HARDWARE REQUIRED 12V Lithium Ion Battery – 1 2 Wheel Chassis Kit- 1 3906 transistor- 2 LDR- 2 Single Stand Wire 2mt - 1 Breadboard 400 pt - 1 CIRCUIT CONNECTION First, we connect both the positive terminals of the BO motor with the positive terminal of 9V Battery (as given in image below). Now connect both the negative terminals of BO motor with the Emitter of 3906 Transistor (as given in image below). Connect both the LDR points with the Pin Base and Pin Collector of 3906 Transistor for further connection. Common connect both the Collector Pins of 3906 Transistor and then connect them to battery negative terminal (GND). Lastly, it should be made sure that all the circuit connections are made in an appropriate manner. WORKING Welcome to the Arduino Based Project LDR Controlled Smart Robot Car which consists of LDR (Light Dependent Resistor) AND 3906 Transistor. Here, the working of the robot car is being shown in which we will provide light over theLDR which changes its resistivity values and makes the motor work and it starts running. One by one you put light on the ldr the robot will start working. Here’s the basic functionality of LDR being described. The LDR is also called a photoconductor which is basically a photocell that works on the principle of photoconductivity. The passive component is basically a resistor whose resistance value decreases when the intensity of light decreases. This optoelectronic device is mostly used in light varying sensor circuit, and light and dark activated switching circuits. Some of its applications include: Camera light meters Street lights Clock radios Light beam alarms Reflective smoke alarms Outdoor clocks