the use of PIR sensor and senses the temperature with the use of LM35(Temperature sensor). The projects are good example of embedded system basically designed using closed-looped feedback control system. In this tutorial, we are going to control temperature control temperature using a fan and DHT11 or DHT22 sensor. Oscar Gonzalez gives us a simple tutorial for speed controlling a PC FAN and reading a LM35 temperature sensor with an Arduino microcontroller. The fan will be used to reduce the temperature of a room at certain level. Here is arduino library function analogRead(A0) to read LM35 sensor value. In this article, we are presenting a tutorial on how to interface LM35 and Arduino along with its program. This automatic processing is done through an Arduino and a temperature sensor IC LM35. In this digital temperature sensor with Arduino, Arduino Uno is used to control the whole process. GARGI MEMORIAL INSTITUTE OF TECHNOLOGY Page 10 CIRCUIT DIAGRAM Fig 2 - Circuit Diagram of the Temperature-Based Fan Speed Control & Monitoring using Arduino 11. ... speed control of fan … Apply temperature to LM35 sensor more than set point it will turn on the relay (Heater). Fan control temperature using sensor LM35 circuit diagram made to control the fan is either used on amplifier that requires automatic cooling. ARDUINO UNO The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). Its use on power amplifier circuit above and only requires DC fan. The project ‘Temperature Controlled Fan using arduino’ is simply fabricated around arduino uno board and temperature sensor LM35. if this tutorial helpful for you then like and subscribe to my you-tube channel for more helpful tutorials, thank you. This sensor is very easy to use and having very good accuracy compared to other sensors. If you want to use DS18B20 sensor instead of DHT sendsor, see Arduino - Cooling System using DS18B20 Sensor . To build the fan, we use LM35 heat sensor. here you can see the ISIS Protuse simulation with LM35 and Arduino-Uno board.serial terminal print the live room temperature value as you Chang sensor value. It can even read relative humidity also. We won’t use that pin in this tutorial, so it should be left unconnected. Arduino and LM35 Interfacing. I made this project because I wanted a way to automatically control the speed of a DC fan according to the temperature read by a LM35 sensor. The sensor can measure a fairly wide range of temperature (-50°C to 125°C), is fairly precise (0.1°C resolution), and is very low cost, making it a popular choice. Problem 2 if it is less it will turn off the relay. Arduino Uno senses the temperature and control the speed with the set temperature. I want to control a DC fan with an LM35 and an Arduino Uno. An LM35 temperature sensor is used for sensing environment temperature which gives 1 degree temperature on every 10mV change at its output pin. I'm building a smart house model with arduino for my school graduation. The shield Compact Temperature controlled fan on/off switch is based on Arduino Nano multipurpose TWOVOLT shield, the circuit consist LM35 temperature sensor, 16X2 LCD, 12V relay including driver transistor, circuit works with 12V supply and can controlled any fan from 12V to 230V AC, for testing purpose I have connected 12V DC fan. So the coil voltage required would be higher. In the range, it can be controlled by the fixed temperature so that it can easily be done. This project presents the designs and the simulation of a DC fan control system based on room temperature using pulse width modulation technique and temperature sensor namely LM35 with Arduino Uno Microcontroller. When the temperature is cool, turn off the cooling fan. The micro controller drives Transistor to control the fan … Schematic Diagram. This is set by the user. Arduino would control 3 leds plus 2 servo motors with bluetooth Inside the house I would also like to emulate an air conditioning system. This code demonstrates how to construct digital temperature controller using arduino. When the current temperature is greater than or equal to the set temperature the fan … Once we successfully interface arduino and lm35, we will go on to build a temperature display using arduino and a 16×2 LCD module which constantly monitors temperature around the measurement field/range of LM35 and displays the same on LCD module. By: Ankit Negi. PID Control : Arduino Uno + LM35 + CPU Fan May 30, 2016, 12:08 am Hello everyone! Facebook; Twitter The second temperature controlled dc fan circuit project discussed below automatically senses the ambient temperature and adjusts the fan motor speed to keep the surrounding temperature under control. The output voltage of the sensor is directly proportional to the temperature in centigrade. In this article, I will explain how to interface LM35 and Arduino along with its program. Description: Temperature controlled Fan or Room Cooler using Arduino- In this project, you will learn how to make your own Fan, room cooler, ceiling fan or exhaust fan automatic temperature controller using Arduino, DHT11 temperature and humidity sensor, and a relay module.The Room Cooler or Fan is controlled automatically depending on the room temperature. Fig. Temperature sensor LM35 and Arduino Uno are the hardware used interfaced with computer, and the temperature is controlled in the room. We will use the DHT22 sensor to get the temperature value and we will print this temperature … LM35 is a temperature sensor which sense temperature and generate voltage according to temperature According to datasheet of LM35 it produces 10mV per degree change in temperature. Arduino have inbuilt 10-bit ADC i.e. 1024 steps. 1: Circuit diagram of the temperature-based fan speed control and monitoring using Arduino. If you are using a 5V relay instead of 12V relay, you only have to connect the arduino GND. So, this cause the fan unable to move even if the temperature exceed the threshold temperature. HARD WARE EQUIPMENTS Arduino UNO Temperature Sensor LM 35 LCD Display LED 16 X 2 Display DC Motor 9V Battery 9V Resistor Potentiometer Capacitor Transistor Diode 7. In here the PIR sensor as an on / off device with input detects human or human movement. I had a few problems with the PWM part mainly because the fan made a disturbing noise so I had to add a simple RC filter at the output of the PWM pin on the Arduino … You should follow the same schematic diagram whether you’re using an LM35 or LM34 temperature sensor. The temperature value is stored in variable ADC value and almost double the temperature value. 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