TouchOSC XY Controller
Thought
Ich route zuerst das USB-Differenzpaar und die kompakte Buck-Leistungsschleife, lege anschließend die Masse-/Versorgungsführung an und route danach alle übrigen Netze. Abschließend behebe ich Routing-Anomalien und prüfe die vollständigen DRC-Ergebnisse.
Worked
Der Haupt-Routinglauf ist abgeschlossen; übrig sind ausschließlich sechs USB-Verbindungen zwischen den doppelten USB-C-Pads, dem ESD-Schutz und dem ESP32. Ich schließe diese jetzt gezielt mit schmalen, impedanzgerechten Leiterbahnen und prüfe danach alle Kupfer- und DRC-Regeln.
Worked
Die Platine ist vollständig geroutet: USB, Buck-Leistungsschleife, Stromversorgung und Masseführung wurden priorisiert, danach alle übrigen Signale. Es bestehen keine Airwires, offenen Leiterbahnstummel oder DRC-Fehler.
Offener Fertigungspunkt
- Für die generischen Widerstände, Kondensatoren und den Joystick-Header müssen vor der Bestellung noch konkrete Herstellerteilenummern festgelegt werden.
Empfohlene nächste Schritte
- BOM mit konkreten MPNs vervollständigen.
- Silkscreen und Beschriftungen bereinigen.
- Fertigungsdaten erzeugen und Board-Bring-up vorbereiten.
BOM und Silkscreen
Fertigungsdaten erzeugen
Bring-up Ablauf prüfen
BOM Kosten prüfen
Refine this doc
Ask about this doc
Project Specification
Project Overview
- Status: Review — schematic complete and ERC clean
- USB-C-powered physical XY controller using an ESP32-S3 and Wi-Fi OSC/UDP output for TouchOSC.
Intended Use
- Professional first assembled prototype for desktop/studio control.
- Powered and programmed through USB-C; operational control data is transmitted over WLAN.
What the Device Should Do
- Read two analog joystick axes and a joystick press switch.
- Read two additional momentary function buttons.
- Send normalized XY values and button events as OSC messages over UDP.
- Provide power and firmware-controlled WLAN/status indication.
- Support native USB flashing/debug and manual BOOT/RESET.
Main Features
- ESP32-S3-WROOM-1-N8R2 module with integrated PCB antenna.
- External joystick-module connector: 3V3, GND, X, Y, SW.
- Native USB 2.0 device interface on GPIO19/GPIO20.
- USB Type-C sink configuration with independent 5.1 kΩ CC pull-downs.
- USB data and VBUS ESD protection.
- 5 V to 3.3 V synchronous buck regulator.
System Architecture
Text
USB-C -> VBUS/Data ESD -> 5 V rail -> 3.3 V buck -> ESP32-S3 D-/D+ -----------------------> native USB Joystick header -> ADC RC filters / digital input -> ESP32-S3 -> Wi-Fi -> OSC/UDP Buttons / LEDs -----------------------------------> ESP32-S3
Hardware Subsystems
USB and Protection
- GCT USB4215-03-A USB 2.0 Type-C receptacle.
- CC1 and CC2 each use 5.1 kΩ to GND.
- USBLC6-2SC6 protects D+ and D−.
- ESD5341N protects VBUS.
Power
- AP63203WU-7 fixed 3.3 V, 2 A synchronous buck.
- Datasheet network: 10 µF input, 3.9 µH shielded inductor, 2 × 22 µF output, 100 nF bootstrap from BST to SW.
- EN tied to protected 5 V input for automatic startup.
Compute and Wireless
- ESP32-S3-WROOM-1-N8R2, 8 MB flash and 2 MB PSRAM, integrated antenna.
- 3.3 V local 100 nF plus 22 µF bulk decoupling.
- EN: 10 kΩ pull-up, 1 µF to GND, RESET switch to GND.
- GPIO0: 10 kΩ pull-up, BOOT switch to GND.
Inputs
- External five-pin joystick header used because it provides a clear, serviceable interface to common 3.3 V joystick modules.
- X -> GPIO1 / ADC1_CH0 through 1 kΩ + 100 nF RC.
- Y -> GPIO2 / ADC1_CH1 through 1 kΩ + 100 nF RC.
- Joystick SW -> GPIO4, active-low, external 10 kΩ pull-up.
- Function buttons -> GPIO5 and GPIO6, active-low, each with 10 kΩ pull-up.
Indicators
- Power LED from 3V3 through resistor to GND.
- Status/WLAN LED controlled by GPIO7 through resistor.
Interfaces and Connections
Table
| Interface | Signals |
|---|---|
| USB-C | VBUS, GND, CC1, CC2, USB_D−, USB_D+ |
| Joystick | 3V3, GND, JOY_X, JOY_Y, JOY_SW |
| Native USB | GPIO19 = USB_D−, GPIO20 = USB_D+ |
| Wi-Fi | Integrated ESP32-S3 PCB antenna |
Power and Runtime Expectations
- Bus-powered only; no battery.
- Designed to remain below the USB default-current envelope in normal use.
Power Tree and Power Budget
Table
| 3.3 V load | Typical | Peak |
|---|---|---|
| ESP32-S3 Wi-Fi | 250 mA | 500 mA |
| Joystick + pull-ups | 5 mA | 5 mA |
| LEDs | 5 mA | 10 mA |
| Margin / leakage | 10 mA | 20 mA |
| Total | 270 mA | 535 mA |
At 90% converter efficiency, estimated 5 V input is about 198 mA typical and 392 mA peak. The 2 A regulator provides substantial transient margin. Linear dissipation at the peak would be
(5 − 3.3) × 0.535 ≈ 0.91 W, so a small LDO was rejected in favor of the buck regulator.Manufacturing and Assembly Expectations
- SMD professional assembly; 0603 passives generally, 0805/1210 where capacitance and DC-bias margin require it.
- Shielded power inductor with 3.9 µH, Isat ≥ 2.5 A, Irms ≥ 1 A, low DCR.
- ESP32 antenna keepout must be honored during PCB layout.
Firmware-Relevant Hardware Requirements
- PlatformIO Arduino framework.
- Native USB enabled for flashing/serial where supported.
- ADC calibration/deadzone and debounced active-low buttons.
- Configurable Wi-Fi SSID/password and OSC target IP/port.
Physical Design Expectations
- USB-C at a board edge; ESP32 antenna at a board edge with copper/component keepout.
- Joystick header and user buttons remain accessible.
Important Design Decisions
- Buck regulator selected for thermal margin and Wi-Fi current peaks.
- GPIO1/GPIO2 selected for joystick ADC because they are ADC1 channels and are not ESP32-S3 strapping pins.
- GPIO3, GPIO45 and GPIO46 are intentionally not used for controls.
- GPIO35–GPIO37 are avoided because this N8R2 module variant may reserve memory-related pins; GPIO19/GPIO20 are reserved for native USB.
Assumptions
- External joystick module operates from 3.3 V and its X/Y outputs do not exceed 3.3 V.
- OSC recipient is on the same IP network.
- No USB Power Delivery is required.
Change Notes
- Initial architecture, component direction, GPIO map and power budget established.
- Completed 34-component / 23-net schematic with USB-C protection, AP63203 buck, ESP32-S3, joystick filters, controls and LEDs.
- ERC/passive/component review completed with no open warnings or errors in the checked categories.
- Open sourcing item: replace the generic 3.9 µH inductor representation with a locked shielded production MPN before procurement.
Project Overview
Intended Use
What the Device Should Do
Main Features
System Architecture
Hardware Subsystems
USB and Protection
Power
Compute and Wireless
Inputs
Indicators
Interfaces and Connections
Power and Runtime Expectations
Power Tree and Power Budget
Manufacturing and Assembly Expectations
Firmware-Relevant Hardware Requirements
Physical Design Expectations
Important Design Decisions
Assumptions
Change Notes
