The HC-SR501 PIR Motion Sensor Module is a highly reliable, low-power infrared sensor designed for automatic motion detection. Operating between DC 4.5V and 20V, it features adjustable sensitivity and time delay settings, making it perfect for Arduino projects, smart home automation, and DIY security systems.

The FC-28 Soil Moisture Sensor Module is an essential, easy-to-use tool for measuring the volumetric water content in soil. Fully compatible with Arduino, Raspberry Pi, and ESP32 microcontrollers, it is the perfect solution for automated gardening, smart agriculture, and DIY automatic irrigation systems.

Key Highlights:

• Dual Outputs: Analog (AO) for precise percentage readings and Digital (DO) for quick high/low threshold alerts.

• Adjustable Sensitivity: Built-in potentiometer to set your custom soil moisture trigger points.

• Visual Diagnostics: Features on-board power and switch status LEDs for quick debugging.

• Operating Voltage: \(3.3\text{V} \text{ to } 5\text{V DC}\)
• Spectrum Range: \(760\text{ nm} \text{ to } 1100\text{ nm}\) (Infrared)
• Detection Angle: \(\sim 60^{\circ }\)
• Detection Range: \(\sim 20\text{ cm} \text{ to } 100\text{ cm}\) (depends on flame size)

• Output Types: Digital (High/Low) and Analog
• Comparator Chip: LM393
• Operating Temperature: \(-25^{\circ}\text{C} \text{ to } +85^{\circ}\text{C}\) [1, 2, 3, 4, 5]