HC-SR04

Kaluma library for HC-SR04 which is an ultrasonic distance measurement module.

Wiring

Here is a wiring example with HC-SR04.

Raspberry Pi Pico	HC-SR04
VBUS	VCC
GND	GND
GP16	ECHO
GP17	TRI

HC-SR04 requires 5V input

Install

npm install https://github.com/niklauslee/hc-sr04

Usage

const {HCSR04} = require('hc-sr04');
const hcsr04 = new HCSR04(17, 16);
let dist = hcsr04.distance();
if (dist !== null) {
  console.log(`Distance is ${dist} mm.`);
} else {
  console.log('Failed to measure');
}

API

Class: HCSR04

new HCSR04(trig, echo)

• trig <number> Trigger pin.
• echo <number> Echo pin.

Create an instance of HCSR04 class.

hcsr04.distance()

• Return <number>

Returns the measured distance in millimeter.