Diy Fan Automatic On And Off Using Arduino Relay And Temperature Sensor 3. lm35 temperature sensor. about relay: relay is a switching device. like we put the switch in a normal circuit and do it on and off similarly relay is a device when receives command makes switch on or off. in this tutorial when the temperature exceeds 26 degree celsius then arduino pin 1 is high i.e. the vin pin of the relay will get 5 volts. First of all, make the connection of the lcd module with the arduino as follows: connect vss pin of lcd to ground of arduino. connect vdd pin to 5v of arduino. connect v0 pin to the center pin of 10k potentiometer. connect other two pins of potentiometer to the 5v and the ground. connect rs pin to the pin 2 of arduino.
Temperature Controlled Fan Using Arduino Arduino Project Hub Build a smarter exhaust fan that operates in a temperature range you define. this allows you to keep a good climate control without running a fan 24 7. using. Problem 1. the gnd of the 9v battery is not connected to the gnd of the arduino. so, this cause the fan unable to move even if the temperature exceed the threshold temperature. solution 1. connect the gnd of the battery to the gnd of arduino – common gnd. if you are using a 5v relay instead of 12v relay, you only have to connect the arduino gnd. The fan and the plug were later added using photoshop. the diagram consists of an arduino,a relay, an lm35 sensor, an ac fan, and a plug. the temperature controlled fan circuit is very simple. the lm35 sensor has 3 pins vcc, gnd and analog output pin. the vcc pin will be connected to the 5v pin of arduino. The other sensor is outside the house, and reads "outside temperature" (ot). the arduino drives a relay to control the fan. since the relay may be in either state for long periods (days or weeks at a time) i decided to use a bi stable relay. this gives the advantage that the relay does not have to be continuously energised to maintain either.
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