GY-SHT40 Digital Temperature and Humidity Sensor is a high-accuracy, low-power environmental sensor featuring ±0.2°C temperature accuracy, ±1.8% RH humidity accuracy, -40°C to 125°C temperature range, 0–100% RH measurement, and I2C communication. Its compact design makes it ideal for IoT, weather stations, HVAC, greenhouse monitoring, smart home, and Arduino/ESP32 projects.

Capture crystal-clear audio with the ADMP401 MEMS Microphone. Features High SNR (62dB), analog output, and low power. Ideal for voice recognition and IoT.

The DSM501A PM2.5 Dust Sensor Module detects fine airborne particles as small as 1 micron, including smoke, dust, pollen, and mites. It uses a built-in heater for silent thermal airflow and provides a PWM output for easy microcontroller interfacing. Operating at 5V DC, it is ideal for air quality monitors, air purifiers, HVAC systems, Arduino projects, and DIY environmental monitoring.

The HC-SR501 PIR Motion Sensor Module detects human and animal movement using infrared sensing, with an adjustable 3–7m detection range and 5–200s delay. Operating at 4.5V–20V, it provides a digital HIGH/LOW output and low power consumption. Ideal for security systems, automatic lighting, robotics, Arduino, ESP32, and Raspberry Pi projects.