We have always listen to customers feedback and made firmware upgrade as needed. For new features and bug fixes, follow this page to upgrade the firmware.

Note1: We provides a command line tool for now, please follow below instructions. Windows, linux, mac are supported, please use corresponding package.

Shannon Tweezers ST42 Firmware Upgrader Instruction Video

Firmware Uploader command line tool

Update on 2023/5 The ota server has changed its domain name, please use latest tool fw-update-2023-5-10.zip in below link.

The command line tool by default downloads the latest firmware from server and push it to device. Please make sure there is internet connectivity before running the tool.

Click to download

Upgrade to specific version

In rare cases, new bugs may bring to latest firmware. Though we’ll fix them as soon as we find them, if your application is affected, you can always upgrade to previous version by add -v v1.5.0 parameter to the command line tool. Replace v1.5.0 with version number you want. Please check below section on details of every version upgrades.

Notice that when no version number specified, it always upgrades to latest version.

Firmware Changes

v1.5.2~1.5.3 2023/5

This series of upgrade added some small improvements on user interface.

  • HOLD function is fixed, which is introduced by OL detection function.
  • Fix the dummy invalid voltage option in menu.

v1.5.1 2023/4/5

Overload detection is now available! When the impedance or DC resistance measured is large than a threshold, the UI now will show OVERLOAD instead of some garbage data.

v1.5.0 2023/4/3

Now you can press and hold joystick in measurement UI to power off the meter. It will beep before turning off and as soon as you release the joystick battery will be disconnected. As for timeout auto-power-off, in which case the meter is not used for a period of time, it will still show original 5 seconds count down UI. Press the joystick to cancel the countdown. If the timeout period is not suitable for you, simply change it in settings menu of system->timeout. Thanks ono on EEVBlog for proposing this optimization! A further optimization for OVERLOAD detection is coming for next revision. Enjoy it!

v1.4.3 2022/7/22

Thanks to TheDefPom’s accuracy review video, we fixed the resistor measurement noise bug in v1.4.2.

Please let us know if you encountered any issue with Shannon Tweezers, we definitely will improve it in short time.

The AUTO mode is also suitable discrete resistor measurement. In fact, AC excitation signal with builtin DFT analysis leads to better noise and accuracy performance since the DC offset in circuit is eliminated compared to DC signal measurement.

The DC resistance measurement is now enabled with builtin both 50Hz and 60Hz notch filter, so the noise introduced via long lead and large resistance can be reduced greatly.

version time changes
v1.5.3 2022/7/24 remove dummy invalid voltage option in menu
v1.5.2 2022/7/24 fix HOLD function introduced by overload detection
v1.5.1 2022/7/24 add overload detection support
v1.5.0 2022/7/24 support press and hold joystick method to power off tweezers
v1.4.4 2022/7/24 fix DCR auto range may fail when shorted.
v1.4.3 2022/7/21 Fix unstable DC resistance result.
v1.4.2 2022/6/27 fix >100mH level inductor measurement stuck issue, note: a short-calibration should be performed to fix this issue
    fix self-calibration may stuck
    added left/right button function to exit/enter menu
    added alarm for unaccepted button
v1.3.9 2022/6/8 added low battery warnings.
v1.3.8 2022/5/25 fix abnormal battery result when switching between LED and DIODE mode.
v1.3.7 2022/5/15 show forward voltage when no diode detected in DIODE mode.
    allow to set auto-off timer to NEVER.
v1.3.6 2022/5/14 fix auto-off timer in DCR and DIODE mode.