Line Follower Robot-Based LDR

Line follower robot circuit at its core is 2 pieces of current DC motors based on input from sensors LDR, if the white lines mendeksi LDR (light) and black lines (dark) then there will be a change in resistance value of LDR, which will activate / deactivate the transistor 2N3904 . To set the input voltage to the base in order to create a 2N3904 transistor saturation, the voltage divider is used, in this case trimpot / potentiometer 50k-100k. Changes 2N3904 transistor logic will also cause the LED on or off, as an indicator of whether LDR read black line / white. Changes in the collector logic 2N3904 well as input on the basis 2N2907, which will enable / disable the DC motor, which is a 2N2907 transistor switching transistor standard. Consider the following picture: 

 

You can use some of the items used to make these robots, for example using the wheel as the wheel BB Rexona robots. Components and the necessary equipment is complete: 

* 2 pieces LDR light sensor 

* IC PCB hole 

* 2 pieces transistor 2N3904 

* 2 pieces transistor 2N2907 

* 2 pieces Trimpot / potentiometer 50k-100k 

* 2 fruit 3.3K resistors 

* 2 fruit 1K resistor 

* 2 pieces LED (Light-emitting diode Emiting) 

* Spacer (PCB feet) 

* Robot Acrilic body diameter 20 cm. 

* Solder, tin solder and wires sufficiently 

* 6V battery box 

* Wheel marks reliever BB Rexona 

* 2 fruit DC motor with gearbox for GT1 and GT1 wheels 

Or 

* 2 fruit DC motor with gearbox and rubber Wheel GT5 to GT5 (even better) 

* PCB Drill 

* Glue Candle 

* Multitester analog / digital

Assembly 

The steps to assemble the robot is as follows: 

1. Prepare IC PCB holes, then fit and appropriate circuit components solderlah above. 

2. Give 6V voltage, set the light on the LDR provision by opening or closing the LDR surface with fingers or a paper, set trimpot / potentiometer so that the optimal results. This section is the most critical part in making robo tini, because if tuning is not right, aka robots are not suitable path beralan made. 




4. Put the PCB and its supporters acrilic. Connect the cable to the output DC motor PCB. Connected to the input battery 6V Supply PCB. 

 

5. If you've assembled on the floor try to run the already installed curved black lines (can use duct tape), then the robot will follow the path beralan. If the sensor is less sensitive, slowly rotate trimpot / potentiometer robot, for optimal results. LDR Make sure the sensor close enough to the floor. If the motor turns too fast, you can adjust the voltage of the DC motor, for example using a variable regulator IC LM317.