Vibrator

Revision as of 10:55, 26 July 2008

Vibrator

This is in reference to the vibrator in the Neo Freerunner, however it is likely identical to the Neo 1973, as best I can tell.

Controlling

The vibrator is controlled through:

 /sys/class/leds/neo1973\:vibrator/brightness

When off, it will read 0. Valid ranges appear to be 0-255, with 255 being the fastest.

Python Script For Playing Beats

Reads beats from a file and plays them on the openmoko vibrator.

File format is human readable text, consisting of a simple sequence of integer pairs. The first number in the pair representing the intensity of the vibration from 0 to 255. The second number represents the duration in milliseconds to hold that intensity. Any non digit characters in the file count as a separators between numbers, but are otherwise ignored.

#!/usr/bin/python
"""Vibrator Beat Player

Usage: python beatplay.py [filename]
"""
import sys
import time
import re

def loadFromTextFile(filename):
    infile = open(filename)
    contents = infile.read()
    return re.findall("(\d+)\D*(\d+)", contents)

def playNote(frequency, duration):
    outfile.write(str(frequency) + "\n")
    time.sleep(float(duration) / 1000.0)

def playNotes(notes):
    for frequency, duration in notes:
        #print frequency + ", " + duration
        playNote(frequency, duration)

def playFile(filename):
    global outfile
    notes = loadFromTextFile(filename)
    outfile = open("/sys/class/leds/neo1973:vibrator/brightness", "w", 1)
    playNotes(notes)
    playNote(0, 0)
    outfile.close()

if __name__ == "__main__":
    playFile(sys.argv[1])

Example Beat

The following is an example "song" file that can be used to test the beat player.

125 400
0 200
250 600
0 400

125 400
0 200
250 600
0 400

125 400
0 200
250 600
0 400

125 400
0 200
250 600
0 400