HC-SR04 Ultrasonic Distance Sensor Module
Candle Safety
1. Trim your wick before burning your candle the first time and every subsequent burn thereafter.
2. We advise burning your candle for periods of no longer than three hours at a time.
3. Discontinue burning your candle when there is 10mm / 1cm of wax is remaining.
4. Always burn your candle on a stable and heat resistant surface, away from drafts or items that can catch alight.
5. Never leave a burning candle unattended, near children or pets.
6. If you’re burning more than one candle at a time, space your candles approximately 100mm (10cm) apart.
Product Description Ultrasonic Distance Sensor provides very short (2CM) to long-range (4M) detection and ranging. The sensor provides precise and stable non-contact distance measurements from about 2cm to 4 meters with very high accuracy. It can be easily interfaced to any microcontroller. This ultrasonic sensor module can be used for measuring distance, object sensor, motion sensors etc. High sensitive module can be used with microcontroller to integrate with motion circuits to make robotic projects and other distance, position & motion sensitive products. The module sends eight 40Khz square wave pulses and automatically detects whether it receives the returning signal. If there is a signal returning, a high level pulse is sent on the echo pin. The length of this pulse is the time it took the signal from first triggering to the return echo. Wiring 5V(positive) Trig(control) Echo(receive) GND(negative) Features Measures the distance within a wide range of 2cm to 400cm Stable performance Accurate distance measurement High-density Small blind distance