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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Originally posted 2018-01-02 08:06:38.

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Comment (24)

  1. Hi, is it possible to do exactly the same but with a sensor that mesures voltage instead of temperature? Thank you very much!!!

  2. If I am trying to control three different high-voltage devices with one Arduino, do I need a 3-channel 5V relay? Each device needs 100V of external power.

    1. u need 3 relays. otherwise when u connect relay on the output to all 3 of the devices that u have, all of them will turn on in the same time.

    1. There will no chance of short circuit as long as you connect the output to something else (like a light bulb). If there is a short inside the relay for some reason, it will just simply turn the output ( light bulb) on forever, until you manually unplug it.

    2. The only chance of a short is when you connect the relay to nothing (not even a light bulb). If such cases occur (two wires connect to nothing), then a short circuit will occur.

  3. Hi I have a problem and I would like your help. I did everything you said and the lamp is working correctly. But when I put a circulator to operate with, it doesn’t work. But the lamp is still working! Could you help me please!

  4. Hi…I have a problem… I think if arduino can helps me… Let’s see… I have an axle that turns at 600rpm and it has a off-centre on it, and i want to find with strob light the degrees of the off-center… what do you think? Can you help? Thanks in advance…

  5. hi, thanks for the video. If I want to control wall lamp from arduino, is it ok just connect lamp’s vcc and gnd to relay and connect relay to arduino or should I put something to remove effect of triggering relay (high voltage, electrostatic feedback etc) ?

  6. hi sir,

    its very nice.

    can i control multiple sensors at the same time.
    delay() command will interrupt the other sensor activation please give me some ideas about multiple sensors

  7. Could you add a time in this sketch? Let’s say turn relay off or on within the temperature limits already preset for 10 minutes? After that the loop stops.

  8. Say…If you add another sensor along with the temperature sensor and 5V output. Your analog read will mess up the Temperature Equation. How you go about solving it?

  9. can i use relay on digital pin 23 on arduino atmega bcz i dont have the space to connect it on pwm pins. i want to control a 12v dc pump..????????

  10. Thanks for sharing. How about two ways control? I wish to control some heating system valve. We have a cylinder for the heating system and a hot water cylinder. I use ESBE ARA45 motors which have live, neutral and com wires. I need to control this valve in between the two cylinders. When the water temperature reached a certain level in the heating system cylinder, the motor should switch to the hot water cylinder to make hot water, So pretty much 2 sensors and dual motor control. If anybody can help me out on this would be brill. Thanks. I have two of this valve in my house a third which is the mixing valve.

  11. Forgive me if I am wrong but the data sheet for the Songle SRD-05VDC-SL-C appears to indicate that the current drawn by the 5V SRD relay is 71.4mA. (

    According to the Arduino site the recommended DC Current per I/O Pin is only 20mA. (

    Since you have to put the pin to the relay in a High state to activate the relay (one way or another) you are providing a constant 5V @ 71.4mA from the Arduino plus whatever the Thermistor and resistor are drawing. Could this potentially damage the Arduino by using a relay that draws more current than recommended?

  12. Good video, but is wording that goes the graphics starting at 0:41 backwards? The arrows appear correct, but the first image seems it should say “Normally Closed” instead of Normally Open. Compare 0:41 to 4:26 to see what I’m talking about.

  13. so unclear, whych ports goes where and why ? wich resistors to use and some capacitors and why? if i want to add delay timer it takes 3 days to sit in forums and youtube to find out modules are incomatible GRRRR

  14. Instead of AC high voltage to power light bulb, is it possible to test this with 9v battery to small LED light?
    I know it says 30 VDC so will 9v battery damage the module or even worse arduino board?


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