HC-SR505 PIR Hareket Sensör Modülü

Geared stepper motor with ULN2003 driver board for precise low-speed rotation in Arduino motion projects. The Stepper Motor is an electromagnetic device that converts digital pulses into discrete mechanical rotations. Unlike standard DC motors that rotate continuously when voltage is applied, a stepper motor moves in precise, fixed angular increments known as steps. This open-loop positioning capability makes it ideal for applications requiring exact displacement and speed control, such as CNC machinery, 3D printers, and robotics, where it can also maintain a holding torque to lock a load in position. The ULN2003 Driver Board functions as a high-current Darlington transistor array that bridges the gap between low-power control logic and the motor. Microcontrollers cannot output the high current necessary to energize the motor's internal coils and connecting them directly would damage the control circuitry. The ULN2003 receives the low-current sequencing signals from the microcontroller and switches a separate, higher-current external power supply to drive the motor windings in the correct order.

The MQ-2 Gas Sensor Module is a metal-oxide semiconductor device that detects concentrations of LPG, propane, hydrogen, smoke, (gas leaks) and methane in the air. It utilizes an internal heater and a tin dioxide ($SnO_2$) sensing element, whose electrical conductivity increases in the presence of combustible gases to provide an accurate representation of gas density. An integrated potentiometer allows user adjustment of the digital threshold limit, making it ideal for gas leakage alarms, industrial safety monitors, and environmental tracking projects.

QTR-1A analog reflectance sensor for line tracking and surface contrast detection. The QTR-1A is a miniature reflectance sensor that detects surface reflectivity by measuring infrared (IR) light. It carries a single infrared LED and a phototransistor pair; the LED emits IR light, and the phototransistor measures how much of that light bounces back from the target surface. This immediate, low-latency analog readout makes it a standard component for edge detection, proximity sensing, and line-following robots where distinguishing between contrasting surfaces (like black and white) is necessary

The **37-in-1 Arduino Sensor Kit** is a comprehensive collection of pre-assembled electronic modules designed for rapid prototyping and learning with microcontrollers. It consolidates a diverse array of hardware inputs and outputs—such as temperature, motion, light, magnetic, and acoustic sensors—into a single package with standardized pin configurations. By incorporating all necessary biasing resistors and capacitors directly onto each module's PCB, the kit eliminates complex circuit design and allows components to interface immediately with an Arduino via standard jumper wires.

SW420 vibration and tilt sensor module for shock detection and anti-tamper applications. The SW420 is a motion-sensing module used in security alarms, smart appliances, and impact detection systems. It contains a small rolling roller or spring inside a metallic housing that breaks an electrical circuit when shaken or tilted. When the sensor is still, the circuit is closed and outputs a LOW signal. When it detects vibration or tilt, the internal contacts momentarily separate, causing the module to output a HIGH signal. It operates on 3.3V to 5V, features an onboard potentiometer to adjust the vibration sensitivity, and connects directly to any microcontroller digital pin to trigger immediate alerts.

MQ-3 alcohol sensor module for measuring alcohol vapor concentration in air. The MQ-3 is a gas sensor module used in breathalyzers and environmental monitors to detect ethanol alcohol vapor in the air.It contains a tin dioxide ($SnO_2$) heating element whose electrical resistance drops when it comes into contact with alcohol gas. The module converts this change in resistance into both a 0V to 5V analog voltage signal—which tells you the relative concentration of the alcohol—and a digital high/low signal for simple threshold triggers. It operates on 5V and requires a built-in heater to warm up before it can provide accurate readings to a microcontroller.