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Page 170 - Toucpad robotics C11
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    ASSIGNMENTS

                                                                                           21 st   #Coding & Computational Thinking
                  Assignment 1   Smart Campus Assistant Robot                             Century   #Digital Literacy
                                                                                           Skills
                  Theme: Sustainable, smart school operations (delivery + energy saving + simple attendance).
                  A.  Plan & Choose Your Build Path
                      1.  Define scope (write in notebook):
                             Campus delivery of light items (~500 g)
                         °
                             Obstacle avoidance in corridors
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                             Energy saving (auto lights/fans in a demo room)
                         °
                             Basic attendance (choose one: RFID [Arduino-friendly] or QR [Raspberry Pi-friendly])
                         °
                      2.  Pick platform:
                             Arduino UNO   best for motor control + RFID attendance
                         °
                             Raspberry Pi 4/3 + Camera   best for QR/Face attendance with Python
                         °
                      3.  Decide environment:
                             Hardware build (preferred) or Tinkercad Circuits simulation (for logic proof).
                         °
                  B.  Minimum Bill of Materials (choose per platform)
                         Common (both): 2× DC geared motors + caster wheel, chassis, L298N motor driver, HC-SR04 ultrasonic sensor
                         l
                         or 2× IR distance sensors, 1× micro servo (for lid/mini-arm), 1× LDR + 10kΩ resistor (voltage divider), 1× 1-channel
                         relay module (for lamp/fan demo at low voltage), 7–12V battery pack, jumper wires, breadboard.
                         Arduino path: Arduino UNO, MFRC522 RFID kit (if RFID chosen).
                         l
                         Raspberry Pi path: Raspberry Pi (with 5V 3A supply), Pi Camera or USB webcam (if QR chosen), microSD with
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                         Raspberry Pi OS.
                  Safety note: For the “energy saving” demo, use a low-voltage bulb/LED strip through a relay or a safe training mains
                  panel under teacher supervision.
                  C.  Mechanical Setup
                      1.  Assemble the chassis; mount motors and caster.
                      2.  Fix sensor mounts: ultrasonic at front center (or two IR sensors angled ~15° outward).
                      3.  Add a top tray/box (cardboard/acrylic) with a servo-driven lid for payload.
                      4.  Keep wiring length tidy; secure the battery low and centered for stability.
                  D.  Electronics & Wiring (high-level map)
                      1.  Power: Battery   L298N (VIN). L298N 5V out (if available)   logic rails; or use a separate 5V regulator.
                      2.  Motors: Motor A/B   L298N outputs. L298N IN1–IN4   controller GPIOs.
                      3.  Sensors:
                             Ultrasonic: Trig + Echo   controller GPIOs; Vcc 5V; GND shared.
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                             IR pair (alt): OUT pins   GPIOs.
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                      4.  Servo (lid): Signal   PWM pin; Vcc 5V; common ground.
                      5.  LDR  light  sensing: LDR  + 10kΩ resistor  as a  voltage  divider    analog input  (Arduino) or MCP3008  ADC
                                                                             2
                         (for Raspberry Pi) or use a digital light sensor (BH1750) via I C.
                      6.  Relay: IN ‡ GPIO; Vcc 5V; use low-voltage load for demo.

                  168
                  Touchpad Robotics - XI

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