arduino 5v input
The relay I’m using is a s Rd 0. 5. Vdc s LC 5 volt relay this really has three terminals on the top. You have the normally closed terminal in the middle you have the common terminal and on the bottom you have the normally open terminal. The normally open terminal is powered when you send a 5 volt signal to the signal pin of the relay the normally closed terminal is shut off. When you send a signal to the signal, pin and the common terminal is what supplies the power to the normally open and the normally closed terminals. So I have it set up so that the hot side of the power cord is connected to the common terminal of the 5 volt relay, and I have another wire coming out of the normally open terminal of the relay and that wire is connected to the hot Side of the light fixture, I have the negative or neutral side of the power cord connected to the neutral side of the light fixture. So when we send a 5 volt signal to the relay through the signal pin, the relay will be activated and it will close the switch between the common terminal and the normally open terminal and current will flow through and power. The light bulb, in this case we’re, going to be using a thermistor to tell the Arduino at what level we should send a signal to the relay so that it activates and then closes the switch and turns on the light bulb.
So we’re going to set up our thermistor voltage divider, just like we did in our Arduino thermistor temperature sensor video. You might want to look at that, but we’re going to insert a 100k thermistor into the breadboard, along with a 100k resistor, now we’re going to connect the side of the thermistor that’s not connected to the resistor we’re, going to bring that over to the 5 volt Pin of the Arduino and then we’re going to take the side of the resistor that’s not connected to the thermistor and bring that over to the ground terminal of the Arduino. And then we’re going to take the rail of the breadboard that both the thermistor and the resistor are connected to and bring that over to the analog, pin zero of the Arduino, and that sets up our voltage divider. Now we want to connect the relay up to the Arduino, so we take a jumper wire from the signal pin of the relay and connect that to digital pin 10 of the Arduino. Now we take a jumper wire from the positive pin of the relay and bring that over to our positive rail on the breadboard and then take a jumper wire and connect that to the negative end of the relay and bring that over to the negative rail of The breadboard alright so now we’re all set up let’s, go back to the blog post and get the code so copy that open up the Arduino IDE paste it in there.
So this is our standard thermistor program. It takes the voltage detected by the Arduino at the analog, pin, zero and converts that into a temperature reading, and then we can use an if statement to say if the temperature is greater than or equal to ninety degrees. Fahrenheit then digital right to pin out a low signal. So if the temperature is greater than ninety, then the output at our output pin, pin ten is low and the relay will not be activated. Otherwise, if the temperature is less than ninety, then we will send a high voltage signal to digital pin 10 and that will activate the relay and turn the light bulb on alright. So now that we have it uploaded, the board temperature is below ninety degrees Fahrenheit. So the light turns on and as soon as I squeeze it, the temperature raises above ninety and turns the light bulb on and on all right. Well that’s it. So let me know if you have any questions about it in the comments. I’Ll be happy to answer them and don’t forget to subscribe. We’Ve got a lot more videos coming out and I hope to see you again all right.
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