Project Echo Schematic Design

flux

0:05

Work done
  • Created a high-level modular schematic for Project Echo with the main blocks: U1, U2, U3, U4, U5, U6, U7, U8, U9, U10, J1, and J2
  • Captured the top-level architecture in the project metadata and added project-level documentation for power requirements, connectivity, implementation scope, and naming conventions
  • Wired and labeled the core requirement nets: 12V, 5V, 3V3, GND, SPI_SCK, SPI_MOSI, SPI_MISO, RFID_RST, RFID1_SS, RFID2_SS, RFID3_SS, RFID4_SS, AUDIO_MODE_SEL, BT_L, BT_R, CHAR_L, CHAR_R, AMP_IN_L, and AMP_IN_R
  • Documented the Teensy control-pin assignment on U1, the Audio Shield placeholder assumptions on U2, the Bluetooth source assumptions on U7, the source-selection behavior on U8, the amplifier I/O boundary on U9, and the power-block scope on U10
  • Submitted a library coverage request for the Teensy Audio Shield Rev D because the current library entry is not usable as a schematic-level module
Success criteria review
  • ✅ All core system elements and interfaces are defined and documented in a requirements checklist
  • ✅ The schematic is partitioned into modular blocks with clearly labeled power rails and interconnections
  • ✅ Documentation now supports hand-off into detailed schematic design, including assumptions and deferred implementation details
Next steps The next step is to convert this architecture schematic into a detailed implementation: real Teensy Audio Shield interface wiring, regulator support parts, amplifier support circuitry, protection, and decoupling. If you want, I can do that next.
Create requirements checklist
Define inter-block nets
Set modular blocks
Add key assumptions
Include acceptance checklist
23 days
Sign up to send

To get started, talk to Flux or create a New Document.

Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    No assets added.

    Project Echo

    Project Echo thumbnail
    High-level modular schematic requirements for a Teensy 4.1 based RFID-triggered audio system with Bluetooth input, analog source selection, stereo amplification, and 12V to 5V power partitioning.

    Properties

    12V input rail feeds stereo amplifier directly and buck regulator input. Buck regulator creates 5V rail for controller-side power. Teensy 3V3 rail is distributed to RFID readers and SGTL5000 functional audio block. Common GND used across digital, analog, Bluetooth, and power blocks with star-ground intent.

    Shared SPI bus from Teensy to four RFID readers using SPI_SCK, SPI_MOSI, SPI_MISO, and shared RFID_RST, with unique RFID1_SS through RFID4_SS chip selects. Audio sources BT_L/BT_R and CHAR_L/CHAR_R feed stereo switch controlled by AUDIO_MODE_SEL, then route as AMP_IN_L and AMP_IN_R to the amplifier.

    Naming convention uses explicit rail and interface nets: 12V, 5V, 3V3, GND, SPI_SCK, SPI_MOSI, SPI_MISO, RFID_RST, RFID1_SS, RFID2_SS, RFID3_SS, RFID4_SS, AUDIO_MODE_SEL, BT_L, BT_R, CHAR_L, CHAR_R, AMP_IN_L, AMP_IN_R. TS3A5018 throw assignment and Bluetooth module supply rail remain flexible as long as source identity and rail partitioning remain explicit.

    High-level requirements-capture schematic only. Uses module-level or functional placeholder blocks to define power partitioning, shared SPI RFID architecture, analog audio source routing, and amplifier interfaces. Detailed passives, protection, decoupling, exact Audio Shield implementation, and final Bluetooth module supply selection are intentionally deferred.

    Diagram
    


  
    
  
  
    
  



""Power""


""Controller""


""RFID Subsystem""


""Audio Sources and Selection""


""Amplifier and Output""
























I2S and control

SPI SCK MOSI MISO RFID_RST RFID1_SS RFID2_SS RFID3_SS RFID4_SS

Shared SPI

Shared SPI

Shared SPI

BT_L BT_R

CHAR_L CHAR_R

AUDIO_MODE_SEL

AMP_IN_L AMP_IN_R
















12V Input
12V to node_5V Buck
12V Rail
5V Rail
3V3 Rail from Teensy
Teensy 4.1
Teensy Audio Shield
RFID Reader 1
RFID Reader 2
RFID Reader 3
RFID Reader 4
Bluetooth Stereo Receiver
TS3A5018 Stereo Switch
TPA3116D2 Stereo Amplifier
Left Speaker
Right Speaker

    Pricing & Availability

    Distributor

    Qty 1

    Controls