Smart Battery Monitoring Design
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ESP32 Safety Sensor Hub Wiring Reference
Purpose
This schematic implements the attached ESP32 DevKit V1 wiring reference for a safety/sensing hub powered from a 12V barrel jack through an LM2596 5V buck module.
Power
- 12V barrel jack J1 feeds LM2596 buck converter U2 input.
- U2 5V output feeds ESP32 DevKit VIN/5V, MQ-2 module header, relay modules, and ESP32-CAM.
- ESP32 DevKit 3V3 rail feeds DHT11, flame sensor header, DS18B20, MLX90640, OLED, buzzer, and the DS18B20 pull-up.
- All modules share common GND.
GPIO Map
Table
| Function | Component | ESP32 DevKit Pin |
|---|---|---|
| MQ-2 analog output AO | J2 PIN_3 | GPIO34 / D34 |
| DHT11 DATA | U3 DATA | GPIO4 / D4 |
| Flame sensor DO | J3 PIN_3 | GPIO35 / D35 |
| DS18B20 DATA | U4 DQ | GPIO32 / D32 |
| I2C SDA | U5/U6 SDA | GPIO21 / D21 |
| I2C SCL | U5/U6 SCL | GPIO22 / D22 |
| Relay 1 fan IN | K1 Signal | GPIO26 / D26 |
| Relay 2 aerosol IN | K2 Signal | GPIO25 / D25 |
| Active buzzer signal | BZ1 I/O | GPIO27 / D27 |
| ESP32-CAM TX | U7 U0T | GPIO13 / D13 |
Notes
- MQ-2 and flame sensor modules were represented using labeled pin headers because exact module parts were not available in the Flux library.
- DS18B20 waterproof probe was represented by the electrically equivalent DS18B20+ sensor part.
- The requested ESP32-CAM RX ↔ GPIO0 connection is left optional/unconnected because the selected ESP32 DevKit V1 symbol does not expose GPIO0 as a pin.
- Verify external module voltage tolerance before hardware assembly; MQ-2 AO may be a 5V analog output and ESP32 ADC pins are not 5V tolerant.
Purpose
Power
GPIO Map
Notes
