Ultrasonic Sensor (HC-SR04) + Raspberry Pi

Hardware

• Raspberry pi 3
• Ultrasonic Sensor - HC-SR04
• A set of resistors for each sensor you are connecting
  • 330Ω and 470Ω
• Jumper wires to connect the sensor(s) to the pi

Wire setup

There are four pins on the sensor that need to be connected to the pi

1. VCC to Pin 2 (5v - power)
2. GND to Pin 6 (ground)
3. TRIG to Pin 12 (GPIO18)
4. The 330Ω resistor to ECHO.

• - On its end, connect it to Pin 18 (GPIO24)

  - Through a 470Ω resistor, connect it also to Pin6 (ground).

  - This is done because GPIO pins only tolerate maximal 3.3V

Connecting resistors and jumper wires between sensors and pi

Software

Python

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Create a new script

• Link to repository with script to detect the distance of an object in front of the sensor

Creating a new script in Python 3

Save your script as ultrasonic_distance.py

• Go to File and click on Save as
• In the field Save in browse for the C: drive and then select a folder to save in
• For the field File name type in ultrasonic_distance.py
• In the field Save as type select All Files
• Click on Save

Use the terminal to run the script

• Click on the monitor icon on the top of the screen
• Type cd "folder name" to change directory to your pythonpractice folder, and hit Enter
• Type ultrasonic_distance.py and hit Enter to run your program