Light-seeking robot

Posted on May 4, 2012

The circuit is light seeking; it will follow a flashlight around a darkened room. A pair of photocells determine the direction in which the robot will move. Each photocell is connected to an op amp configured as a comparator. When sufficient light falls on photocell R2, the voltage at the inverting input (pin 6) of ICl-a will fall below the voltage at the non-inverting input (pin 5), so the output of the comparator will go high, and transistors Ql and Q2 will turn on. That will enable relays RY1 and RY2, and thereby provide power for the right motor.

Light-seeking robot
Click here to download the full size of the above Circuit.

The robot will then turn left. Likewise, when light falling on R3 lowers its resistance, Q2 and Q3 will turn on, the left motor will energize, and the robot will turn right.

Leave Comment

characters left:

New Circuits



Popular Circuits

Disco Smoke controller
Enlarging Light Meter Circuit
70w stk amplifier schematic
Arduino Producing DTMF Tones
Phone Line Polarity Checker
wein bridge sine wave oscillator lm101
power supply am farm radio
Simple Lightning Detector Circuit
1N4001 Diodes
Voltage Controlled Frequency Divider with Variable Division Ratio