Question

Anindya was busy flexing his biceps while driving in the rain. But every time he had to stop mid-pose to switch on the wiper, his "aesthetic" was ruined. This constant interruption annoyed him badly. Design a smart wiper for Anindya using a rain sensor, servo motor, ESP8266, and a battery.

Smart Wiper System

The Smart Wiper System automates windshield wiping using a two-pin HW-028 rain sensor, an IR obstacle avoidance sensor, an SG90 servo motor, and an ESP8266 (NodeMCU).
It ensures that when it rains, the servo-powered wiper activates, and when an obstacle is detected, the system pauses — keeping the view (and Anindya’s flexing) uninterrupted.

---

Hardware Requirements

• ESP8266 (NodeMCU) → Main controller (handles sensors + servo logic)

• SG90 Servo Motor → Moves the wiper arm

  • Signal → D1 (GPIO5)
  • VCC → 5V
  • GND → Negative rail

• HW-028 Rain Sensor (Two-Pin) → Detects rain via resistance changes, linked to IR sensor

• IR Sensor (e.g., KY-032) → Relays rain/obstacle detection

  • OUT → D3 (GPIO0)

• Battery + 5V Regulator (≥1A) → Powers the circuit

  • ESP8266: ~100–300 mA
  • Servo: ~100–500 mA
  • IR Sensor: ~20–50 mA
  • Rain Sensor: ~10–20 mA

• Breadboard & jumper wires for prototyping