LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are ...

Working of LDR controlled LED using Arduino. As per the circuit diagram, we have made a voltage divider circuit using LDR and 100k resistor. The voltage divider output is feed to the analog pin of the ...

Whenever we need to connect any AC Appliance in our embedded circuits, we use a Relay. So in this arduino relay control tutorial we will simply learn How to interface a Relay with Arduino. Here we are ...

Connect the A0 pin of the Arduino to the same column where the LDR and resistor is connected (Since the LDR gives out an analog voltage, it is connected to the analog input pin on the Arduino. The ...

Welcome to the Light Following Robot project repository! This project demonstrates how to build a simple yet effective light-following robot using Arduino and Light Dependent Resistors (LDRs). This ...

Light Activated Switch Circuit Applications. This circuit can be used in security applications like when there is darkness on the LDR, it stops lighting. This can be used in applications where the ...

IC 555 Internal Circuit. Note: LDR should be placed away from the Lamp light but it should get day light. Use 6 Volt PCB relay. Wiring connections are given in the diagrams. PCB Relay and Wiring ...

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) ...

Readings from the LDR are taken by analogue pin A0 using a voltage divider circuit consisting of 10k resistance and LDR connected at CON1 as shown. Arduino Uno has a 10-bit ADC and its value ranges ...