onetwoeight

OneTwoEight is a simple BPM counting library. Unlike other BPM counters, it uses a rolling average to calculate BPM, as well as resetting the average when extraneous values are detected.

Install

$ npm install onetwoeight

Usage

The counter can be initiated with no arguments. If arguments are provided, they are a length of rolling average window, and a tollerance range that beats can fall in. If no parameters are used, they will default to a window of 20 and a tolerance of 0.2.

var onetwoeight = require('./onetwoeight');
bpm = new onetwoeight();

Beats are recorded using the tap method.

bpm.tap();

The current bpm can be retreived with the bpm method. It can take an optional boolean as a single paramater to indicate 'precision mode'. If the parameter is true, it will not round the result of the calculation.

bpm.bpm(); //128
bpm.bpm(true); // 128.88650100738751

Counter

A demo counter is provided

node bpm.js

Pressing the space bar will initiate a tap. Pressing t will toggle precision mode. Ctrl + c will exit.

1 : ???
2 : 130
3 : 125
4 : 127
5 : 126
6 : 125
7 : 127
8 : 126
9 : 127
10 : 128