EEZ Bench Box 3

by Envox

Modular, open-source test & measurement chassis

View all updates Mar 15, 2021

New Firmware, a New Website, and More

by Denis Kotlar (a.k.a. prasimix)

Dear all,

As some of you who follow us on Discord have already had the opportunity to find out, the new firmware v1.6 was released three weeks ago. There’s a lot of change in it, and a good part of that comes from your feedback. For those who have not yet switched to the new firmware, and want to do so, I will repeat here: after the first start, you will be greeted by a message about the choice of MCU version. In your case it will be r2B4:

As before, the firmware can be downloaded directly from GitHub, where a list of changes can be also found. Instructions on firmware downloads can be found in Chapter 13 of the User Manual.

New Website

The next big news is that we finally got the chance to redesign our web site! In the process, we decided to move from Joomla to WordPress and move everything to the new domain. We tried to keep the structure of the previous web site and make redirects within the technical possibilities. Redirects should work well in the case of page links, but not images because WordPress stores images differently. In any case, your comments are welcome, as well as reports of unsuccessful redirections of old pages (from the domain).

CE Testing

In the meantime, we also have successfully completed testing for CE marking. It required a series of minor modifications to almost all modules, which we will implement in the new production batch.

New Module Development

Development of the MIO168 module has also continued on which the analog input section (AFE) is now separate allowing us to experiment with different circuits. There are currently plans to make three different AFEs:

  • AFE1 - Two high voltage inputs (up to ±240 V) and two high current inputs (up to ±10 A). Inputs are not insulated from each other
  • AFE2 - Two voltage inputs (up to ±12 V), two current inputs with fast auto-ranging for standby and active consumption measurements (e.g. for battery-powered devices, IoT sensors, etc.). The HI range should go up to ±2 A, where the LOW range should be of ±2 mA
  • AFE3 - Similar to AFE1, except that one voltage and current input is isolated, which will allow more freedom when choosing measuring points.

All AFEs are 4-channel, we chose a 24-bit ADC from the ADS131E family. It will allow simultaneous sampling which is practical for more accurate measurement of power (if two channels are used) and efficiency (when all four channels are used).

About the Author

Denis Kotlar (a.k.a. prasimix)


$154,699 raised

of $85,000 goal

181% Funded! Order Below

Product Choices


BB3 - Starter (Without Peripheral Modules)

A BB3 enclosure kit without bare PCBs but with fully-assembled core modules (AUX-PS, MCU STM32F7, and BP3C DIB 3-slot backplane). The Starter provides an environment for experimenters who are willing to build their own modules or who want a specific BB3 configuration (such as a six-channel BB3).


BB3 - Two Channel (Full)

A BB3 starter kit and two full-featured DCP405 single-channel (40 V, 5 A) peripheral power modules, including an AC/DC power module for each. A two-channel programmable power source with advanced features: remote sensing, remote programming, a down-programmer, and additional OVP (with crowbar).


DCP405 One Channel Module (Full)

A full-featured DCP405 single-channel (40 V, 5 A) peripheral power module with remote sensing, remote programming, a down-programmer and crowbar OVP. Includes an AC/DC module.


DCM220 Two Channel Module

A DCM220 dual-channel (2 x 20 V, 4 A) peripheral power module and its AC/DC module.


Cable Set

Two pairs of high quality, silicone, color marked (black-red), 1 m connecting cables; a pair of clip-on probes; and a pair of insulated crocodile clips.



Envox d.o.o. is home of the Envox Experimental Zone (EEZ), an open source initiative to bridge the gap between DIY / hobbyist / educational / low-budget and professional / commercial test and measurement solutions.

Denis Kotlar (a.k.a. prasimix)

Martin Vladic

Mouser Electronics

Component Provider

TME Electronic Components

Components & Hardware Sourcing

Jedinstvo - Kartonaža d.o.o.


Printing & Packaging

Drives and Motors d.o.o.


PCB & PCBA Manufacturing

See Also

Subscribe to the Crowd Supply newsletter, highlighting the latest creators and projects: