Ultrasonic Sensor Raspberry Pi

The hc sr04 ultrasonic sensor we ll be using in this tutorial for the raspberry pi has four pins.

Ultrasonic sensor raspberry pi.

The raspberry pi can also be used as a micro controller but it has a lot more functions because it runs an operating system. Ground gnd echo pulse output echo trigger pulse input trig and 5v supply vcc. We power the module using vcc ground it using gnd and use our raspberry pi to send an input signal to trig which triggers the sensor to send an ultrasonic. The raspberry pi ultrasonic sensor interface is different from interfacing led button lcd motors etc.

Using a raspberry pi distance sensor ultrasonic sensor hc sr04 for many outdoor projects a distance measurement is necessary or advantageous. The list of some of the common sensors that can be connected to the raspberry pi is given below. Including showing how to wire up the sensor to the raspberry pi we also explore writing a python script that will utilize the hc sr04 ultrasonic sensor to calculate distance. These small modules are available starting at 1 2 bucks and can measure the distance up to 4 5 meters by ultrasound and are suprisingly accurate.

We achieve this by measuring the time it takes the ultrasonic pulse being sent out to it being received back by the sensor. The system shall be connected to a screen via an hdmi and it should show something like a radar monitor. Ultrasonic distance sensors are designed to measure distance between the source and target using ultrasonic waves. This is because the output of the hc sr04 ultrasonic sensor is at a 5v logic level whereas the raspberry pi works on a 3 3v logic level.

We use ultrasonic waves because they are relatively accurate across short distances and don t cause disturbances as they are inaudible to human ear. A true micro controller is e g. It can for example also read analog sensors. Via usb or 433 mhz or 2 4 ghz radio.

The raspberry pi can be connected to the number of analog and digital sensors to measure the readings of the various quantities that the particular sensor is designed to provide.