Features: 1, small size, easy to use; 2, low voltage, low power consumption; 3, wide measuring range; As shown in Figure 4, the measurement accuracy is high; 5, the blind area is small; Applications: 1, the application of waterproof ranging occasions; 2, measuring the spacing between objects; 3, program-controlled car escape; As shown in Figure 4, the robot obstacle avoidance; 5, teaching equipment; 6, security, industrial control Electrical parameters Operating voltage: DC 5V Working current: 15mA Operating frequency :40KHz Distance range: 2cm - 4m Resolution: 1mm Measuring angle :30 degrees Serial baud rate :9600, n, 8,1 Response period: 100ms Operating temperature: -10-60 ? Storage temperature :-20-80 ? Specifications Size :45 * 20 * 15mm Detection angle: The serial ultrasonic range module detects the angular range and gives the best distance sensing at an angle of approximately 30o. Instructions for use: This module will occupy the use of a single-chip IO port, connected to the power supply, the module every 50ms within a range of distance, and from the pin OUT frame, with four 8-bit data. Frame format: 0XFF + H_DATA + L_DATA + SUM 1, 0XFF: for a frame to start the data, used to determine; 2, H_DATA: the upper 8 bits of the distance data; 3, L_DATA: the lower 8 bits of the distance data; 4, SUM: data and, for the effect of its 0XFF + H_DATA + L_DATA = SUM (only low 8) Note: H_DATA and L_DATA synthesize 16-bit data, that is, the distance value in millimeters.