A Digitech QM1571 is a cheap multimeter sold in Australia. It can send the contents of it's display each time it's refreshed to a PC via wireless and a USB dongle that looks like a serial port. This program writes a single line to its standard output on each refresh that describes the displays contents. Sample output:
+000.1 mV DC, AUTO
-000.3 mV DC,
-000.4 mV DC, REL
+0.L M ohm, AUTO
While qm1571-multimeter.py was developed and tested with QM1571 (only) the chipset it is based on, the Semico CS7721CN, is used in several other multimeters. The CS7721CN is pin for pin compatible with Fortune Semiconductor FS9721, which is also used in a lot of multimeters. All should work with qm1571-multimeter.py.
There is a README.txt, a very short change log. The protocol used by the QM1571 is described in the the source.
qm1571-multimeter.py is copyright © 2017,2021 Russell Stuart. It is licensed under the GNU Affero General Public License.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
The copyright holders grant you an additional permission under Section 7 of the GNU Affero General Public License, version 3, exempting you from the requirement in Section 6 of the GNU General Public License, version 3, to accompany Corresponding Source with Installation Information for the Program or any work based on the Program. You are still required to comply with all other Section 6 requirements to provide Corresponding Source.
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 Affero General Public License for more details.
Development for qm1571-multimeter.py is hosted on Source forge:
Russell Stuart, 2017-Oct-10.