Hi there, i came up with a circuit for a line follower robot which follows a black line. In the circuit i have used a voltage divider using a LDR as the sensor which goes through a 50k variable resistor to the base of a TIP 122 transistor and then to the motor from there. The 50k between the base and the sensor is for regulating the voltage going to the base and to control motor speed and sensitivity. There is another 50k between 2 LEDs and VCC to control brightness of the LEDs. The robot works from 6v to 9v. I have attached a diode to the motor but havent mentioned it in the circuit. I have attached the circuit but really sry for the bad drawing cause i did it in paint. I would like to know is there any mistake in the circuit and whether any changes can be done. Thx in advance and waiting eagerly for replies.
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