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Scratch Robots Motor Controller. Tools Radio Shack Tools $ 9.00 – Test Jumpers $ 3.00 – Screw driver $ 7.00 – Wire Strippers $ 20.00 – Multimeter --------------------------

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Presentation on theme: "Scratch Robots Motor Controller. Tools Radio Shack Tools $ 9.00 – Test Jumpers $ 3.00 – Screw driver $ 7.00 – Wire Strippers $ 20.00 – Multimeter --------------------------"— Presentation transcript:

1 Scratch Robots Motor Controller

2 Tools Radio Shack Tools $ 9.00 – Test Jumpers $ 3.00 – Screw driver $ 7.00 – Wire Strippers $ – Multimeter $ Total Scratch Robots Motor Controller Tools

3 Scratch Robots 3-state Motor Controller Radio Shack Parts $ 9.00 – 1-1/8 Modular IC Breadboard $ Photo Resistors $ Gauge Hookup Wire $ K Potentiometer x2 $ V connector $ 4.00 – 1A, 30V diode x 4 $ V battery $27.00 – Sub Total Pololu Part pololu.com/catalog/product/24 $ 3.00SN Quadruple Half-H Driver Geared Motor hobbyengineering.com/H2028.html $10.00Several Tamiya options $40.00 Total Parts Motor Controller Circuit Board pictures

4 Scratch Robots 3-state Motor Controller +9V R1 Photo resistor 2K light 50K dark R2 10K R3 R4 7 8,16 4,5,12, R5 10K 5V to 9V DC Motor 1A D1 1A 30V D4 D2 D3

5 Scratch Robots 3-state Motor Controller Truth Table: Light Sensor R1BlackWhiteBlackWhite Light Sensor R2BlackBlackWhiteWhite Motor StateOffRightLeftOff Wish List: 1)Make a printed circuit and solder parts 2)Add clockwise, counter clockwise lamp 3)Add on/off lamp 4)Add on/off switch 5)Research geared motors and shaft accessories

6 Radio Shack Parts $ 9.00 – 1-1/8 Modular IC Breadboard $ IRF510 N-channel MOSFET $ Photo Resistors $ Gauge Hookup Wire $ K Potentiometer $ V connector $ V battery $ Total Motor Controller Circuit Board When the light sensor sees black, the motor is OFF. When the light sensor sees white, the motor is ON Scratch Robots On/Off MOSFET Motor Controller

7 +6V to 9V S DG 5V to 9V DC Motor 1A R1 Photo resistor 2K Ohms light (on) 50K Ohms dark (off) R2 10K Scratch Robots V Gate On/Off MOSFET Motor Controller

8 Q1 IRF510 N-channel MOSFET 2V-4V GS trigger voltage 20V GS Max voltage 4A DS current G – Gate D – Drain S – Source Radio Shack Breadboard MOSFET On/Off Controller Build-It-Yourself +6V to 9V S DG 5V to 9V DC Motor 1A R1 Photo resistor 2K Ohms light (on) 50K Ohms dark (off) R2 10K If the voltage between the Gate and Source, V Gate, of this N-channel MOSFET 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 4 volts. Then the motor will run. Scratch Robots V Gate On/Off MOSFET Motor Controller

9 R2 Variable Resistor 9V R1 Photo Resistor V Gate V Gate 9V 10K 4K(light)+10K V Gate = 6.4V = V Gate 9V R2 R1+R2 = V Gate 9V 10K 16K(dark)+10K V Gate = 3.4V = Voltage Divider (FET Gate Bias Control) Scratch Robots MOSFET Motor Controller

10 Test NO.Min R (K Ohm) Max R (K Ohm) Medium R, Gray (K Ohm) The Problem: In a package of 6 light sensors, the resistance varies significantly. Note: Test No. 1, 3, 6 have the same physical size. Their resistance ranges are closer to each other than to other three. For 1, 3 and 6, the thresholds may be set, i.e. to 10 K Ohm and 25 k Ohm. Updated 10/05/2010 Standard Radio Shack Light Sensor package of 6. Min ohms - WhiteMed ohms - GreyMax ohms - Black


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