Model: Arduino Uno R3 (Made in Italy)

Microcontroller: ATmega328P

Ports: USB-B, Power barrel jack

Pins: 14 digital I/O (6 PWM), 6 analog inputs

Price -₹1200

Model : HC-SR04

Operating Voltage: 5V DC

Measuring Range: 2 cm to 400 cm (approx. 4 meters)

Accuracy: ±3 mm

Interface: 4 pins (VCC, Trig, Echo, GND)

Price ₹100. With USB cable

Model :Solenoid electric door lock

Type: Electromagnetic Solenoid Lock

Voltage: Usually 12V DC

Operation: Pull type Price - ₹200

Model: R307 Optical Fingerprint Scanner

Working Voltage: 3.6V to 6V (5V typical for Arduino use)

Interface: UART (TTL serial)Price ₹700

Model :4-channel 5V relay module (model: HW-316)

Type: 4-channel relay module

Operating Voltage: 5V DC

Relay Specs: 10A @ 250VAC / 10A @ 30VDC Price ₹100

Model :NodeMCU ESP8266 development board

Price ₹100