Index: digitalmultimeter/tags/0.1/COPYING =================================================================== --- digitalmultimeter/tags/0.1/COPYING (revision 3) +++ digitalmultimeter/tags/0.1/COPYING (revision 3) @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. 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Index: digitalmultimeter/tags/0.1/digitalmultimeter.py =================================================================== --- digitalmultimeter/tags/0.1/digitalmultimeter.py (revision 3) +++ digitalmultimeter/tags/0.1/digitalmultimeter.py (revision 3) @@ -0,0 +1,224 @@ +#!/usr/bin/python +"""This utility reads the serial port data from the +RadioShack Digital Multimeter 22-812 +and translates it into human-readable output. + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . + +Copyright 2006,2008 Eli Carter, retracile@gmail.com +""" + +import sys +import time +import termios + +# The elements of each LCD digit are labeled as A-G and the PERIOD: +# A +# -- +# F | | B +# -- G +# E | | C +# . -- +# P D +# Those map to the bits in a byte: +A = 1 << 0 +B = 1 << 4 +C = 1 << 6 +D = 1 << 7 +E = 1 << 2 +F = 1 << 1 +G = 1 << 5 +# Characters marked as "speculation" are combinations I have not seen used by +# the multimeter, but I have added to avoid "?" output if that combination does +# get used in some case. +byte_digit_mapping = { + 0: " ", + B+C: "1", + A+B+G+E+D: "2", + A+B+G+C+D: "3", + F+G+B+C: "4", + A+F+G+C+D: "5", # Doubles as "S" + A+F+G+E+D+C: "6", + A+B+C: "7", + A+B+C+D+E+F+G: "8", + A+B+C+D+F+G: "9", + A+B+C+D+E+F: "0", # Doubles as "O" + G: "-", + + A+F+E+G+B+C: "A", # speculation + F+G+C+D+E: "b", # speculation + A+F+E+C: "C", + E+G+B+C+D: "d", # speculation + A+F+G+E+D: "E", + A+F+G+E: "F", + A+F+E+D+C: "G", # speculation + F+E+G+C: "h", + F+B+G+E+C: "H", # speculation + C: "i", # speculation + B+C+D: "J", # speculation + F+E+D: "L", + E+G+C: "n", + E+G+C+D: "o", + F+E+A+B+G: "P", + E+G: "r", + F+G+E+D: "t", + E+D+C: "u", # speculation + F+E+D+C+B: "U", # speculation +} + +def byte_to_digit(b): + """Interpret the LCD elements into something meaningful such as digits and + letters. + """ + PERIOD = 1 << 3 + # The period comes before the digit + if b & PERIOD: # decimal? + digit = "." + else: + digit = "" + try: + # Mask out the decimal point indicator + digit += byte_digit_mapping[b & ~PERIOD] + except KeyError: + # TODO: it might be helpful to say which elements were lit... + digit += "?" + return digit + + +class BitMapper: + """Given a byte of output, provide a string of lit LCD elements.""" + def __init__(self, mapping): + self.mapping = mapping + def __call__(self, value): + # Each bit of the given value represents the item in the mapping list; + # return a string + output = [] + for i in range(8): + if value & (1<