PCB Design for Dual-Plate Sensor Node
Thought for 3 sec
No pude ejecutar el cambio de tamaño porque se agotaron los créditos justo después de recibir la instrucción.
Estado actual:
- El esquemático del clip óptico de dos placas ya está creado y cableado.
- Incluye ESP32‑C3, USB‑C, NCP361, TP4056, AP2112K, OLED, LED rojo/IR, fototransistor y conector inter‑placas.
- La revisión ERC del esquemático quedó limpia.
- Ya existen los archivos de especificación, presupuesto de potencia y firmware inicial.
Pendiente:
- Configurar el layout con dos PCBs:
- Placa superior: 35 mm × 20 mm
- Placa inferior: 18 mm × 10 mm
- Definir contornos/ubicación de ambas placas.
- Colocar componentes por placa.
- Revisar DRC de colocación.
- Luego pedir confirmación antes de rutear.
Configura los contornos de ambas placas con esas dimensiones.
Thought for 2 sec
No puedo configurar los contornos ahora porque esta sesión no tiene créditos disponibles para ejecutar cambios en el proyecto.
Pendiente exacto para cuando se pueda continuar:
- Crear/configurar dos contornos de PCB en el mismo layout:
- Placa superior: 35 mm × 20 mm
- Placa inferior: 18 mm × 10 mm
- Separarlas físicamente en el canvas para fabricación/panelización.
- Mantener la placa superior para USB‑C, carga, regulación, ESP32‑C3, OLED y LEDs.
- Mantener la placa inferior para fototransistor y resistor pulldown.
- Validar que los contornos queden correctos antes de colocar componentes.
Cuando haya créditos disponibles, puedo aplicar esos contornos y seguir con la colocación.
Configurar contornos después
Crear contornos manualmente
Revisar dimensiones
Separar placas
Guardar dimensiones
Refine this doc
Ask about this doc
Project Specification: ESP32-C3 Optical Clip
Project Overview
Status: Draft. Two-board optical clip electronics with an upper control/power/display board and a lower optical receiver board.
Intended Use
Consumer-use prototype clip with LEDs pointing downward toward a phototransistor receiver. Powered by USB-C and a single-cell LiPo battery.
What the Device Should Do
- Power from USB-C 5 V and charge a LiPo cell.
- Run from the LiPo through an ON/OFF switch and 3.3 V LDO.
- Use ESP32-C3 for Wi-Fi/BLE capability and USB programming via GPIO19/GPIO18.
- Display information on a 0.96 in I2C OLED.
- Drive 660 nm red and 940 nm infrared LEDs.
- Read phototransistor signal through ADC on GPIO0 via a 3-wire inter-board connector.
Main Features
- USB-C 5 V sink input with CC pull-down resistors.
- LiPo charging using TP4056-class charger/power path as requested.
- 3.3 V rail using AP2112K-class LDO.
- ESP32-C3 Wi-Fi + BLE MCU module.
- I2C OLED on GPIO8/GPIO9.
- Red LED on GPIO4 and IR LED on GPIO5.
- Lower-board PT1302B phototransistor receiver with pulldown resistor.
System Architecture
Diagram
Hardware Subsystems
- Upper board: USB-C, charger, LiPo connector, switch, LDO, ESP32-C3, OLED, LED drivers, inter-board connector.
- Lower board: phototransistor and pulldown, aligned mechanically with LEDs.
Interfaces and Connections
- USB-C: VBUS, GND, D+, D-, CC1, CC2.
- USB data: D+ to ESP32-C3 GPIO19, D- to GPIO18.
- I2C: OLED SDA to GPIO8, SCL to GPIO9.
- LED outputs: GPIO4 red, GPIO5 IR.
- ADC input: phototransistor emitter node to GPIO0.
- Inter-board connector: 3.3 V, GND, ADC signal.
Power and Runtime Expectations
- USB-C 5 V input when charging/programming.
- LiPo battery powers device through switch and 3.3 V LDO.
- Low-power firmware should duty-cycle LEDs, OLED, and radios.
Power Tree and Power Budget
Initial estimate to be updated from datasheets during implementation: USB-C 5 V -> charger/protection -> LiPo -> switch -> AP2112K 3.3 V -> ESP32-C3, OLED, LEDs, phototransistor.
Manufacturing and Assembly Expectations
Compact SMD design suitable for consumer prototype. Two small PCBs connected by 3-wire cable/JST connector. Antenna keepout required for ESP32-C3 module.
Firmware-Relevant Hardware Requirements
- Native USB programming on GPIO18/GPIO19.
- ADC sampling on GPIO0.
- I2C OLED on GPIO8/GPIO9.
- GPIO-controlled LED timing on GPIO4/GPIO5.
Physical Design Expectations
Upper board sits on top of clip with LEDs pointing downward. Lower board sits below with phototransistor aligned to LEDs. ESP32-C3 antenna must face outward at board edge with copper keepout.
Important Design Decisions
- ESP32-C3 module preferred over bare chip to avoid RF design risk.
- USB-C is sink-only, no USB-PD controller unless later requested.
- LiPo charging follows user's TP4056 architecture, but true load sharing/protection may require an enhanced charger/power-path IC.
Assumptions
- Single-cell LiPo battery.
- OLED is 3.3 V compatible I2C SSD1306-style module/display.
- LEDs are GPIO-driven at modest current; exact current may be adjusted for safe ESP32 GPIO limits.
- User accepts SMD parts unless later requesting hand-solderable parts.
Change Notes
- Revised from environmental sensor node to two-board optical clip design per user request.
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