Learn to build an RFID based attendance system using Arduino with step-by-step instructions, circuit diagrams, and complete code. This $35 DIY project replaces expensive commercial systems with ...

The rain sensor sends a LOW signal when water is detected. The buzzer sounds briefly to notify the user. The LCD displays a message: "It is raining" when rain is detected. "No rain" when the sensor is ...

Features Connects to WiFi and maintains connection. Reads fingerprint data and verifies against enrolled fingerprints. Displays fingerprint ID and confidence on a 16x2 LCD. Sends matching fingerprint ...