How to use i2c-bus - 10 common examples

#!/usr/bin/env node
// From: https://developers.google.com/sheets/api/quickstart/nodejs#step_3_set_up_the_sample
const i2c     = require('i2c-bus');
const fs = require('fs');
const util = require('util');
const readline = require('readline');
const {google} = require('googleapis');

const sheetID = '1BX6R8GhUqUXCKMP2NbJWRahR7Y2RR_ycLzn1Y3z7f7A';
const ms = 15*1000;          // Repeat time

// Read the i2c temp sensors
const bus = 2;
const tmp101 = [0x48, 0x4a];
const sensor = i2c.openSync(bus);

// If modifying these scopes, delete credentials.json.
const SCOPES = ['https://www.googleapis.com/auth/spreadsheets'];
const TOKEN_PATH = 'token.json';

// Load client secrets from a local file.
fs.readFile('credentials.json', (err, content) => {
  if (err) return console.log('Error loading client secret file:', err);
  // Authorize a client with credentials, then call the Google Sheets API.
  authorize(JSON.parse(content), recordTemp);
});

/**
 * Create an OAuth2 client with the given credentials, and then execute the
 * given callback function.
 * @param {Object} credentials The authorization client credentials.

var i2c1 = null

if(process.platform != 'darwin'){
	// doesnt work on mac, so conditional to run on pi

	const i2cBus = require('i2c-bus')

	i2c1 = i2cBus.open(1, function(err){
		if(err){
			console.log("i2c error: "+err )
		} else {
			console.log("I2C OPEN")
		}
	})
}

module.exports = function(){

	var i2c = {}

	i2c.sendByte = function(addr, cmd, byte) {
		if(i2c1){
			i2c1.writeByte(addr, cmd, byte, function(){})
		}

var bus = 1;
var matrix = 0x70;
var time = 1000; // Delay between images in ms

// The first byte is GREEN, the second is RED.
var smile = new Buffer([0x00, 0x3c, 0x00, 0x42, 0x28, 0x89, 0x04, 0x85,
    0x04, 0x85, 0x28, 0x89, 0x00, 0x42, 0x00, 0x3c
]);
var frown = new Buffer([0x3c, 0x00, 0x42, 0x00, 0x85, 0x20, 0x89, 0x00,
    0x89, 0x00, 0x85, 0x20, 0x42, 0x00, 0x3c, 0x00
]);
var neutral =new Buffer( [0x3c, 0x3c, 0x42, 0x42, 0xa9, 0xa9, 0x89, 0x89,
    0x89, 0x89, 0xa9, 0xa9, 0x42, 0x42, 0x3c, 0x3c
]);

var display = i2c.openSync(bus);

display.writeByteSync(matrix, 0x21, 0x01);   // Start oscillator (p10)
display.writeByteSync(matrix, 0x81, 0x01);   // Disp on, blink off (p11)
display.writeByteSync(matrix, 0xe7, 0x01);   // Full brightness (page 15)

setTimeout(doFrown,   0);
setTimeout(doNeutral, 1*time);
setTimeout(doSmile,   2*time);

function doFrown() {
   display.writeI2cBlockSync(matrix, 0x00, frown.length, frown);
}

function doNeutral() {
   display.writeI2cBlockSync(matrix, 0x00, neutral.length, neutral);
}

// options.address is _always_ sent by all I2C component classes in
  // Johnny-Five
  const address = options.address;

  // options.bus is optional
  const bus = typeof(options.bus) !== 'undefined' ? options.bus : this._defaultI2cBus;

  // associate the address to the bus
  if (!this._addressToBus.hasOwnProperty(address)) {
    this._addressToBus[address] = bus;
  }

  // create an i2c-bus object for the I2C bus
  if (!this._i2cBuses.hasOwnProperty(bus)) {
    this._i2cBuses[bus] = i2cBus.openSync(bus);
  }

  return this;
};

#!/usr/bin/env node
// Displays a clock on the LED matrix
// Mark A. Yoder
// 17-Sept-2016

// npm install -g i2c-bus
var i2c = require('i2c-bus');
// var util = require('util');

var bus = 1;
var matrix = 0x70;
var display = i2c.openSync(bus);

// position maps index to a location around the outside of the display
// 0,0 is the bottom left.  Starts at top middle
position = new Array(28);
var i;
for(i=0; i<4; i++) {
    position[i]  = [i+4, 7];
}
for(; i<11; i++) {          // Head down the right side
    position[i] = [7, 11-i];
}
for(; i<18; i++) {          // Left across the bottom
    position[i] = [18-i, 0];
}
for(; i<25; i++) {          // Up the left side
    position[i] = [0, i-18];

* Javascript version.
 *
 * Copyright (c) 2015-2016 Jason Heard
 * Licensed under the MIT license.
 */

"use strict";

var i2cBus = require("i2c-bus");

var Pca9685Driver = require("../").Pca9685Driver;


// PCA9685 options
var options = {
    i2c: i2cBus.openSync(1),
    address: 0x40,
    frequency: 50,
    debug: true
};


// pulse lengths in microseconds (theoretically, 1.5 ms
// is the middle of a typical servo's range)
var pulseLengths = [1300, 1500, 1700];
var steeringChannel = 0;


// variables used in servoLoop
var pwm;
var nextPulse = 0;
var timer;

function init(brightnessValue) {
	var wire = i2c.openSync(1);
	wire.writeByteSync(i2c_address, cmd_set_mode, parseInt(mode_5x11, 2));
	wire.writeByteSync(i2c_address, cmd_set_brightness, Number(brightnessValue));
	return wire;
}

async started() {
        this.i2cBus = i2c.openSync(this.settings.i2cDevice);
        this.measurementInterval = setInterval(this.updateMeasurementsCache, 100);
        this.updateInterval = setInterval(this.updateState, 500);
    },

[getDevice](address) {
    let device = this[devices][address];

    if (device === undefined) {
      device = i2c.openSync(getBoardRevision() === VERSION_1_MODEL_B_REV_1 ? 0 : 1);
      this[devices][address] = device;
    }

    return device;
  }

var i2c = require('i2c-bus')

var i2c1 = i2c.openSync(1);

var i2c_address = 0x60;
var cmd_set_mode = 0x00;
var cmd_set_brightness = 0x19;
var cmd_set_pixels = 0x01;

var mode_5x11 = "00000011";

var max_brightness = 8;
var brightness = 0;
i2c1.writeByteSync(i2c_address, cmd_set_brightness, brightness);


i2c1.writeByteSync(i2c_address, cmd_set_brightness, parseInt(mode_5x11, 2));

var buffer = 2;