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Arduino relay light10/4/2023 ![]() The entire circuit is powered at 5V (use a 5V Arduino board). You must pay attention to mains voltages that can be controlled by the relay. * * Arduino powered light/dark activated switch * Copyright (C) 2017 One Transistor * Licensed under GNU General Public License v3 */ #include // Pins for photoresistor, relay and encoder const int sensorPin = A3 // A3 const int relayPin = 4 // D4 const int encoderA = 2 // D2 const int encoderB = 5 // D5 const int modeSwitchPin = 3 // D3 // Change that will be considered significant in read value const int valueThreshold = 20 const int rotaryEncoderStep = 10 int sensorValue = 0 volatile unsigned int sensorThreshold = 512 volatile byte modeSwitch = 0 // 0 = always off, 1 = always on, 2 and 3 = dark or light activated switch void setup ( ) I recommend using the sketch from GitHub because this is more often updated. Data from an Arduino triggers a relay, which in turn switches a high-voltage connection on or off. The photoresistor should look to outdoor lighting, while the relay will turn on indoor lights. Otherwise the switch will run an endless loop of turning on and off the light. If you will build this to turn on the light in a room, make sure the light you turn on does not get to the photoresistor. If the value is rather constant, the relay is activated or not on pin D4. The analog value from photoresistor is sampled on pin A3 twice in 0.5 seconds. The rotary encoder and its switch are connected to D2 respectively D3 pins and use interrupts to change program variables. I designed this using a Nano board, but if you want a standalone device, there is no need for USB port, so you should use the smaller Pro Mini board. The threshold and mode of operation are stored inside MCU EEPROM and these variables are restored when powering up the device.Īrduino light/dark switch with rotary encoder The rotary encoder allows changing the switching threshold (rotation) and cycling through the four modes of operation: always off, always on, light activated relay and dark activated relay. Depending on this value and the user configurable threshold and mode of operation, the relay is activated or not by a digital output of the MCU. The output voltage from a divider formed by a photoresistor and a fixed resistor is read by an analog input pin of the microcontroller (MCU). The following code will allow you to use a button to control a relay with the Arduino.The working principle is rather simple. You have been warned! Code for Using a Button to Control a Relay If you don’t have experience with it, we recommend you do not do this project or that you seek additional expert help. ![]() Warning: Mains voltage can seriously injure or even kill you. In this wiring example, we’re showing how you could control a 110v/220v light bulb using an Arduino with a relay module. Next up in our mission to control a relay with a button, it is time to wire everything up on the breadboard. Wiring Diagram : Control a Relay with a Button If you use them, they cost you nothing, but we may get a small commission that helps us keep building awesome content like this. Some of these links may be affiliate links. The remote-controlled switches are built around momentary switches, so there is no 'mechanical memory. ![]() Whenever people talk about replacing (or supplementing) a light switch with a relay, I suggest a uhome automation/usolution. The transmitting LED converts the modulated electrical signal into a modulated IR light signal. 3 Sorry, I'm not clear on what you have or what you want to accomplish. Here’s a handy parts list for this project. This electrical signal is sent to the transmitting LED. For example, we can control traditional incandescent light bulbs, a high power motor, a servo actuator, or even a regular household appliances such as a coffee pot or a vacuum cleaner. We’re going to cover that in the next tutorial! Just know that when the Arduino activates it, it works like a switch: turning some other device On or Off.īy using a relay, we can control all kinds of high voltage or high current devices from the Arduino. 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. In which we blink an LED with having some delay. RELATED: Control a Relay with a Light Sensorĭon’t worry too much about how a relay works. Arduino Relay Control Tutorial LED Blinking is a very common and almost first program for every embedded learner or beginner. This is a very similar tutorial to our button LED control tutorial, but with a relay! The main difference being that a relay will allow you to control something of higher voltage than the Arduino can control directly. In this Arduino tutorial, we’re going to learn how to control a relay with a button.
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