CERILUME LED Controller PCB Design
how many credits were used today
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I don’t have access to your account billing or exact credit/ACU usage totals from here.
What I can say:
- We used multiple AI design actions today: schematic edits, PCB placement, routing, DRC/manufacturing checks, BOM/MPN work, and file exports.
- The heavier credit/ACU users were likely the auto-routing runs and export/review steps.
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what size is the board
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The PCB is 90 mm × 70 mm.
That is approximately 3.54 in × 2.76 in.
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Power Budget — CERILUME Phase 1 LED Controller
Scope
This Phase 1 PCB is a low-voltage logic-only controller. It intentionally excludes LED strip/panel power, MOSFET switching, relays, fuses, buck converters, 12 V, and 24 V circuits.
Power Architecture
- Arduino Nano ESP32 ABX00083 is powered externally through its onboard USB-C connector.
5V_LOGICis sourced from the Nano ESP32VBUSheader pin. Per Arduino datasheet, the Nano ESP32 has no5Vpin; 5 V is available only onVBUSwhen powered via USB.3V3_LOGICis sourced from the Nano ESP32+3V3header pin.GNDis common across the Nano, WS2812/SK6812 data output, microphone header, LCD I2C header, level shifters, and test pads.
Loads
Table
| Rail | Load | Estimated Current | Notes |
|---|---|---|---|
5V_LOGIC | SN74AHCT125DR VCC | <1 mA static, small dynamic current | Used only as a WS2812/SK6812 data-level buffer; no LED power. |
5V_LOGIC | PCA9306 high-side I2C pull-ups and reference network | Low mA worst case during I2C lows | 4.7 kΩ SDA/SCL pull-ups plus 200 kΩ VREF2/EN pull-up. |
5V_LOGIC | External 20x4 I2C LCD backpack via J3 | Module-dependent, low-current accessory | Header supports the existing Cerilume LCD only; verify the Nano VBUS/USB adapter can supply LCD current. |
3V3_LOGIC | PCA9306 low-side I2C pull-ups | Low mA worst case during I2C lows | 4.7 kΩ pull-ups on I2C_SDA and I2C_SCL. |
3V3_LOGIC | Microphone header | Module-dependent | Header only; user must ensure microphone module is 3.3 V compatible and low-current. |
3V3_LOGIC | Nano GPIO A0/D7/A4/A5 interface | negligible | GPIO/control only. |
Design Limits
5V_LOGICand3V3_LOGICare explicitly low-current logic rails only.- LED strips or matrix panels must use a separate external high-current 5 V supply outside this PCB.
- LED data connector J1 provides only
LED_DATA_5VandGND; it does not provide LED power. - LCD connector J3 provides
5V_LOGIC,GND,LCD_SDA, andLCD_SCLfor a standard 20x4 I2C LCD backpack.
Datasheet Notes
- Arduino Nano ESP32 digital and analog pins are 3.3 V only.
- Arduino Nano ESP32
VBUSprovides 5 V only when the board is powered from USB-C. - SN74AHCT125 operates from 4.5 V to 5.5 V and accepts TTL-compatible input thresholds, suitable for translating Nano D7 3.3 V logic to a 5 V data output.
- PCA9306 is used for bidirectional I2C voltage translation between Nano A4/A5 at 3.3 V and the 5 V LCD backpack side. VREF1 is tied to
3V3_LOGIC; VREF2 and EN share a node pulled to5V_LOGICthrough 200 kΩ; SDA/SCL have pull-ups on both sides.
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