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Proximity - HC-SR04 I2C Backpack

Ping Proximity example that uses an HCSR04 ultrasonic sensor and an I2C backpack (see backpack documentation.

Breadboard for "Proximity - HC-SR04 I2C Backpack"


Fritzing diagram: docs/breadboard/proximity-hcsr04-i2c.fzz


Run this example from the command line with:

node eg/proximity-hcsr04-i2c.js
var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var proximity = new five.Proximity({
    controller: "HCSR04I2CBACKPACK",
    freq: 100,

  proximity.on("data", function() {
    console.log("Proximity: ");
    console.log("  cm  : ",;
    console.log("  in  : ",;

  proximity.on("change", function() {
    console.log("The obstruction has moved.");



Copyright (c) 2012-2014 Rick Waldron Licensed under the MIT license. Copyright (c) 2015-2018 The Johnny-Five Contributors Licensed under the MIT license.