Here’s a circuit diagram that can be switched as the light and dark sensor… This example uses an LM358 dual-operational amplifier IC. As per the above circuit, the output of the LDR-resistor ...

The varying resistance of the LDR is converted to a varying voltage that the analog pin of the Arduino will then be using in its logic. Connect the 3.3v output of the Arduino to the positive rail of ...

Data Pin: Connect the data pin to digital pin D2 on the Arduino. This pin reads the temperature and humidity data, which we then send to the Blynk app. 3.LDR Sensor (Light Dependent Resistor): The LDR ...

where measurements are done by using either LDR or photodiode sensors. Photo the Arduino board used in the assembly (center). Schematic circuit diagram used (right). Figure 2. Plot of damped hamonic ...

The circuit diagram of the Arduino-based night security light is shown in Fig. 2. It is built around an Arduino Uno board (board1), PIR sensor connected across CON2, two BC547 npn transistors (T1, T2) ...

In this circuit, we are making a Light Sensor using LDR with Arduino to control ... As per the circuit diagram, we have made a voltage divider circuit using LDR and 100k resistor. The voltage divider ...