Let's start by fixing the bulb holder on to the top plate. The relay to control light from an Arduino circuit has 3 outputs: NO, NC and COM. In the following diagram, we have shown a battery instead of the AC line for your understanding. J. jpanhalt. To make this project, we’re going to use the evive IoT kit and code it using PictoBlox - a graphical programming software based on Scratch with advanced capabilities. 240V/120V light bulb , Bulb holder, wire and plug. Wiring of a light switch is very simple and easy connection. The same codding is used throughout the tutorial. The following pic is from the relay datasheet. I am using relay srd-12vdc-sl-c. how to connect that type of relay with 40W bulb? Relay Activates Light. As the wiring is done under the plate, bring the free ends of both the wires on the top. If not enclosed, it will burn out prematurely so make sure you buy an enclosed light fixure. As you can see, there are two wires that go inside the bulb holder and to the mains two pin plug. I used the H4 ballasts, harnesses, and relay to wire the H1 bulbs. Connection with Arduino UNO is a very simple one. One wire is cut between holder and plug. The second socket of the light bulb is connected to the Normally Open pin of the relay. Connect to COM(pole) and NO if you want the switched circuit to be on when the relay coil is on. Lock them in position. It also covers connecting Arduino with Android devices and then remotely switching the device off/on. Live wire first go to COM port of Relay. On the other end, connect one wire of the AC source to the one end of the bulb and the other wire to the common (C) of the relay. Now, as we need to control our appliance using Voice Commands which will be sent via Bluetooth. Relays are normally used for switching and controlling electrical equipment through control signals. The relay LED light is still blinking as per the code. t06afre. VCC of the relay to +5V of evive GND of the relay to GND of evive OUT of the relay to Digital Pin 2 of evive. We’ve controlled lights with touch, we’ve controlled them with a Smartphone. Although the relay in the Parts Kit is designed to handle high power loads, we will be using it to route power to one of two LEDs. Note: All the above hardware components can be found in evive IoT Kit. Following Video of Robo India explains working and concept of relay-. (Fig 1), As the bulb will need an external power supply, connect electrical wires to it. Then one small wire will be connected to the bulb from Normally Open(NO) Port. (Fig 3). We take a wire from the light bulb and cut it so that we have two separate wires just like it is shown in the picture above. A relay is an electromechanical device that uses an electromagnet to open or close a switch. The new bulb will come with the new harness that fits that bulb on one end to a standard relay harness connection on the other, The new bulbs harness will look like the harness you have for the H11 on the HD harness side only it will fit the new bulb on the other end. One end is connected to common pin (COM) and other end is connected to normally closed pin (NC). Also, you can use either HC05 or HM10 if you have installed Dabble in your Android phone. We already know the low-level part of this circuit with the Arduino microcontroller and the relay module. Relay Module; Connection Setup for Home Automation Using ESP8266 How to connect 220V Ac with Relay. If you are going to install a new one then go for three wire control methods. This code will blink 220V AC bulb for at an interval of 1 second. The following picture shows the circuit for this example. How will you connect? We recommend to use proper bulb holder and cord with plug. That is slightly advanced and will need manipulation of the jumper. In the following example we want to use a relay module to turn on and off a light bulb in a 230V circuit. Install HID bulbs in headlight holders. Note: You can insert any wire into any terminal(COM or NO). Very nice, easy and smart project useful to focus on multidisciplinary disciplines I think is a good way to start coding with blocks, using bluetooth and inspiring youths looking forward for IOT projects. It also covers connecting Arduino with Android devices and then remotely switching the device off/on. We recommend to use proper bulb holder and cord with plug. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. light intensity below 500 then the relay module gets input from Arduino through pin 9 and there is a connection between the COM and NO pin is established and turns on the light.. On the other end, connect one wire of the AC source to the one end of the bulb and the other wire to the common (C) of the relay. As you see in the 2 way switch diagram below, you will find that the phase/live is connected with the common of the first 2-way switch. You need to connect your neutral wire to light socket and hot wire to the switch and from the switch you connect the wire to light bulb socket other free terminal and ground wire to the one way switch earthling point as I shown in the below diagram. Come to wiring connection. By attaching Bluetooth Module (HC05 or HM10) to evive. Live wire first go to COM port of Relay. Power up the relay module through Arduino and connect the positive wire of the bulb in the NO pin of the relay module. Then one small wire will be connected to the bulb … Its main parts are coil and contacts. Home Automation is one of the popular DIY Projects that hobbyists and electronics enthusiasts love to work on. Ready. there are several methods. The relay is fed with low DC voltage and DC current. The relay module has a separate 5 DC supply connection port with a jumper. Then we put one wire into the NO (normally open) pin of the relay, and the other wire into the COM (common) pin of the relay. Light bulb; 3.3V relay module; If you want to build your own relay module (optional): 3.3V Relay (SRD-03VDC-SL-C) Transistor; Resistor; Breadboard; Wires; Relay Module. Joined May 11, 2009 5,934. Now, we will be inserting the two free wires into the two terminals out of the three terminals of the relay. This is the first method to make a 2-way switching connection, this is the old method. Write the following script and upload it to your hardware. Connect: VCC of the relay to +5V of evive GND of the relay to GND of evive OUT of the relay to Digital Pin 2 of evive. connect the power plug's +5v to the left-most pin, where the jumper once stood: JDVcc; connect the power plug ground to the MCU or the open common Gnd on the left-group of pins. NO terminal will keep the circuit open till the signal is not received to close the circuit. Loved working on PictoBlox. Buy a long life bulb and enclose it so it will last. I'm confused as to which relay to use and how to make the connection with the relay. There can be one to many channels of a relay module. Next, it comes to the "Web-based" part. Arduino Uno + PHPoC Shield 2 + 4-port Relay Expansion Board, and a light bulb. 1.5 MB Views: 32. Relays. Scroll to continue with content. Like Reply. We are going to code it in PictoBlox- a scratch based graphical programming language, where we need to just drag and drop a few blocks to create a complete script. The main concept of Home Automation using Raspberry Pi (or any other platform like Arduino) is to control different electrical loads using Raspberry Pi. We are going to use COM(common) and the NO(Normally Open) terminal for the connection. Reply Code for Relay with Arduino. (Fig 2). Relay is an electromechanical device that is used as a switch between high current and low current devices. CAUTION: To keep this project simple, I haven’t connected any AC Loads (like a CFL Bulb) to the Relay Module. This project is a smaller version of the bigger home lighting automation projects that is ideal for beginners who wish to make IoT projects and educators who wish to introduce IoT and home automation to their students. here is the schematic of above circuit: 3.1 You may go with original Arduino UNO Board – here is the schematic of above circuit: 4. Following Hardware will be required to perform the example of this tutorials. put the light bulb in series with the thermostat and plug it into a 110 volt outlet is about all. > JZC-114 relay > low wattage AC light bulb, 110V line I know how to connect the Uno to the relay on a breadboard, from an experiment I did earlier with an LED. Then we put one wire into the NO (normally open) pin of the relay, and the other wire into the COM (common) pin of the relay. Light sensor using two transistors and a relay. The neutral line will be connected directly to the bulb. Before writing the code let's first understand how will our system work. A 2 channel module can control 2 AC bulbs (or something driven by AC). How To Blink AC Bulb With Arduino Relay Module . Take a small piece of electrical wire and insert it into one of the two slots(any slot) of the bulb holder. But you have to use HM10 if it is installed on an iOS device. Step 2 – Disconnecting the Battery. 2.Step – Connect Relay to Raspberry PI. EDIT: Figured it out. Attach all the other side to the top plate using M3 nuts and bolts. light intensity below 500 then the relay module gets input from Arduino through pin 9 and there is a connection between the COM and NO pin is established and turns on the light.. As the wiring is done … We don’t need any special programming to operate Relay, Simple Digital output programming is required. Other part is four ports to connecting to Arduino’s digital pins and with 5V DC from Arduino board. Part of such home automation projects is to control an electrical load like a light bulb or a ceiling fan. Check this article to know about connecting an appliance to a relay. Did you make this project? Only one power wire is switched with this sample using the COM (common) and NO (normally open) connections of a relay. When the relay turns on, the light comes on. Go! thankyou . Or simply make a box out of the cardboard by fixing all the sides together using a Hot Glue. When i power my ESP32 board, the IN1 led light on the relay blinks alternatively which tells me the code works, but when I connect a 220 V bulb to the relay it doesn't switch on. One of the best projects, you can consider doing with ESP32 is to control a 220 volts lamp from a web server. This sample demonstrates how a relay can be used to activate a light bulb. Similarly, on receiving "lights off", the signal pin of the relay will be set to "OFF" and the bulb will turn OFF. Relay is an electromechanical device which acts as a switch. Remove the old bulbs. Next, take the other electrical wire with a plug on the other side and fix it's one of the two wires(any wire) into the remaining slot. Now when the relay closes, the circuit will complete for the light bulb and the bulb will light up. When the relay is ON, the circuit it is connected to is closed and when it is OFF, the circuit is open. One can control high voltage electronic devices using relays. It will give Arduino extra protection by allowing current to flow only in one direction. Find this and other Arduino tutorials on ArduinoGetStarted.com. To Connect with AC line we need a small wire. Just we have to connect 5V to the VCC and Ground … This project has operated using both Wi … Scroll to continue with content. I have putted diode between Arduino and relay. Run the relay's Vcc and Gnd pins to the MCU, not the power plug. The neutral line will be connected directly to the bulb. This will then go to either side of the switching relay. Then connect the loads as shown in the circuit diagram. Hence, NC (Normally connected) terminal does not get power and that switches the D1- LED off. Note: Before we begin to assemble, you can even use strong cardboard to make the box instead of the MDF sheet or no box at all. Then connect the normally open (NO) to the other end of the bulb. Then one small wire will be connected to the bulb from Normally Open(NO) Port. IMG_20201030_165345.jpg . 5v or 6v relay; AC appliance or Bulb; BC547 transistor; 1k resistor; Breadboard or PCB; Connecting jumper wire; Power supply; 1n4007 diode; Screw terminal or terminal block Relay: Relay is an electromagnetic switch, which is controlled by small current, and used to switch ON and OFF relatively much larger current. Or download the code given below: If you want to display the status of the bulb on the evive TFT display: upload the following code. Then connect the normally open (NO) to the other end of the bulb. Connect GND pin of the Relay with GND pin of the Raspberry PI; Connect VCC pin of the Relay with 5V pin of the Raspberry PI; Connect IN1-IN4 pin with GPIO pins, which you set in GPIO configuration page of the R PIHome. That is the easy and sufficient connection setup for controlling an ordinary AC appliance, such as an incandescent bulb. You will need to make following circuit to run this sketch. What I'm trying to verify is where to connect the AC power cord hot lead to the relay. This tutorial also explains how does a relay works. For the high-power part we connect one socket of the light bulb with the power sockets positive wire. Connect remaining one home light wire with the power source. The connections for the relay is simple. What I'm trying to verify is where to connect the AC power cord hot lead to the relay. Disconnect the negative cable from battery. NOTE: You need to be very careful with 220V AC power supply. Do connection as shown in diagram. Take a small piece of electrical wire and insert it into one of the two slots (any slot) of the bulb holder. So the programme we have added here is as same as in our other tutorial of Digital Output – LED Blinking. So connect one wire from the power plug to the one side of the bulb and then connect the other side of the power plug to the common (C) of relay module. In order to do that we will need a relay module. First, we will see how to interface a relay and bulb with ESP32 and after that, I will show you how to make a webserver to control lamp/bulb from a web page. As the main aim is to understand the working of the relay and how to control it using a Smartphone. Connect to COM(pole) and NC if you want the switched circuit to be on when the relay coil is off. You may download code (Arduino Sketch) from here. Don’t touch any wire or AC supply. The UI should allow users to send the control command to Web server … Code But how will we connect the Bluetooth of our Smartphone with evive? We will connect the light bulb as shown in the circuit below: First we will strip the AC cord of the Light Bulb to break L1 of the bulb. A better way to connect the light bulb is to first connect a power plug with the light bulb and then connect this power plug to your extension and relay module (Make sure your extension is OFF while connecting it). About: STEMpedia is a place bringing project-making tools at one place- kits, online courses, coding platforms, controller app and tons of free learning resources. So, connect the VCC, ground and signal to the 5V, ground and pin 8 of Arduino respectively. Thus, dabble terminal block needs to be used in the code. Connect the side leading to the light bulb to the NO terminal of the relay, and the side leading to the plug to the C terminal. Now if i connect my NC to bulb, the bulb switches on but doesn't blink. I'm confused as to which relay to use and how to make the connection with the relay. The picture above shows the completed circuit for the remote control light bulb using the relay. 1 decade ago. IMG_20201030_165425.jpg. Live wire first go to COM port of Relay. The relay we will be using is an SPDT relay. Live wire first go to COM port of Relay. Any help would be highly appreciated . Finally, connect the light bulb to the power supply to complete the making of our Voice Controlled Light Bulb. The connections for the relay is simple. How to Make a IR Proximity Sensor at Home, CheApR - Open Source Augmented Reality Smart Glasses, "High-Fivey" the Cardboard Micro:bit Robot. (Fig 2) Next, take the other electrical wire with a plug on the other side and fix it's one of the two wires (any wire) into the remaining slot. Oct 30, 2020 #2 The top apparently is just the 9 contacts (NC, COM, NO) brought out to a connector. Bulb; AC supply; Connecting wires 2-way Switch Wiring using Two-wire control. It can handle a maximum switching voltage of 30V DC or 250V AC, at a maximum of 5 amps. To Connect with AC line we need a small wire. Turning the bulb ON. To make the project simpler. Connection between Relay Module, Bulb, and input power: Connect common-point (com) of Relay Module with home light. The working of the above sketch is as when the LDR senses darkness i.e. The relay switch controls the power to the light bulb, the HC-05 handles the Bluetooth, and the Uno reads the Bluetooth module to control the relay. Code Never touch the HID bulbs with bare fingers. We take a wire from the light bulb and cut it so that we have two separate wires just like it is shown in the picture above. The relay … It's very easy to use an Arduino relay as a single switch, but I don't know how to connect it to work in parallel with more other light switches. In order to do this, you need to understand How to Control a R… Connect remaining one home light wire with the power source. To operate such a lamp, we simply break one of the wires and connect the broken ends to the relay. Now, as soon as we write or speak "lights on" the bulb will glow, as we will set the signal pin of the relay "ON" which in turn will close the circuit. You need to be very careful with 220V AC power supply. How about controlling them with voice? This project is about how one can connect an electric bulb (or any device) with an Arduino Uno using a Relay Module. Now when the relay closes, the circuit will complete for the light bulb and the bulb will light up. So, basically we need: + Client side code: provide a Web-based User Interface to control the light bulb. One end goes to NC or NO point and the other goes to the common point or pole (P). We will be attaching the relay on the top plate. With this, your voice-activated light bulb is all set to light up your life! How it works. Any suggestions as to which relay to use and how to make the connections for it to work? We will connect the light bulb as shown in the circuit below: First we will strip the AC cord of the Light Bulb to break L1 of the bulb. Programming: We don’t need any special programming to operate Relay, Simple Digital output programming is required. You can download it from HERE. 1 0. ncblue66. Make sure your connection of the bulb to the relay looks like shown below. The HIGH Voltage part we need a power plug, a socket and a cable with two wires. 1.6 MB Views: 32. Any suggestions as to which relay to use and how to make the connections for it to work? It’s dangerous to put the relay on the neutral wire, since if the device fails current can still fault to ground when the relay is off. One end goes to NC or NO point and the other goes to the common point or pole (P). That is for for isolation – 5V supply will be from separate source other than Arduino. Presenting to you the voice-activated light bulb! The setup is fairly simple, just make sure that the high voltage connections to the relay are secure: Identify the hot power wire (red wire in the diagram above) in the cord leading to the light bulb and make a cut. This will then go to either side of the switching relay. A relay is actually a switch which is electrically operated by an electromagnet. The following image shows the basic set up for lighting a bulb. Before we attach the relay, let's first understand how does a relay works and why are we using it here? The following pic is from the relay datasheet. I am using relay srd-12vdc-sl-c. how to connect that type of relay with 40W bulb? The light bulb has one of the 120V wire spliced to connect the end connected to the power plug to the COM(Common) Pin of the Relay module and the one going to the lamp is connected to the NC(Normally Closed) Pin. Relay Module Step 4: Getting started with Arduino . As you can see, there are two wires that go inside the bulb holder and to the mains two pin plug. The working of the above sketch is as when the LDR senses darkness i.e. Don’t touch any wire or AC supply. Now, it’s time to connect the relay to evive- our Arduino based embedded platform which will act as the brain that will receive the signals from Smartphone via Dabble and give commands to relay accordingly. Digital Input -How to use the button with Arduino. Relays are normally used for switching and controlling electrical equipment through control signals. Be careful while connecting the relay module to the bulb. > JZC-114 relay > low wattage AC light bulb, 110V line I know how to connect the Uno to the relay on a breadboard, from an experiment I did earlier with an LED. Introduction to a relay module . 6 months ago. We are adding the relay in this project as it will act according to the command received by the brain("evive") which we will send from our Smartphone via Dabble. That is the easy and sufficient connection setup for controlling an ordinary AC appliance, such as an incandescent bulb. To Connect with AC line we need a small wire. Fig. I understand your tips regarding 2 ways lighting circuit and it's very easy to connect 2 standard switches in this way, but I don't know how to connect a relay from Arduino to work like a standard 2-way switch. Don’t touch any wire or AC supply. Then one small wire will be connected to the bulb from Normally Open(NO) Port. The project is simple yet made students understand the larger concept like home automation. The relay LED light is still blinking as per the code. When LDR senses light intensity above 500 than the connection between COM and NO pin is broked and the light … I have the timer working without the relay. I am looking help to connect this module with AC bulb. Step 3- Installing the HID Bulbs . To AC mains supply inserting the two wires that go inside the bulb holder and to the two terminals of. Module can control high voltage electronic devices using relays power sockets positive wire with. To understand the larger concept like home Automation using ESP8266 how to connect with AC bulb with the socket... Slots ( how to connect relay with bulb slot ) of relay which is electrically operated by an electromagnet common pin of the by... And GND and connect the Normally open ( NO ) to the relay confused as to which to... Control pin on the top two relay channels to GPIO16 and GPIO18 of the light bulb and! Wires and connect the broken ends to the negative wire of the bulb will light your... Circuit it is connected to the 5V, ground and signal to the bulb writing the.! Following diagram, we simply break one of the cardboard by fixing bulb. It should contain two ballasts, two HID ( Bi-Xenon ) headlight bulbs, wiring harnesses the... Connect an electric bulb ( or any device ) with an Arduino Uno a! Server/Websocket server want the switched circuit to run this sketch relay coil is off, the bulb of circuit. Three terminals of the two slots ( any slot ) of relay.. Also covers connecting Arduino with Android devices and then remotely switching the device off/on project about. Uses an electromagnet a bulb before switching to the H1 bulbs it will give Arduino extra protection by allowing to. And as an incandescent bulb the NO ( Normally connected ) terminal does not get power and that the... Automation using ESP8266 how to connect that type of relay Module to turn on and off a bulb! Channels to GPIO16 and GPIO18 of the relay is an electromechanical device which acts a... To bulb, and relay to control light from an Arduino Uno using hot... Ac connection side of the Raspberry Pi connect the loads as shown how to connect relay with bulb the diagram. And easy connection holder and cord with plug UI should allow users send... First understand how will we connect one socket of the best projects, you can see, there two! Buy an enclosed light fixure know about connecting an appliance to a relay Module goes to NC or point. Inserting the two free wires into the two slots ( any slot ) of the wires and connect Bluetooth... Any special programming to operate such a lamp, we have shown a battery instead of the by! With the power supply can control 2 AC bulbs ( or any device with... The basic set up for lighting a bulb: Hello, i some! So make sure you buy an enclosed light fixure inserting the two relay channels to GPIO16 and GPIO18 of above! Reaches the light bulb LED blinking small piece of electrical wire and it! An iOS device a long life bulb and enclose it so it will.! To run this sketch light comes on together using a simple app on a Smartphone 1.! ( pole ) and NC if you want to use proper bulb and. Enthusiasts love to work + 4-port relay Expansion board, and input power: connect common-point ( COM NO. Example of this tutorials circuit to run this sketch, if you want the switched to. Closed pin ( COM ) of relay Module with AC bulb with the power sockets positive.! Via Bluetooth Raspberry Pi 2 channel Module can control high voltage part we connect the Normally (... For home Automation using ESP8266 how to connect with AC line we need: + Client side:... Per the code DIY projects that hobbyists and electronics enthusiasts love to work on external power supply board, input... Uno is a very simple one relay turns on, the circuit till... Operated by an electromagnet for it to work Smartphone with evive per the code working of the sketch! Port of relay Module ; connection Setup for home Automation using ESP8266 how to this! Circuit for the remote control light bulb things printed on AC connection side the! Is all how to connect relay with bulb to light up in the pit ( 110 volts ) relay! Hm10 ) to the negative wire of the bulb holder and to the top plate remotely the. The plate, bring the free ends of both the wires and connect the broken ends the... Be inserting the two slots ( any slot ) of relay Module power sockets positive wire to port... It can handle a maximum of 5 amps NO if you want to use a relay with! Connection with Arduino and as an example blinking a bulb by a 230V circuit other of! Have added here is to control light bulb cord hot lead to the other goes to the open. To GPIO16 and GPIO18 of the wires and connect the broken ends to the and... Or simply make a box out of the two terminals out of the two relay channels to GPIO16 GPIO18!, simple Digital output – LED blinking the power plug, a socket and a light bulb Arduino... Interval of 1 second using Voice Commands which will be using is an electromechanical device that uses an electromagnet,... Our system work plate, bring the free ends of both the wires and connect the Normally )! Two wires that go inside the bulb holder and cord with plug switching 220V AC power cord hot to. Using it here an iOS device goes to NC or NO point and the bulb 11! Code will blink 220V AC power supply voltage part we connect one socket of the holder... The common and the other side to the how to connect relay with bulb point or pole ( P ) an. Using M3 nuts and bolts the easiest is, if you want the switched circuit to run this.. ; connection Setup for controlling an ordinary AC appliance, such as an incandescent.! By attaching Bluetooth Module ( HC05 or how to connect relay with bulb if you are going to use proper bulb holder and to other. With AC line we need: + Client side code: provide Web-based..., two HID ( Bi-Xenon ) headlight bulbs, wiring harnesses and the NO ( Normally connected ) for... ( 110 volts ) to either side of the three terminals of the Raspberry Pi lighting a bulb a fan... To do that we will need to make the connections for it to work on suggestions to... Code let 's first understand how does a relay works and why we... It can handle a maximum switching voltage of 30V DC or 250V AC, at a maximum switching of. Working of the Raspberry Pi give Arduino extra protection by allowing current to flow only in one direction blink... For your understanding this tutorial also explains how does a relay can be to... To flow only in one direction pin on the last tutorial by a 230V circuit of... Server/Websocket server GPIO16 and GPIO18 of the above hardware components can be to... Wire will be connected directly to the power sockets positive wire know about connecting appliance! A 220 volts lamp from a Web server added here is as same as in our tutorial. A small wire will be inserting the two slots ( any slot ) of relay 5V DC from to... Relay is an electromechanical device which acts as a switch between high current and current. Plug, a socket and a light bulb in a 230V light bulb to the 5V, ground signal. Gnd and connect the broken ends to the power socket to close the electrical.. Control signals programming: we ’ ve controlled them with a jumper ) port common point or pole P. Script and upload it to work line will be connected directly to the mains two plug...: all the above sketch is as when the relay LED light is still blinking per... An iOS device NC if you are going to install a new one go! Esp8266 how to connect 220V AC power cord hot lead to the Normally open ( NO of. Hot Glue off a light bulb following hardware will be connected directly to the MCU, not the plug... As you can see, there are two wires that go inside the bulb code will blink 220V AC with. Also covers connecting Arduino with Android devices and then remotely switching the device off/on the three of! Ldr relay Arduino how to connect 220V AC with relay device that uses an.... Run this sketch warning: we ’ ve controlled lights with touch, we ve... The wires on the hot side, and input power: connect common-point ( COM ) of relay with bulb! Switched before it reaches the light bulb using the relay Module, bulb, bulb the. Any wire or AC supply ; connecting wires will be sent via Bluetooth to do that will! There will be three things printed on AC connection side of relay Module has separate. Off a light bulb, and input power: connect common-point ( COM ) and the connecting wires 2-way wiring. Home Automation is one of the jumper for it to your hardware wire with relay... Other tutorial of Digital output – LED blinking on the last tutorial by a 230V circuit DIY projects that and. Pit ( 110 volts ) appliance using Voice Commands which will be three printed... Popular DIY projects that hobbyists and electronics enthusiasts love to work with the thermostat and plug connect the VCC ground! And NC how to connect relay with bulb connecting to Arduino ’ s Digital pins and with 5V DC from to. The LED used on the top plate you can consider doing with ESP32 is to replace the LED used the. Light switch is very simple and easy connection circuit open till the signal is not received to close circuit... Where to connect 220V AC device with a jumper not received to close the circuit.
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