Diseño de Schematic y Conectividad
Thought for 7 sec
I’ll add an ESP32 NodeMCU module as the external UART endpoint, move the existing PA9/GND connections from the simple header to it, then switch to schematic view and tidy the schematic layout for readability.
Worked for 45 sec
No encontré “ESP32 NodeMCU” exacto; usaré el ESP32-DEVKIT-V1 disponible como módulo ESP32 externo equivalente, con GPIO4 y GND accesibles.
Worked for 1 min 47 sec
Added the ESP32 external module as U3 (ESP32-DEVKIT-V1), connected Nucleo PA9 → U3 D4/GPIO4, and tied both ESP32 GND pins to the common GND net. I also removed the temporary 2-pin ESP32 header and updated the firmware notes to reference U3.
Open items
- I could not continue with schematic-view switching/reorganization because your account currently has no available ACUs, so AI execution is paused.
- The exact “ESP32 NodeMCU” part was not available; I used the available ESP32 DevKit-style module.
Next steps
- Add ACUs, then ask me to reorganize the schematic visually by functional blocks.
- Run ERC again after cleanup.
- If you need the exact NodeMCU footprint/module, we can import or create that component.
Create NodeMCU component
Run ERC check
Add ESP32 TX return
Find schematic view
Refine this doc
Ask about this doc
Firmware Getting Started — Monitoreo de Corriente
Pin mapping
Table
| STM32 Nucleo-F446RE pin | Peripheral | Connected net / device | Notes |
|---|---|---|---|
| PB8 | I2C1_SCL | I2C_SCL: OLED1 SCL, U2 SCL, R3 4.7k pull-up | Shared I2C bus |
| PB9 | I2C1_SDA | I2C_SDA: OLED1 SDA, U2 SDA, R4 4.7k pull-up | Shared I2C bus |
| PA0 | ADC input | ADC_OFFSET_SCT | 1.65 V biased SCT-013 signal midpoint |
| PB12 | GPIO/EXTI | LOGGER_TRIGGER | Active-low button to GND, 100 nF debounce |
| PA9 | USART1_TX | UART_TX_ESP32_RX | To ESP32 DevKit U3 GPIO4/D4 RX input |
| GND | Ground | GND | Common ground with ESP32 and peripherals |
| 3V3 | Power | 3V3 | Supplies OLED and EEPROM |
I2C devices
- OLED SSD1306-compatible display: address
0x3C. - AT24C256-compatible EEPROM: address
0x50with address pins tied low. WP is tied to GND to allow writes.
ESP32 external module
- U3 is an ESP32-DEVKIT-V1 used as the external NodeMCU/DevKit-style module.
- Nucleo PA9/TX is connected to U3
D4/GPIO4 as the ESP32 receive input requested for the UART link. - U3
GNDandGND_1are tied to the common project GND.
STM32 HAL bring-up outline
- Configure system clock for the NUCLEO-F446RE.
- Enable GPIO clocks, I2C1, ADC1, and USART1.
- Configure PB8/PB9 as I2C alternate function open-drain with pull-up disabled or weak pull-up only; external 4.7 kΩ pull-ups are present.
- Configure PA0 as analog input.
- Configure PB12 as EXTI input; use internal pull-up if the external button pulls to GND.
- Configure PA9 as USART1_TX at the baud rate expected by the ESP32.
- Initialize OLED first, then probe EEPROM at
0x50, then start ADC sampling.
ADC note
The ADC input is biased at about 1.65 V using two 10 kΩ resistors from 3.3 V to GND. Firmware should subtract the measured midpoint baseline before calculating AC current.
Pin mapping
I2C devices
ESP32 external module
STM32 HAL bring-up outline
ADC note
