possible to allow 10-12 channels at the same time to be sampled and transferred to the W5500.
+
+## Project Status
+
+V1.0 is currently in production at Aisler.com and will be assembled by myself

~Cacao.kicad_pcb.lck

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+{"hostname":"Mac","username":"rohmermaxime"}

~Cacao.kicad_sch.lck

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+{"hostname":"Mac","username":"rohmermaxime"}