Lots of information can be gleaned from the markings on the relay itself. The second is the relay itself, which, in this case, is a blue plastic case. Adding screw terminals makes it easier to connect thick mains cables, which might be difficult to solder directly. The three connections on the terminal block are connected to the normally open, normally closed, and common terminals of the relay. This is the part of the module that is in contact with mains so a reliable connection is needed. The single-channel relay module is much more than just a plain relay, it contains components that make switching and connection easier and act as indicators to show if the module is powered and if the relay is active.įirst is the screw terminal block. Understanding 5V Single-Channel Relay Module The following are the major components present on a relay module we will get into the details later in this article.ĥV Relay, Transistor, Diode, LEDs, Resistors, Male Header pins, 3-pin screw-type terminal connector, etc. Relay maximum contact voltage – 250VAC or 30VDCĭual-channel relay module, four-channel relay module, 8-channel relay module.Ĭomponents Present on a 5V Single Channel Relay Module.Current when the relay is active: ~70mA.Single-Channel Relay Module Specifications Single-Channel Relay Module Pin Description Now, test out the sensor by blocking its surface from light and see what values you get on the serial monitor.Relay is an electromechanical device that uses an electric current to open or close the contacts of a switch. The single-channel relay module is much more than just a plain relay, it comprises of components that make switching and connection easier and act as indicators to show if the module is powered and if the relay is active or not. This will open a new window, which prints different values on the screen. Serial.println(sensorValue) //prints the values coming from the sensor on the screenĪfter uploading the code, click the button on the Arduino IDE called “Serial monitor". SensorValue = analogRead(sensorPin) // read the value from the sensor Serial.begin(9600) //sets serial port for communication Int sensorValue = 0 // variable to store the value coming from the sensor Int sensorPin = A0 // select the input pin for LDR Next, paste this code and upload it to your Arduino: To do this, connect the Arduino via USB to your PC and open up the Arduino IDE or software. Testing the Code for the Arduino LDR SensorĪfter connecting the LDR to your Arduino, you can check for the values coming from the LDR via the Arduino. A 100K resistor is also connected to the same leg and grounded. One leg of the LDR is connected to VCC (5V) on the Arduino, and the other to the analog pin 0 on the Arduino. When there is sufficient light in its environment or on its surface, the converted digital values read from the LDR through the Arduino will be in the range of 800-1023. The Arduino, with its built-in ADC (analog-to-digital converter), then converts the analog voltage (from 0-5V) into a digital value in the range of (0-1023). Since the LDR gives out an analog voltage, it is connected to the analog input pin on the Arduino. That is, the greater the intensity of light, the greater the corresponding voltage from the LDR will be. The LDR gives out an analog voltage when connected to VCC (5V), which varies in magnitude in direct proportion to the input light intensity on it. It's inexpensive, and you can buy it from any local electronics store or online. The sensor that can be used to detect light is an LDR. This system works by sensing the intensity of light in its environment. We can take advantage of this LDR property and use it in our DIY Arduino LDR sensor project. The LDR is a special type of resistor that allows higher voltages to pass through it (low resistance) whenever there is a high intensity of light, and passes a low voltage (high resistance) whenever it is dark. In order to detect the intensity of light or darkness, we use a sensor called an LDR (light dependent resistor). Related Article: Arduino: Three Powerful Yet Overlooked Uses Use it to automatically turn a light on when there isn’t sufficient light in a room. You can even use this as an emergency lighting system. Whenever a room gets dark due to a fused bulb or any other factors, a light bulb automatically turns on. Wouldn’t it be cool if we could eliminate darkness? In this Arduino project, I have posted a very simple project that focuses on eliminating darkness.
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