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Build Your Own Light-Activated Motor Controller with MOSFET Technology

Create an innovative motor controller that operates based on light detection using a photoresistor and an N-channel MOSFET. When the light sensor detects black, the motor turns OFF; when it detects white, the motor turns ON. This project requires components like an IRF510 MOSFET, photo resistors, a 10K potentiometer, a 9V battery, and a modular IC breadboard, totaling around $24 in parts. The assembly includes essential tools such as wire strippers and a multimeter. Ideal for DIY enthusiasts and robotics projects.

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Build Your Own Light-Activated Motor Controller with MOSFET Technology

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  1. Scratch Robots Motor Controller

  2. When the light sensor sees black, the motor is OFF. When the light sensor sees white, the motor is ON Motor Controller Radio Shack Parts $ 9.00 – 1-1/8” Modular IC Breadboard $ 2.00 - IRF510 N-channel MOSFET $ 3.00 - Photo Resistors $ 3.00 - 22 Gauge Hookup Wire $ 1.50 - 10K Potentiometer $ 3.00 - 9V connector $ 2.50 - 9V battery -------------------------- $24.00 - Total Circuit Board www.build-it-yourself.com

  3. Scratch Robots MOSFET Motor Controller Radio Shack Tools $ 9.00 – Test Jumpers $ 3.00 – Screw driver $ 7.00 – Wire Strippers $ 20.00 – Multimeter -------------------------- $39.00 - Total Tools www.build-it-yourself.com

  4. Scratch Robots MOSFET Motor Controller +6V to 9V R1 Photo resistor 2K Ohms light (on) 50K Ohms dark (off) 5V to 9V DC Motor 1A G D R2 10K S www.build-it-yourself.com

  5. Scratch Robots MOSFET Motor Controller +6V to 9V R1 Photo resistor 2K Ohms light (on) 50K Ohms dark (off) 5V to 9V DC Motor 1A Q1 IRF510 N-channel MOSFET 2V-4V GS trigger voltage 20V GS Max voltage 4A DS current G – Gate D – Drain S – Source G D R2 10K S If the voltage between the Gate and Source of this N-channel MOSFET is < 2 volts, no current can flow between the Drain and Source terminals. The motor will not run. If the Gate to Source voltage is > 4 volts, then current will flow between the Drain and Source and the motor will run. Adjust R2 so motor is off when R1 sees no light. The Gate voltage should be < 2 volts. When R1 sees light, its resistance should decrease raising the Gate voltage > 4 volts. Then the motor will run. Radio Shack Breadboard MOSFET On/Off Controller Build-It-Yourself www.build-it-yourself.com

  6. Scratch Robots MOSFET Motor Controller Voltage Divider (FET Gate Bias Control) 9V VG 9V R2 R1+R2 = VG 9V 10K 4K(light)+10K VG = 6.4V R1 Photo Resistor = VG R2 Variable Resistor VG 9V 10K 16K(dark)+10K VG = 3.4V = www.build-it-yourself.com

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