Multi-Sensor IoT Safety Project Using ESP32

ESP32 IoT Home Safety Kit — Flame NHR0057 & Multi-Sensors Overview: A compact IoT smart-home safety kit built around the ESP32 with real-time alerts to the Blynk mobile app and local warnings on a 16x2 I2C LCD. Detects flame, gas, high temperature, and overcurrent to trigger alarms, fans, and a relay cutoff—ideal for science fairs and final-year projects. Specifications Core: ESP32 WiFi & Bluetooth Development Board Flame sensor: Flame Sensor Module NHR0057 Temperature sensor: NTC 3-pin temperature sensor Gas sensor: MQ-2 Gas Sensor Module Current sensing: ACS712 Current Sensor Module 5A Display: 16x2 LCD with I2C adapter Power: 2 × 18650 3.7V Li-Ion batteries, 2-chamber holder Voltage regulation: 2 × LM2596 Buck modules (5V and 3.3V) Actuators & alarms: 5V active buzzer, 5V DC cooling fan, 5V single-channel relay Control components: 2 × BC547 transistors, 1 kΩ base resistor Adjustable threshold: 10 kΩ potentiometer for max-current setpoint Switching & wiring: 2-pin SPST rocker switches, 22AWG wiring, PVC project board Behavior: Blynk notifications + LCD warnings; auto fan on high temp; buzzer and relay cutoff on flame or overcurrent