Mini Cat Line Follower Tracking Robot Unassembled Kit DIY

Specifications

• Logic Architecture: Analog D2-1 (No Microcontroller/Coding required).
• Core IC: LM393 Voltage Comparator.
• Sensors: 2x Infrared (IR) Emitter-Receiver pairs.
• Drive System: 2x DC Gear Motors (Reduction Ratio 1:48).
• Power Source: 2x AA Batteries (Holder included, Batteries sold separately).
• Chassis Material: Transparent Acrylic (Remove protective film before assembly).
• Assembly Method: Soldering Required (Through-hole components).
• Dimensions: ~150X140X80mm

Applications

• First Soldering Project: The PCB has clearly labeled footprints and widely spaced pads, making it the ideal canvas for learning to solder without fear of destroying expensive microcontrollers.
• School Science Fairs: A working demonstration of "Automatic Control Systems" using light feedback loops.
• Circuit Theory Education: Perfect for teaching students how a Voltage Comparator (LM393) compares sensor values to drive motors.

Project Evolution

Your Journey with the Mini Cat:

      The Prerequisites:

• None! This is a Tier 1 entry-level kit. All you need is a steady hand and a soldering iron.

      The Upgrade (What's Next?):

• Hack the Brain: Once you understand the analog circuit, advanced users can cut the trace to the motor driver and jumper in an Arduino Nano. This converts the "dumb" analog robot into a programmable one!
• Speed Demon: Swap the standard 2x AA battery holder for a small 7.4V LiPo battery (with a voltage regulator) to significantly boost the speed.
  Estimated Effort:
• Beginner (2-3 Hours): Requires patience with soldering resistors and LEDs.

Virtual Technician: Assembly & Safety

• Sensitivity Tuning: After assembly, if the robot wobbles or loses the line, you must tune the two potentiometers on the top. Place the robot on white paper. Turn the screw until the red LED just turns on, then back it off slightly.
• Motor Polarity: The motors are reversible. If one wheel spins backward, simply swap the Red and Black wires on that specific motor.
• PCB Orientation: Pay strict attention to the Electrolytic Capacitors (C1, C2) and LEDs. They have a positive (+) and negative (-) side. Installing them backward will prevent the circuit from working.

Package includes:

• 1 x  Mini Cat Line Follower Tracking Robot Unassembled Kit DIY

Frequently Asked Questions (FAQ)

• Does this kit require programming or an Arduino?
  No, this uses the LM393 analog comparator chip. No coding is required.
• Is a soldering iron required for this kit?
  Yes, this is an unassembled kit. You must solder components like resistors and sockets to the PCB.
• What batteries do I need?
  You need 2x AA cells (Alkaline or NiMh). They are not included in the package.
• Can I use a 9V battery instead of AA batteries?
  No. A 9V battery is too heavy and provides too much voltage, which may burn out the LEDs or motors.
• The robot spins in circles. How do I fix it?
  This usually means one motor is wired backward. Swap the wires on the motor that is spinning the wrong way.
• Why does the robot ignore the black line?
  The potentiometers are likely untuned. Adjust them until the sensors can distinguish between white and black surfaces.
• Can this robot follow a colored line?
  It works best on a high-contrast black line on a white background (or white line on black). It struggles with low-contrast colors like red or blue.
• Is the chassis plastic or glass?
  It is acrylic plastic. It often looks brown/opaque initially because of a protective paper layer you must peel off.
• What is the "D2-1" model?
  D2-1 is the standard manufacturing code for this specific open-source analog line follower circuit design.
• How long do the batteries last?
  On standard AA alkaline batteries, it will run continuously for about 45-60 minutes.
• Does the kit come with instructions?
  The PCB is printed with all component values (silk screen). We also provide a digital schematic link.
• What happens if I solder the LED backward?
  The LED will not light up, and the circuit might not trigger correctly. Desoldering is required to fix it.
• Can I add a microcontroller to this later?
  Yes, but it requires cutting PCB traces and manual wiring. It is designed as a standalone analog robot.
• What is the width of the line it tracks?
  It tracks a standard 15mm-20mm wide black electrical tape line perfectly.
• Does it work on sunlight?
  Direct sunlight contains strong IR interference which will confuse the sensors. It works best indoors.
• Why are the motors not moving even with new batteries?
  Check your soldering on the battery box terminals and the motor pins. Cold solder joints are the most common cause.
• Is this suitable for a 10-year-old?
  Yes, with adult supervision for the soldering steps.
• Can I control this with a remote?
  No, this is fully autonomous. It follows the line automatically.
• What tools do I need to assemble this?
  Soldering iron, solder wire, wire cutters, and a small Philips screwdriver.
• Is the LM393 chip included?
  Yes, along with an 8-pin DIP socket so you don't overheat the chip while soldering.