adafruit-circuitpython-hcsr04 0.4.25

Introduction

The HC-SR04 is an inexpensive solution for measuring distances using microcontrollers. This library provides a simple driver for controlling these sensors from CircuitPython.

Dependencies

This driver depends on:

• Adafruit CircuitPython

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-hcsr04

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-hcsr04

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-hcsr04

Usage Example

You’ll need to dedicate two pins to communicating with the HC-SR04. The sensor communicates in a very rudimentary manner, so it doesn’t matter which pins you choose, as long as they’re digital IO pins (pins that start with “D” are digital).

There are two ways of instantiating a HCSR04 object: with or without using a context manager.

See Also:

Adafruit’s guide on Lifetime and ContextManagers

Gives more info on using context managers with CircuitPython drivers.

board

A list of pins available on your device. To view this list, first get a REPL (the guide linked was written for the pyboard, but it still works), then input the following:

import board
dir(board)

import time
import board
import adafruit_hcsr04

sonar = adafruit_hcsr04.HCSR04(trigger_pin=board.D5, echo_pin=board.D6)

while True:
    try:
        print((sonar.distance,))
    except RuntimeError:
        print("Retrying!")
    time.sleep(2)

import board
from adafruit_hcsr04 import HCSR04
with HCSR04(trigger_pin=board.D5, echo_pin=board.D6) as sonar:
    try:
        while True:
            print(sonar.distance)
            sleep(2)
    except KeyboardInterrupt:
        pass

Documentation

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.