An ultrasonic sensor is a device that measures the distance to an object using high-frequency sound waves. By emitting a sound pulse and measuring the time it takes for the echo to return, it calculates the exact distance. It is widely used in robotics, smart automation, and parking sensors

• 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]

 

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.

Features

• Detects objects within a range of 2cm to 30cm
• Easy to set up and use for all skill levels
• Onboard indicator shows when obstacles are detected