ESP32 based Temperature Sensitive Smart Fan Regulator

Do you feel disturbed when you need to adjust the temperature? The wait is over, the solution is here! We often feel uncomfortable while sleeping due to certain changes in room temperature, but we don’t want to get up from sleep and regulate fan/AC due to lethargy. This hampers our sleep and may put a negative effect on our health. We will use Arduino IDE to program ESP32. Check out our previously built ESP32 based projects.

Previously, we have worked on some smart fan projects,

Build an Automatic Motion Controlled Smart Fan using ATmega328 and Motion Sensor

IoT Based AC Fan Speed Control using Smart Phone with NodeMCU and Google Firebase

Simple Fan Regulator Circuit to Control the Speed of AC Fan

Temperature Controlled DC Fan using Thermistor

Component Required for Smart Fan Regulator

Project Used Hardware

ESP32, HC05, LM35, DHT11, TP4056, Arduino Nano, TRIAC, Optocoupler,3.7V Li-Po battery, 5V boost module, Bridge rectifier, LEDs, Resistors, Push to ON SPST, micro-USB type B female, Wires

Project Used Software

Kodular Creator, Google Firebase, Arduino IDE

Project Hardware/Software Selection

ESP32: ESP32 is used for its built in WIFI and Bluetooth feature along with its powerful circuit controlling ability.

HC05 : HC05 is one of the most popular Bluetooth module out there and its easily available.

LM35: LM35 temperature sensor is being selected for its small and compact size.

DHT11 : DHT11 is being used as room temperature and humidity sensor. We selected it due to its compact size and easy availability.

TP4056 : TP4056 is used for charging the Li-Po battery inside the temperature tracker.

Arduino Nano : Arduino Nano is used as the medium for recording the body temperature and sending that data to control unit. We selected for its small and compact size so that we can fit it into the box (though Arduino Pro Mini could have been used).

TRIAC : TRIAC is used for controlling the AC motor of fan.

Optocoupler : Optocoupler is a part of TRIAC based dimming circuit.

3.7V Li-Po battery : This is used for small and compact size.

5V boost module : Boost module is being used for boosting the 3.7V of battery to 5V and to power the Arduino board.

Kodular creator : We selected Kodular for building the application, its free and popular.

Google Firebase : Google Firebase is one of the most popular and free database.

Smart Fan Regulator Circuit Diagram

We have made an automatic AC dimmer circuit following the zero cross detection technique. We have used LM35 as the temperature sensor for sensing body temperature and DHT11 for sensing both room temperature and humidity. Arduino Nano and HC05 is used for bluetooth communication between temperature tracker and main control unit(ESP32). Data collected from these sensors are processed by ESP32 and it controls the fan speed accordingly.

Complete Project Code