However, I am having 2 little issues, so please bear with me. I might fork it and pull the commit so that it can be easier to work withI'd love to see some pics of your finished project! DHT22 sensor is used to sense the room temperature and then we adjust speed of a DC fan/motor accordingly using PWM (Pulse Width Modulation). I referred to this article about the Leonardo's PWM to clock the fourth timer to 23437Hz which is the closest it can get to 25KHz. This project is about driving a two speed fan with an Arduino, based on the environment’s temperature. Also, the pin 9 output (relay) doesn't seem to go high, even when the duty cycle shows 100%. Temperature and monitoring using Arduino The MCU on Arduino drive the motor driver to control fan speed. Anyway, I await the arrival of the DHT22 that I bought ... when I arrive, I test and put the result. Working of Automatic Temperature Controlled Fan using Thermistor. Arduino temperature controlled PC Fan. Working of Automatic Fan. Here we could add a fan health control to see if the fan revs to a certain value. Temperature Controlled Fan with LCD Using Arduino. Maybe you did something wrong the first time. Using an analog temperature LM35 interfaced to the built in ADC of a programmed Arduino to develop varying duty cycle of PWM output for a driver IC to run a DC motor automatically according to the sensed temperature at different speed based on the temperature sensed. The PWM frequency is set to 23437 Hz that is within the 21k-25k Hz range so it should work with any PC fan. I have this code running just fine and I also know of a few people that are having no problems with it, so I doubt that's a fault on my part but we shall see. Program is simple and straight forward, it basically check the temperature and compare between two temperature range (25 0 C to 60 0 C). 11 months ago, Hello! Facebook; Twitter attachInterrupt(digitalPinToInterrupt(SPD_IN), pickRPM, FALLING); // Setup the PID to work with our settings. So all I basicly need is two temperature sensors, relay and fan to control. In this post, we have described how to design Temperature Based Fan Speed Control & Monitoring With Arduino and LM35 Temperature Sensor. It is built around Arduino Uno board (Board1), 16×2 LCD (LCD1), temperature sensor LM35 (IC1) and a few other components. The system uses a temperature sensor to control four fans that are driven by an Arduino controller. First is the program only seems to run with my IDE serial monitor open. The output from sensor is … He covers the use of an optocoupler, PWM (Pulse Width Modulation) and reading analog voltages with the Arduino. The control board is pretty simple and compact. The project has been designed to help automating an existing fire-based heating system. It is also work best for cooling the electrical equipment or machines since it has a more efficient power consumption compared to … One 5V and 12V dual output power supply: You can use 2 separated PSUs or a 12V with a step down converter to 5V (€ 15.00); Total cost: € 74.00 (if I had to buy all the components on Ebay/Amazon). Hello,Unfortunately the timer setup is specific to the ATmega32u4. fanPID.SetOutputLimits(DUTY_MIN - DUTY_DEAD_ZONE, 255); // Let the fan run for 5s. Arduino based Automatic Temperature Controlled Fan Speed Regulator Block Diagram Many projects that use a temp sensor, but never the most simple thing: control the speed of the fan. The output from sensor is … According to the software code fan start to rotate at 30 0 C and at … micro-controller circuit which consist of Arduino board. This automatic processing is done through an Arduino and a temperature sensor IC LM35. The box is held up by 4 screws passing through holes the acrylic base. 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