qibutton

QIButton: read Dallas iButton temperature logger DS1922 with DS9490

About

This tool can be used to read an iButton temperature sensor DS1922L/T/E via the USB 1-Wire adapter DS9490 (chip is a DS2490) on Linux. Two tools are included, a CLI and a GUI based on QT5.

Requirements

• USB communication uses libusb-dev. This only works if the kernel module ds2490 is not loaded (-> rmmod ds2490 or blacklist).
• The user needs r/w access to the USB device. A udev rule should be used to change group to plugdev for Vendor ID 04FA, ProductID 2490
• QT5
• Gnuplot to display the measured values as a plo.

TODO

• Currently no ROM matching is done, so this works only for one 1-Wire device on the bus. In the DS9490B there is only space for one iButton device. The ROM in the DS9490B is another 1-Wire device, but it should ignore the DS1922 specific commmands.
• Support passwords
• Maybe: Write access via CLI