caliper: introduce decoder for cheap generic calipers

1 files changed, 36 insertions, 0 deletions

diff --git a/decoders/caliper/__init__.py b/decoders/caliper/__init__.py
new file mode 100644
index 0000000..3fc99fe
--- /dev/null
+++ b/decoders/caliper/__init__.py
@@ -0,0 +1,36 @@
+##
+## This file is part of the libsigrokdecode project.
+##
+## Copyright (C) 2020 Tomas Mudrunka <harvie@github>
+##
+## 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 <http://www.gnu.org/licenses/>.
+##
+
+'''
+This decodes digital output of cheap generic calipers (usualy made in china)
+Decoder will show measured value in milimeters or inches.
+
+Please note that these devices often communicate on low voltage level,
+which might not be possible to capture with 3.3V logic analyzers.
+So additional circuitry might be needed to capture the signal.
+
+This is NOT for calipers using Digimatic protocol (eg. Mitutoyo and similar brands)
+
+More info:
+
+http://www.shumatech.com/support/chinese_scales.htm
+https://www.instructables.com/id/Reading-Digital-Callipers-with-an-Arduino-USB/
+'''
+
+from .pd import Decoder