Welcome to Robotics Fundamentals!<\/strong> In this essential prequel lesson, you’ll be making a basic robot car<\/strong> using Arduino – which will be a great foundation for your coming robotics projects. You’ll learn motor control, chassis assembly, and Arduino programming while creating a manually controlled rover. Mastering this project prepares you for advanced concepts like obstacle avoidance (Lesson 2) and Bluetooth control. No prior robotics experience needed!<\/p>\n\n\n\n <\/p>\n\n\n\n Motor Connections:<\/strong><\/p>\n\n\n\n Power Management:<\/strong><\/p>\n\n\n\n Upload This Arduino Sketch:<\/strong><\/p>\n\n\n\n Key Structures Used:<\/strong><\/p>\n\n\n\n Upgrade Path:<\/strong>
\n\n\n\n2. Components Needed<\/strong><\/h4>\n\n\n\n
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\n\n\n\n3. Hardware Setup<\/strong><\/h4>\n\n\n\n
3.1. Mechanical Assembly<\/strong><\/h5>\n\n\n\n
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3.2. Electrical Connections<\/strong><\/h5>\n\n\n\n
L298N to Arduino:<\/strong><\/p>\n\n\n\nL298N Pin<\/th> Arduino Pin<\/th><\/tr><\/thead> IN1<\/td> D5<\/td><\/tr> IN2<\/td> D6<\/td><\/tr> IN3<\/td> D7<\/td><\/tr> IN4<\/td> D8<\/td><\/tr> 12V Input<\/td> Battery (+)<\/td><\/tr> GND<\/td> Battery (-) & Arduino GND<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n \n
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\n\n\n\n4. Code & How It Works<\/strong><\/h4>\n\n\n\n
\/\/ Motor control pins\nconst int LEFT_FWD = 5; \/\/ IN1\nconst int LEFT_BWD = 6; \/\/ IN2\nconst int RIGHT_FWD = 7; \/\/ IN3\nconst int RIGHT_BWD = 8; \/\/ IN4\n\nvoid setup() {\n \/\/ Initialize all motor pins as OUTPUTs\n for (int pin = 5; pin <= 8; pin++) {\n pinMode(pin, OUTPUT);\n }\n Serial.begin(9600); \/\/ Start serial communication\n}\n\nvoid loop() {\n \/\/ Demo movement sequence\n moveForward(2000); \/\/ Move forward for 2 seconds\n turnRight(1000); \/\/ Turn right for 1 second\n moveBackward(2000); \/\/ Move backward for 2 seconds\n turnLeft(1000); \/\/ Turn left for 1 second\n}\n\n\/\/ Custom movement functions with duration parameter\nvoid moveForward(int duration) {\n \/\/ Left motor forward\n digitalWrite(LEFT_FWD, HIGH);\n digitalWrite(LEFT_BWD, LOW);\n \/\/ Right motor forward\n digitalWrite(RIGHT_FWD, HIGH);\n digitalWrite(RIGHT_BWD, LOW);\n delay(duration);\n}\n\nvoid turnRight(int duration) {\n \/\/ Left motor forward (pivot)\n digitalWrite(LEFT_FWD, HIGH);\n digitalWrite(LEFT_BWD, LOW);\n \/\/ Right motor backward\n digitalWrite(RIGHT_FWD, LOW);\n digitalWrite(RIGHT_BWD, HIGH);\n delay(duration);\n}\n\n\/\/ Add moveBackward() and turnLeft() using similar patterns<\/code><\/pre>\n\n\n\n
\n\n\n\n5. Programming Concepts Explained<\/strong><\/h4>\n\n\n\n
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const int LEFT_FWD = 5; <\/code><\/pre>\n\n\n\n\n
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for (int pin = 5; pin <= 8; pin++) { \n pinMode(pin, OUTPUT); \n }<\/code><\/pre>\n\n\n\n\n
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void moveForward(int duration) { ... }<\/code><\/pre>\n\n\n\n\n
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digitalWrite(LEFT_FWD, HIGH); \/\/ Activate forward motion<\/code><\/pre>\n\n\n\n\n
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delay(duration); \/\/ Pauses program execution<\/code><\/pre>\n\n\n\n\n
\n\n\n\n6. Common Troubleshooting<\/strong><\/h4>\n\n\n\n
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Swap motor wires on L298N terminals (A+ \u2194 A-, B+ \u2194 B-)<\/li>\n\n\n\nanalogWrite(ENA, 200);<\/code> (Need to wire ENA and ENB to PWM control pins-remove the black jumpers if needed)<\/li>\n\n\n\n
\n\n\n\n7. How to Go Further<\/strong><\/h4>\n\n\n\n
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Connect L298N ENA\/ENB pins to Arduino PWM pins (3,5,6,9,10,11) and use analogWrite()<\/code><\/li>\n\n\n\n
Add Bluetooth (HC-05) or RF (nRF24L01) module for remote operation<\/li>\n\n\n\n
Add IR sensors for track navigation<\/li>\n\n\n\n
Program complex sequences like squares, circles, or zig-zags<\/li>\n\n\n\n
Implement voltage sensing with analog pin<\/li>\n<\/ol>\n\n\n\n
This basic robot car becomes the foundation for Lesson 2 (Obstacle Avoidance) <\/a>when you add an HC-SR04 ultrasonic sensor!<\/p>\n\n\n\n
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