{"title":"Ultrasonic Distance Sensor HC-SR04","handle":"ultrasonic-distance-sensor-hc-sr04","url":"/products/ultrasonic-distance-sensor-hc-sr04","description":"The HC-SR04 is a widely used ultrasonic distance sensor that measures distances from 2cm to 500cm (approximately 5 metres) with 1cm resolution. It works by emitting a 40kHz ultrasonic pulse, then measuring the time it takes for the echo to return — making it ideal for obstacle detection, range finding, and proximity sensing.\n\nSend a 10μs trigger pulse and the module emits eight 40kHz ultrasonic bursts, then outputs a pulse proportional to the measured distance. If no object is detected, the output pin goes high for 38ms. A minimum cycle period of 50ms is recommended between measurements for accurate readings.\n\nSpecifications\n\n\nPower Supply: 5V DC\n\nIdle Current: <2mA\n\nMeasurement Range: 2cm – 500cm\n\nResolution: 1cm\n\nEffective Angle: <15°\n\nUltrasonic Frequency: 40kHz\n\nTrigger Pulse: 10μs minimum\n\nRecommended Cycle Period: ≥50ms\n\n\nKey Features\n\n\nNon-Contact Measurement – Ultrasonic ranging without physical contact\n\nSimple Interface – Single trigger pin and echo output; works with any microcontroller\n\nWide Range – Detects objects from 2cm to 5 metres away\n\nLow Power – Under 2mA idle current\n\n\nIdeal For\n\nRobot obstacle avoidance and navigation\nDrone low-altitude sensing\nProximity detection and distance measurement projects\nArduino and Raspberry Pi sensor projects\n","vendor":"Little Bird","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":14558,"title":"Default Title","sku":"LB-LR0230","price":3.95,"compare_at_price":4.54,"on_sale":true,"in_stock":true,"available_quantity":955,"option1":"Default Title"}]}