when i once touch it it switches on, and when i touch it again it switches off. Connect with us on social media and stay updated with latest news, articles and projects! Dec 28, 2017 This is a serious topic, and we want you to be safe. Connect an Arduino's pin to the IN pin of the relay, Control the relay by programming the pin to, Configure an Arduino's pin to the digital output mode by using, Copy the above code and open with Arduino IDE. In practice, we usually do NOT use all of the pins in the high voltage group. Just start by defining the digital pin number 2 of the Arduino as the Relay pin. But because the Arduino operates at 5 volts, it cannot directly control these higher voltage devices. ArduinoGetStarted.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com, Amazon.it, Amazon.fr, Amazon.co.uk, Amazon.ca, Amazon.de, Amazon.es and Amazon.co.jp. This code uses Arduino’s serial communication protocol with the Bluetooth module. You can use a relay module to control the AC mains and Arduino to control the relay. // the loop function runs over and over again forever, Arduino - Button - Long Press Short Press, Arduino - Potentiometer Triggers Piezo Buzzer, Arduino - Potentiometer Triggers Servo Motor, Arduino - Servo Motor controlled by Potentiometer, Arduino - Ultrasonic Sensor - Piezo Buzzer, Arduino - Ultrasonic Sensor - Servo Motor, Arduino - Door Lock System using Password, Arduino - Temperature Humidity Sensor - LCD, Arduino - Cooling System using DHT Sensor, Arduino - Cooling System using DS18B20 Temperature Sensor, Arduino - Button Controls Electromagnetic Lock, Example - 04.Single Blink Change Frequency, Example - 05.Multiple Blink Without Delay, LDR Darkness and Light Detector Sensor Electronic Circuit, Wemo Smart Plug, WiFi Enabled, Works with Alexa, Google Assistant & Apple HomeKit, please give us motivation to make more tutorials. To use this mode, we need to connect the high voltage device to the COM pin and NC pin. Commonly used Relay is Single Pole Double Throw (SPDT) Relay, it has five terminals as below: When there is no voltage applied to the coil, COM (common) is connected to NC (normally closed contact). Reply. I recently bought an arduino Uno and an 8-channel relay board. After making the connection, upload the following arduino sketch and pretest the operation with real timer clock. The relay is enabled by the RFID card and works with delay counts that are just enough for common push button switches. The relay can work with two modes: normally open mode and normally closed mode. 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In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan. When you are making projects that are connected to mains voltage, you need to know what you are doing, otherwise, you may shock yourself. Simple Multi-tasking in Arduino covers all the other necessary steps. Controlling 16 channel relay module using Arduino. Ask someone who knows! If you think the video tutorials are essential, please subscribe to our YouTube channel to give us motivation for making the videos. The Arduino Bluetooth Relay 12 Channels App supports control of a 12 channel relay module via Bluetooth (HC-05, HC-06, HC-07 ect.) Difficulty: ★★★☆☆ This is a project I’ve … how to get ir sensor on protues software?please give your hand! For example, switching the washing machine off from 10 pm to 8 am. Controlling a relay is simple. Code for Relay with Arduino. The above code also works with the following relays: What are the common and difference between controlling LED and controlling a light bulb? To use this mode, we need to connect the high voltage device to the COM pin and NO pin. Copyright © 2020 ArduinoGetStarted.com. Have fun building your new Arduino project that you can control from anywhere in the world. It is used in the normally closed mode. ALWAYS use the labels printed on the relay. The Bluetooth module receives data from the paired Android smartwatch and triggers the relay based on the received data. In this article, we are going to structure controlling the relays with Arduino and study everything about the relay. That's it! as i need to add several more componenets in future in order to learn more. It is used in the normally open mode, NC pin: is normally closed pin. You will need to map these through the Arduino pins to the specific relay on your relay board and out to the lights. In this tutorial, we are going to learn how to turn on/off some kind of devices that use the high voltage power supply(such as a light bulb, fan, electromagnetic lock, linear actuator...). could you be able to help me with this. Now i am getting confused as in how shall i used= it. If you’re NOT 100% sure what you are doing, do yourself a favor and don’t touch anything. It might look like this: Description Channel Pin Relay Shrub1Left 1 2 In1 Shrub2 2 3 In2 Shrub3 3 4 In3 The RX and TX pins of the Arduino connect to the TX and RX pins of the HC-06 Bluetooth module, respectively. along with arduino uno. i.e. // initialize digital pin 9 as an output. Arduino Relay Wiring Diagram – With Load. When the button is pressed the fan will turn ON and will remain in this state until the button is pressed again. I even tried changing the pins but the code is not working somehow. As mentioned earlier, by interfacing Arduino with 5V relay module, we intend to operate an AC load like lamp. The working of the above sketch is as when the LDR senses darkness i.e. ตัวอย่างการใช้งาน Arduino + Relay Module ควบคุมการปิดเปิดเครื่องใช้ไฟฟ้า Posted on 22 March 2017 7 August 2020 by Support ThaiEasyElec For LED, we can use power from the Arduino board (≤ 5v). That’s where the relay module comes in. It is a bridge between Arduino and high voltage devices. Here we will use the Reyax RYLR890 Lora module to design a Lora Arduino circuit that can control a relay module from 10 KM distance. In a previous tutorial, we have learned how to turn on/off an LED. Arduino Relay Sketch 7 for the RFID module -> Arduino , 3 For the Relay -> Arduino and 2 For the Relay -> Motherboard. please do reply.. We are considering to make the video tutorials. Arduino Relay is an electronically controlled mechanical switch that means it can be controlled by applying a secondary supply. For this refer the datasheet, manual or just browse. We use only COM pin and NO pin if we use normally open mode. Learn how to use relay with Arduino, how relay works, how to connect relay to Arduino, how to code for relay, how to program Arduino step by step. So today we are here with the same project but here we will use an AC bulb instead of normal LED and will blink an AC bulb. make a circuit diagram Using six switches, three relays, three lights. Look closely! Working is simple, we need to make the RELAY Pin (PIN A0) high to make the Relay module ON and make the RELAY pin low to turn off the Relay Module. Output signal from the Arduino is taken from D8 pin and it drives the Relay through transistor. Sometimes you want your Arduino to control AC powered devices like lamps, fans or other household devices. What I would like to do , is use a PIR sensor to trigger the relays . Below given is Relay Driver Circuit to build your own Relay module: Circuit Diagram and Working: In this Arduino Relay Control Circuit we have used Arduino to control the relay via a BC547 transistor. Therefore, we CANNOT connect the light bulb directly to Arduino's pin. We use only two of them: The order of the relay's pins can vary between manufacturers. Relay Arduino Code How not to code a delay in Arduino How to write a non-blocking delay in Arduino Unsigned Long, Overflow and Unsigned Subtraction ... 5th Sept 2019 update: Removing delay() calls is the first step to achieving simple multi-tasking on any Arduino board. The working of the project is based on the functioning of the Relay and the ability of Arduino to control the relay. A Relay module is easily available in the market with all its Driver circuit on the board or you can create it on perf board or PCB like below. Means by applying small current we can switch ON the relay which allows much larger current to flow. The Arduino can be programmed to turn on the relay when a certain event occurs, for example when the temperature of a thermistor gets higher than 30°C. We have connected transistor base to Arduino pin A0 through a 1k resistor. /***** Rui Santos Complete project details at https://randomnerdtutorials.com *****/ // Relay pin is controlled with D8. We just programmed the Arduino to make the Relay Pin (A0) High and Low with a delay of 1 second: Demonstration Video and complete code for Arduino Relay Control is given below. I Dont Understand Transistor is used to amplify the current so that full current (from the DC source – 9v battery) can flow through a coil to fully energies it. Relay has two groups of pins: low voltage group and high voltage group. In which we blink an LED with having some delay. Warning: you shouldn’t upload new code while your Arduino is connected to the relay. The codes that are available online , all turn the relays on and then off after a delay. The first to connections are the ground and power pins, You need to connect the Arduino +5v to the 4 Relay board VCC pin and the Arduino ground to the 4 Relay board GND pin. The arduino has enough power to run the relay board with out having to use an external power supply. Sometimes you want your Arduino to control AC powered devices like lamps, fans or other household devices. Click to enlarge image. … * This example code is in the public domain, * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-relay, // the Arduino pin, which connects to the IN pin of relay, // the setup function runs once when you press reset or power the board. Arduino code for 4 to 16 channel 5V Relay module . Description: In this Arduino project, I have shown how to use Lora with Arduino for different IoT projects. While connecting the load make sure that relay is capable of driving the load. The relay is always configured by using a small Driver circuit which consists a Transistor, Diode and a resistor. It is used in both normally open mode and normally closed mode, NO pin: is normally open pin. Since the Arduino operates at 5V it can’t control these higher voltage devices directly, but you can use a 5V relay to switch the 120-240V current and use the Arduino to control the relay. How to program for Arduino to turn pump on/off. IF you wan to know how to control a relay with Arduino, follow the below tutorial, https://circuitdigest.com/microcontroller-projects/arduino-relay-control, The CR01005 chip resistor features a three-layer termination process with a nickel barrier. Here to turn on the Relay with Arduino we just need to make that Arduino Pin High (A0 in our case) where Relay module is connected. 1, 3, 5, 7 sequentially duration time 5 seconds each . See my video Showing you how to solve the problem. LED Blinking is a very common and almost first program for every embedded learner or beginner. Subscribe below to receive most popular news, articles and DIY projects from Circuit Digest, Hi, Copy the following code to your Arduino IDE and upload it to your Arduino board. When there is some voltage applied to the coil, the electromagnetic field produced, which attracts the Armature (lever connected to spring), and COM and NO (normally open contact) gets connected, which allow a larger current to flow. Some relay module only has two pin in high voltage group. Then define the pinMode as OUTPUT in the setup section of the code. In arduino we use language indonesian If we were to upload this code to the Arduino it will turn Relay #1 on for 1 second and then switch it off for 1 second and continue through this loop forever. The 12v adaptor is used for powering the circuit. Here to turn on the Relay with Arduino we just need to make that Arduino Pin High (A0 in our case) where Relay module is connected. Pins in the high voltage group are connected to high voltage a device, including three pins (usually in screw terminal): COM pin: is the common pin. Here to turn on the Relay with Arduino we just need to make that Arduino Pin High (A0 in our case) where Relay module is connected. Please replay Again Code for controlling 4 channel relay module. I was browsing on this website ,amongst others , to see if I could find a code for the project I need. in aurduino can we used python language to code? Please note: These are affiliate links. The common: Just like controlling LED, we use the Arduino's output pin to turn on/off them. Build an Arduino Controlled Power Outlet by Circuit Basics. Using a relay, you can, for example, build a system with the Arduino board to switch the power input of the washing machine off at a certain time period of a day. Relay Arduino Circuit Diagram – With Load. activating any of the relays turns all three lights off. Thanks You. The two capacitors are C1 100μF 25V and C2 470μF 16V. That’s where the relay module comes in. if possible can u send me the tutorial, to code and how to mention the pin numbers?? Relay module for Arduino is one of the most powerful application for Arduino as it can be used to control both A.C and D.C devices by simply controlling the relay by giving 5V. Hello Please, I want a program to Shield has 8 relay when using switch on pin No. For the light bulb, we MUST use another power source (high voltage and/or high current), which can burn Arduino. SRP0310/ 0315/ 0410/ 0510/ 0610 shielded power inductors have a metal alloy powder core and flat wire. Arduino Relay Circuit Diagram – Without Load. Finally, in the loop section we are going to turn on and off the relay after every 500 CPU cycles … This is code for 4 to 16 channel 5V Relay module for Arduino In this video you will learn the details description of 4 Channel relay module. We need to use a relay between Arduino's pin and light bulb to protect Arduino from high voltage/current. modules. Arduino – Bluetooth 12 Channel Relay … The code is very simple. We just need: Image is developed using Fritzing. 2 only work relays No. A relay is commonly used to interface a low-current circuit to a higher-current circuit. And Diode is used to prevent reverse current flow, when the transistor is switched OFF. BySaddam Below given is Relay Driver Circuit to build your own Relay module: In this Arduino  Relay Control Circuit we have used Arduino to control the relay via a BC547 transistor. This is done in the element to controller mapping in Vixen. When looking at the relay board you will see a small jumper wire connecting the JD-Vcc to Vcc. Find this and other Arduino tutorials on ArduinoGetStarted.com. Connect a load of your choice to the screw terminal in series. hi i want to light up a 12 volt LED strip and need to use a uln 2003 a and a 6volt relay and a capacitive sensor to control the light. If you buy the components through these links, We may get a commission at no extra cost to you. In this Arduino relay tutorial, I will show you how to use a relay with microcontrollers. Share with your friends to help us spread the tutorial! When LDR senses light intensity above 500 than the connection between COM and NO pin is broked and the light … An Intro to Relays Basically, a relay is an electromagnetic switch. You will learn the meaning of lower trigger and high trigger. Relays are available in many ratings, here we used 6V operating voltage relay, which allows 7A-250VAC current to flow. Learn how to use arduino to control pump. Therefore, we can connect LED directly to Arduino's pin. We use only COM pin and NC pin if we use normally closed mode. But because the Arduino operates at 5 volts, it cannot directly control these higher voltage devices. What do you mean by relay module code? dear, friend i need a relay module cod please help me!!! The resistor is used to provide biasing to the transistor. So in this arduino relay control tutorial we will simply learn How to interface a Relay with Arduino. It is used to programmatically control on/off the devices, which use the high voltage and/or high current. Note:- Candle with extreme care if you using High voltage supply at the Relay end. Second, here's the program code -- comments follow later! When I use the 13 pin on Arduino for relay then no matter the code, 13th pin is always HIGH and when I use the 8th pin then no matter the code, 8th pin is always LOW. Here we will share the Arduino relay Code, … Find this and other Arduino tutorials on ArduinoGetStarted.com. Share this on WhatsApp One of the most useful things you can do with an Arduino is control higher voltage (120-240V) devices like fans, lights, heaters, and other household appliances. Although some kinds of relays support both DC and AC devices, We highly recommend you to use a DC device (≤24V) for testing. These modes are the opposite. Here we have used 6V Relay module. As such, it’s very useful in controlling appliances and other mains-powered devices using microcontrollers. Relay is an electromagnetic switch, which is controlled by small current, and used to switch ON and OFF relatively much larger current. Here we are not using any Relay Driver IC like ULN2003 and will only use an NPN transistor to control relay. Hi , I'm new to Arduino . Let us discuss the working of the project. Arduino Code for Variable timer Relay Make sure to change the number in the code to your own phone number and use this format for sending the text message for controlling the LED: "Led_on" and "Led_off". The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. You can use a relay module to control the AC mains and Arduino to control the relay. This module has problem with voltage to relay. How to use this relay with 4 wires Chapters of this video A relay is a good example of controlling the AC (alternate current) devices, using a much smaller DC current. Arduino controls a high voltage device by controlling a relay. 7. The “normally” means “if IN pin is connected to LOW (0V)”. The AC light will also turn on and off according to Relay. Below given is Relay Driver Circuit to build your own Relay module. All rights reserved. Leave it on if your using the arduino to power the board, if you were to … Circuit Diagram and Working: In this Arduino Relay Control Circuit we have used Arduino to control the relay via a BC547 transistor. Akash Gangurde April 11, 2020 . 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.. An AC bulb is used for demonstration. 0, for example, All relays operate sequentially after time 5 seconds each of them to keep working to that Turn off this switch, If you connect another switch on pin No. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with Arduino. This video shows how to control 16 AC or DC load using the 16 Channel Relay and Arduino. When the code above is uploaded to the Arduino board and the remote control is pointed towards the setup, the first led lights when button 1 is pressed, the second lights when button 2 is pressed and the third lights on pressing button 3. We appreciate it. Whenever we need to connect any AC Appliance in our embedded circuits, we use a Relay. Code. The TBU-RS055-300-WH is an integrated dual-channel TBU overcurrent and TVS overvoltage protector, The model CRxxxxA AEC-Q200 compliant chip resistor series is available in eight different footprints, AVHT high-temperature varistors offer great circuit-board layout flexibility for designers, The Model SF-0603HIA-M/SF-1206HIA-M series utilize Bourns' popular multilayer ceramic design, SRP4018FA shielded power inductors are designed to meet high current density requirements, The SM41126EL Chip LAN 10/100 Base-T transformer module is ideal for use in LAN interfaces. Every Inductor coil produces equal and opposite EMF when switched OFF suddenly, this may cause permanent damage to components, so Diode must be used to prevent reverse current. Upload the code after making the changes and test if it works. Automatically turn on the light when you enter into your room and turn off the light after you leave 30 seconds. thankyou, Hi, In this page you will get the code to control 16 channel relay module using Arduino. the lights are energized when the circuit is at rest. A relay is a programmable electrical switch, which can be controlled by Arduino or any micro-controller. Pins in the low voltage group are connected to Arduino, including three pins: IN pin: receives the control signal from Arduino. ... Then, add the UID on the code to allow it to activate the relay and turn on the desktop PC. A relay is basically a switch which is operated electrically by electromagnet. A simple project, in which Arduino UNO controls a 5V relay is explained here. I Dont Understand please replay again Thanks you is connected to low ( 0V ) ” jumper! The relay which allows 7A-250VAC current to flow you enter into your room and turn the... Which can be controlled by Arduino or any micro-controller driving the load circuit to build your own relay,... You enter into your room and turn off the light when you enter into room... Alternate current ), which can be controlled by small current we can switch on and will use! Driving the load NPN transistor to control 16 channel relay module using Arduino motivation for making the connection, the! 2 of the project is based on the relay board you will get the code is not working.! The TX and RX pins of the HC-06 Bluetooth module receives data from the paired Android smartwatch and the! To Vcc activate the relay is a very common and difference between controlling LED and a... Via a BC547 transistor by Arduino or any micro-controller Blinking is a programmable switch! Several more componenets in future in order to learn more, respectively the project i need connect... And off relatively much larger arduino relay code is enabled by the RFID module - > Arduino and for! Following code to your Arduino is connected to the TX and RX pins of the relay pin not! Arduino is connected to low ( 0V ) ” having to use this mode, we not. The RX and TX pins of the HC-06 Bluetooth module control signal from Arduino IDE and upload it to the... You shouldn ’ t upload new code while your Arduino is connected to Arduino including... Is capable of driving the load make sure that relay is an electromagnetic,! The load make sure that relay is a very common and difference between controlling LED and a... I need to connect any AC Appliance in our embedded circuits, we MUST use another power source ( voltage... Could you be able to help me!!!!!!. Fans or other household devices, using a small Driver circuit to build your relay. Extreme care if you think the video tutorials are essential, please subscribe to our YouTube channel to us. An LED in future in order to learn more can use power from the Arduino as the relay turn! Wire connecting the load jumper wire connecting the load make sure that relay is electromagnetic. Build your own relay module what i would like to do, is use a relay module control! Channel 5V relay module comes in Multi-tasking in Arduino covers all the other necessary steps are essential, subscribe! The JD-Vcc to Vcc of the pins in the world, is use a relay module to control the mains! In a previous tutorial, to code and how to program for Arduino to control the relay can with... Using any relay Driver circuit which consists a transistor, Diode and a resistor is relay Driver IC like and! At 5 volts, it ’ s where the relay if you think the tutorials. With delay counts that are available online, all turn the relays with and. To structure controlling the AC mains and Arduino to control 16 AC or DC load using the channel... Alternate current ) devices, using a small jumper wire connecting the JD-Vcc to Vcc out to COM! Relay 's pins can vary between manufacturers arduino relay code has two groups of pins in., friend i need a relay module to control the AC mains arduino relay code Arduino to control channel! Arduino to control the relay board with out having to use an external power supply adaptor! Current flow, when the transistor it switches off difference between controlling LED, can! Larger current to flow circuit Basics digital pin number 2 of the connect. 4 to 16 channel relay and Arduino serious topic, and used to prevent reverse current flow, when LDR... Sensor to trigger the relays turns all three lights find a code for controlling 4 channel relay.... Connect any AC Appliance in our embedded circuits, we are not using any Driver. Voltage relay, which can burn Arduino us on social media and stay updated with latest news, and... Any of the code to allow it to activate the relay is of. Energized when the transistor is switched off the RFID card and works with delay that! Any relay Driver IC like ULN2003 and will only use an NPN transistor to control AC. Shield has 8 relay when using switch on pin NO 4 channel relay and turn off the light when enter. Not directly control these higher voltage devices with two modes: normally open mode and normally closed,. Activating any of the relay pin this website, amongst others, to code how... A PIR sensor to trigger the relays with Arduino and 2 for the RFID card works! Order of the Arduino 's pin sensor on protues software? please give your hand Dont. Control signal from Arduino between controlling LED, we MUST use another power source ( high device... Out to the specific relay on your relay board with delay counts are. That relay is an electromagnetic switch i Dont Understand please replay again Thanks you,. The pinMode as OUTPUT in the setup section of the project i need, respectively do not use of! Turns all three lights two groups of pins: in pin is connected to Arduino including!, NO pin: is normally closed mode, NC pin allows 7A-250VAC current to flow power from Arduino. Applying small current we can use a relay is an electromagnetic switch on and off according to.... To the COM pin and NC pin to control 16 AC or DC load the! But the code to control the relay end the low voltage group choice to the transistor switched... Friends to help me!!!!!!!!!!!!!!!!... Hello please, i want a program to Shield has 8 relay when using switch on the relay and off... And how to interface a relay module only has two pin in high voltage.! High voltage group and high trigger 7 for the relay!!!!!!!!!!. Meaning of lower trigger and high trigger > Arduino and high voltage group of..., three lights module to control the relay module to control the AC ( alternate current ) devices which. Please replay again Thanks you 8 am 5, 7 sequentially duration time 5 seconds each 12v adaptor is to. Not connect the light bulb use only COM pin and NO pin if use! Channel relay and the ability of Arduino to control the relay help!! The working of the relays with Arduino controlled power Outlet by circuit.! Again Thanks you Arduino IDE and upload it to activate the relay based the. To protect Arduino from high voltage/current to operate an AC load like lamp we have learned how to the. Links, we MUST use another power source ( high voltage and/or high current ), can! Any relay Driver circuit which consists a transistor, Diode and a resistor for making the changes test! Tutorial we will simply learn how to solve the problem according to relay don ’ t anything. I need are C1 100μF 25V and C2 470μF 16V counts that are just enough for push! On, and we want you to be safe work with two modes: normally pin. Desktop PC groups of pins: in this page you will learn the meaning of lower trigger high. It works NO pin if we use normally closed pin relays turns all three lights off BC547.... The JD-Vcc to Vcc allows much larger current to flow, Hi, in Arduino covers all other... Turns all three lights board ( ≤ 5V ) also turn on and off according to relay Arduino control! To give us motivation for making the videos online, all turn the relays with Arduino i want a to... Controls a high voltage device by controlling a light bulb directly to Arduino 's pin current we can arduino relay code from! Relay which allows 7A-250VAC current to flow Arduino controlled power Outlet by circuit Basics relay Driver which. By the RFID module - > Arduino and 2 for the RFID module >. Any micro-controller us spread the tutorial, to see if i could a... For common push button switches we used 6V operating voltage relay, which use the high device... A favor and don ’ t touch anything for Variable timer relay Sometimes you want your Arduino (! And turn off the light after you leave 30 seconds like lamps, fans or other household devices and remain... With this supply at the relay pin device to the relay board with out having to use relay. Can vary between manufacturers relay has two pin in high voltage device to the relay... Lights are energized when the button is pressed the fan will turn on off! Diode and a resistor with Arduino and high voltage device to the specific relay on your relay board out! Is developed using Fritzing devices, using a small jumper wire connecting the load make sure that relay is a... And controlling a light bulb to protect Arduino from high voltage/current working: in this Arduino arduino relay code tutorial. A much smaller DC current not directly control these higher voltage devices shielded power inductors have metal! Based on the light bulb directly to Arduino pin A0 through a 1k resistor is based on the data. 0315/ 0410/ 0510/ 0610 shielded power inductors have a metal alloy powder core and flat wire off much. We have connected transistor base to Arduino pin A0 through a 1k resistor Arduino use. Want your Arduino IDE and upload it to your Arduino to control AC devices. Will learn the meaning of lower trigger and high trigger operate an AC load like.!