Make A DIY Temperature Controlled Fan Using Arduino Nano And A 5V Relay

[@BMonsterLaboratory]

I hope this video is helpful to you. I have included everything you need to build a temperature controlled fan with Arduino. If you find it helpful, give it a like 👍 Check out some of of other videos - consider subscribing to the channel if you like the content. Thanks for watching!

[@TheSoapyJew]

Great video. Helped me finish my project that's very similar. Thanks bud.

[@BMonsterLaboratory]

Great to hear! Thanks for leaving a message 👊👊

[@yasinsherif8875]

it would be helpful if you include schematic diagram also

[@BMonsterLaboratory]

hey there! Thanks for the feedback, and I totally agree with you. I include a diagram in my more recent videos. Sorry there's not one in this video. If you need to know the connections or you're having trouble, i'm happy to help 👍

[@tomhoekstra1088]

Hi, I like your set up, but where can I copy the sketch? Writing it from the screen is quite difficult :)

[@BMonsterLaboratory]

Hi Tom. I copy all code to the Facebook page, mainly because it doesn't fit in the description sometimes. Here is what I used.
#define FANpIN 5
#define GREEN 3
#define RED 4
int ThermistorPin = 0;
int Vo;
float R1 = 10000;
float logR2, R2, T;
float c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07;
void setup() {
pinMode(FANpIN, OUTPUT);
Serial.begin(9600); // Serial Monitor
pinMode(RED, OUTPUT);
pinMode(GREEN, OUTPUT);
}
void loop() {
Vo = analogRead(ThermistorPin);
R2 = R1 * (1023.0 / (float)Vo - 1.0);
logR2 = log(R2);
T = (1.0 / (c1 + c2*logR2 + c3*logR2*logR2*logR2));
T = T - 273.15;
T = (T * 9.0)/ 5.0 + 32.0;
Serial.print("Temperature: ");
Serial.print(T);
Serial.println(" F");
if (T > 74) { // If temperature is more than 74
digitalWrite(FANpIN, HIGH); // fan on
digitalWrite(RED, HIGH);
digitalWrite(GREEN, LOW);
}
else if (T < 74) {
digitalWrite(FANpIN, LOW); // fan stays off
digitalWrite(RED, LOW);
digitalWrite(GREEN, HIGH);
}
delay(3000); // Waits for 3 seconds to read the pin again
}

[@BMonsterLaboratory]

There are other ways to do it...i"m sure you could improve on what I have here. Hope that helps! 👍

[@tomhoekstra1088]

Thank you it saves me a lot of time and possible mistakes!

[@BMonsterLaboratory]

@@tomhoekstra1088 welcome anytime!

[@tomhoekstra1088]

@@BMonsterLaboratory That is kind to say, but I'm shure I cannot (I'm an technical engineer and do not know anything about electronics) but I can copy quite nicely :) - unfortunately I have only a TMP36 thermo sensor, which you do not use. I assume I better do not cut off one of the legs haha but where to connect to, I have no idea...

[@irfanfendi2767]

Is it possible to do it without the relay? Cuz i followed your temperature sensor with lcd on it and now i need to put the fan into the circuit but still confused

[@BMonsterLaboratory]

Hi Irfan! Yes, you should be able to do it without a relay. You can use a 9v power supply (wall adapter or battery connected to Vin/GND). From the 9v power supply i'm thinking you can use a voltage divider circuit and drop 9v to 5v so you can connect it to pin 5. You don't want to connect more than 5v to your digital pins. I haven't tried this ...just thinking out loud. If you're unsure or need help, let me know and I can try it and send you a circuit diagram. hope that helps! good luck