Schematic Design for Line Follower Robot

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Professional electronic schematic diagram, KiCad / EasyEDA style, clean white background, dark red component symbols, green wires, crisp vector lines, high resolution 4K, professional engineering documentation appearance.

Circuit title: Two-channel symmetric line follower robot

Power supply:
- BT1 = 8V battery
- Positive terminal of BT1 connected to global VCC rail
- Negative terminal of BT1 connected to global GND rail
- VCC and GND rails distributed clearly to both mirrored channels

Top channel (Motor 1, upper half of schematic):
- U1 = CNY70 reflective IR sensor
- U1 pin 3 connected to VCC
- U1 pin 4 connected to VCC
- U1 pin 2 connected to VCC
- U1 pin 1 connected to resistor R2 = 560 ohm to GND
- The node between U1 pin 1 and R2 is the top signal node
- That top signal node also connects to resistor R3 = 20k ohm to GND
- The top signal node goes through resistor R5 = 1k ohm to the base of Q2
- Q2 = 2N2222A NPN transistor
- Q2 emitter connected to GND
- Q2 collector connected to VCC through resistor R6 = 1k ohm
- Q2 collector also connects through resistor R7 = 1k ohm to the anode of U5
- U5 = red LED
- Cathode of U5 connected to GND
- Q2 collector also connects directly to the base of Q1
- Q1 = 2N2222A NPN transistor
- Q1 collector connected to GND
- Q1 emitter connected to VCC
- DCF1 = N20 DC motor, 500 RPM
- DCF1 pin 1 connected to VCC
- DCF1 pin 2 connected to Q1 collector

Bottom channel (Motor 2, lower half of schematic):
- U3 = CNY70 reflective IR sensor
- U3 pin 3 connected to VCC
- U3 pin 4 connected to VCC
- U3 pin 2 connected to VCC
- U3 pin 1 connected to resistor R10 = 560 ohm to GND
- The node between U3 pin 1 and R10 is the bottom signal node
- That bottom signal node also connects to resistor R9 = 20k ohm to GND
- The bottom signal node goes through resistor R8 = 1k ohm to the base of Q3
- Q3 = 2N2222A NPN transistor
- Q3 emitter connected to GND
- Q3 collector connected to VCC through resistor R4 = 1k ohm
- Q3 collector also connects through resistor R1 = 1k ohm to the anode of U2
- U2 = red LED
- Cathode of U2 connected to GND
- Q3 collector also connects directly to the base of Q4
- Q4 = 2N2222A NPN transistor
- Q4 collector connected to GND
- Q4 emitter connected to VCC
- DCF2 = N20 DC motor, 500 RPM
- DCF2 pin 2 connected to VCC
- DCF2 pin 1 connected to Q4 collector

Component list shown on the schematic:
- Q1, Q2, Q3, Q4 = 2N2222A NPN transistor
- U1, U3 = CNY70 IR sensor
- U2, U5 = red LED
- R2, R10 = 560 ohm
- R3, R9 = 20k ohm
- R1, R4, R5, R6, R7, R8 = 1k ohm
- DCF1, DCF2 = N20 motor 500 RPM
- BT1 = 8V battery

Style requirements:
- Symmetric vertical layout, top and bottom channels mirrored around the central battery supply
- All reference designators and component values clearly visible
- Standard schematic symbols only, no breadboard style
- White background
- Dark red component outlines and symbols
- Green wires
- Sharp, precise engineering drawing
- Clean spacing, aligned parts, filled connection dots on nodes
- High detail, technical, publication-quality schematic
Nota importante
Tu prompt describe conexiones eléctricamente poco usuales en Q1 y Q4 porque dice:
  • emisor a VCC
  • colector a GND
  • y el motor al colector
Eso no corresponde a una etapa NPN típica de manejo de motor. Si quieres, puedo darte una segunda versión corregida eléctricamente para que el esquema sea:
  • visualmente igual,
  • simétrico,
  • y además funcional para fabricar.
Versión corregida funcional
Agregar protección motor
Revisar transistores motor
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    Symmetric Line Follower Robot thumbnail
    Two-channel symmetric line follower robot, dual CNY70 sensor front-end with mirrored 2N2222A motor drive stages and central 8V battery input

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