Adafruit Feather M0 and US-025 ultrasonic sensor circuitpython example

In this example we connect a US-025 ultrasonic sensor to an Adafruit Feather M0 running Circuitpython

US-025 is an upgraded version of the HC-SR04, with a kind of high performance, low cost ultrasonic module. The module uses the CS100 , a high performance-cost ratio ultrasonic ranging chip.

First lets look at some information about the sensor from the manufacturer

Table of Contents

Description

Electrical parameters	US-025, US-026 Ultrasonic ranging module
Operating Voltage	DC 3V-5.5V
Working current	5.3mA
Operating temperature	-40°C-85°C
output method	GPIO
Induction angle	Less than 15 degrees
Detection distance	2cm-600cm
Detection accuracy	0.1cm+1%

The high-performance, low-cost ultrasonic ranging module introduced by the module; the module adopts the cost-effective ultrasonic ranging chip CS100 the ranging is up to 6 meters, the ranging accuracy is high; the measurement consistency is good, the distance measurement Stable and reliable.

US-025/US-026The ultrasonic ranging module can realize non-contact ranging function of 2cm~6m, working voltage is 3V-5.5V, working current is 5.3mA, support GPIO communication mode, and work stably and reliably.

US-025 has the Same performance as US-026, the same size and the same principle.

the differences between the US-025 and the US-026 are:

US-025 – The PCB is double sided, and the US-026 is single sided
US-025 – The 4 Pin pin header is soldered on the front side (the probe side), the US-026 is a single panel, the front side (the probe side) has no pad, and the pad is soldered on the back side (chip side).

Parts Required

Name	Link
Adafruit Feather M0 Express	Adafruit (PID 3403) Feather M0 Express – Designed for CircuitPython – ATSAMD21 Cortex M0
US-025 ultrasonic sensor	1pcs US-025 US-026 ultrasonic ranging sensor module

Connecting cables	Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire

Schematic/Connection

The Ultrasonic sensor has four terminals – +5V, Trigger, Echo, and GND connected as follows

Connect the +5V pin to +3.3v on your Adafruit Feather board.
Connect Trigger to digital pin 5 on your Adafruit Feather board.
Connect Echo to digital pin 6 on your Adafruit Feather board.
Connect GND with GND on Adafruit Feather.

feather and us-026

Code Example

I used Mu for development, you can use the HCSR04 library

The following is based on a library , I copied the adafruit_hcsr04.mpy to the lib folder on my Feather M0 Express – https://circuitpython.org/libraries

[codesyntax lang=”python”]

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(0.1)

[/codesyntax]

Output

Here is what I saw in Mu REPL window

(5.066,)
(5.185,)
(4.658,)
(3.281,)
(3.349,)
(5.083,)
(3.774,)
(3.332,)

Links