HY-SRF05 Ultrasonic sensors 5pin

HY - SRF05 ( HYSRF05 ) module is commonly used for obstacle detection and avoidance, also for distance measurement.  Since they use sound waves for detection they are not sensitive to light sources or optically reflective surfaces like IR can be.  In addition, by using sound instead of light, it is possible to measure the time that it takes for the sound to be echo’d back and therefore the distance to the object can be calculated with a fair amount of accuracy which can be quite handy. Specifications: Voltage :DC5V Working current :15mA Working frequency: 40Hz Farthest range : 4.5m The most nearly range : 2cm Measuring Angle : 15 degree The input trigger signal : the TTL pulse of 10us The input echoes signal : output TTL level signal, proportional to the range