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
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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.
Project Overview
Intended Use
What the Device Should Do
Main Features
System Architecture
Hardware Subsystems
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
