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Make a robot car using LDR and transistor 3906

Category: Robot Car Kits & Accessories Tags: LDR and transistor 3906, Robot Car

Description
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KIT INCLUDES:

HARDWARE REQUIRED

SPECIFICATIONS

TRANSISTOR 3906

Bi-Polar PNP Transistor
DC Current Gain (hFE) is 300 maximum
Continuous Collector current (IC) is 200mA
Emitter Base Voltage (VBE) is 5V
Base Current(IB) is 5mA maximum
Collector Emitter Voltage (VCE) is 40V
Collector Base Voltage (VCB) is 40V
Available in To-92 Package

LDR (Light Dependent Resistor)

A photoresistor or light dependent resistor is a component that is sensitive to light. When light falls upon it then the resistance changes. Values of the resistance of the LDR may change over many orders of magnitude the value of the resistance falling as the level of light increases.

Can be used to sense Light
Easy to use on Breadboard or Perf Board
Easy to use with Microcontrollers or even with normal Digital/Analog IC
Small, cheap and easily available
Available in PG5 ,PG5-MP, PG12, PG12-MP, PG20 and PG20-MP series.

PIN DESCRIPTION

TRANSISTOR 3906

Pin Number	Pin Name	Description
1	Emitter	Current Drains out through emitter
2	Base	Controls the biasing of transistor
3	Collector	Current flows in through the collector

LDR (Light Dependent Resistor)

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

LDR ControlledTransistor Circuit

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