Description:
HC-SR04P is an ultrasonic ranging module that operates with a wide voltage range.
HC-SR04P ultrasonic distance measurement module can provide 2cm-450cm non-contact distance sensing function.
The module's external dimensions and software are fully compatible with the old version HC-SR04, it can seamlessly switch with the old version HC-SR04.
Operating at a voltage as low as 3V, it can be directly connected to MCU powered by 3.3V.

Parameter:
Mode: HC-SR04P
Probe: 16mm
Frequency: 40KHz
Working voltage: DC 3-5.5V
Detection range: 5V: 2cm-450cm; 3.3V: 2cm-400cm
Detection angle: less than 15°
Operating temperature: -20℃~80℃
HC-SR04 Size: 45*20*15mm
Weight: 8g
Four interface modes:
1: GPIO
2: IIC
3: UART serial port
4: 1-WIRE single bus
Wiring Method: VCC for 5V power supply, GND for ground, TRIG for trigger control signal input, ECHO for echo signal output

Basic working principle:
(1)Using the IO port TRIG trigger ranging, to give at least 10us high level signal to be presented.
(2)The module automatically sends 8 40khz square wave, automatically detects whether the signal return
(3)If there is a signal return, through the IO port ECHO output a high level, the duration of the high level is the ultrasonic time from the launch to return. Test distance = (high level time * speed of sound (340M/S)) / 2

Application:
Toys, Robot Obstacle Avoidance
Liquid, water level measurement
Sitting posture detection
Other ranging applications

Notes:
1. This module should not be connected with electricity, if you want to connect with electricity, then let the module's GND end first connected, otherwise it will affect the normal operation of the module.
2. Distance measurement, the area of the object to be measured is not less than 0.5 square meters and the plane as flat as possible, otherwise it will affect the results of the measurement.