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Transcript
Scratch Robots Motor Controller Motor Controller Circuit Board When the light sensor sees black, the motor is OFF. When the light sensor sees white, the motor is ON 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 www.build-it-yourself.com Scratch Robots MOSFET Motor Controller Tools Radio Shack Tools $ 9.00 – Test Jumpers $ 3.00 – Screw driver $ 7.00 – Wire Strippers $ 20.00 – Multimeter -------------------------$39.00 - Total www.build-it-yourself.com 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 R2 10K D S www.build-it-yourself.com 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 R2 10K D S Q1 IRF510 N-channel MOSFET 2V-4V GS trigger voltage 20V GS Max voltage 4A DS current G – Gate D – Drain S – Source 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. www.build-it-yourself.com Radio Shack Breadboard MOSFET On/Off Controller Build-It-Yourself Scratch Robots MOSFET Motor Controller Voltage Divider (FET Gate Bias Control) 9V R1 Photo Resistor VG VG R2 9V = R1+R2 VG 10K = 9V 4K(light)+10K VG = 6.4V R2 Variable Resistor VG = 9V 10K 16K(dark)+10K VG = 3.4V www.build-it-yourself.com