Update of our Remotelab equipment

"If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."

If it looks like an advertising blogpost, reads like an advertising blogpost ... it probably is an advertising blogpost! Nobody likes to read advertisements and we don't like to write them at all, but like all proud parents, we would like to show you the new products that our corporate subsidiary, Linux Automation GmbH, has freshly added to their store. With these new products we, and maybe soon you, will complete (y)our Remotelab infrastructure.


Not all projects boot from SD cards, sometimes boards are flashed via USB, boot from an eMMC or even from NAND¹. To switch the active boot mode in this case, you usually just have to short-circuit two pins, or press a button. Since this quickly becomes tiring, especially during constant tests, there is now an elegant technical solution:

The LXA IOBus 4DO-3DI-3AI allows to switch small electrical loads and thus e.g. automatically, where otherwise jumpers would have to be set manually, to switch between different boot modes or to trigger resets, which are otherwise performed by pressing a button. In addition, the 4DO' can be used to read supply voltages or collect digital status feedback and feed it back into the test automation.


In our blog post The LXA IOBus line of lab automation devices we already reported about the ideas to change our lab-internal communication from USB to CAN. A recurring problem with this: a consumer computer cannot do CAN. In our lab servers we usually solve this problem with PCI-Express CAN cards, but for developer laptops these cards are too clunky.

Instead, we like the open source candleLight project very much. So well, in fact, that we decided to brand it with a Rocket Penguin logo and add it as a product to the store.


The RJ45-Matrix is another small, but still very fine toy from the LXA-Tools series. The RJ45-Matrix can be used to make connections between all lines of two RJ45 jacks via solder bridges or any 0402 SMD components.

What have we used the RJ45 matrix for so far?

  • As a breakout board for RJ45 jacks on 2.54mm pin headers.
  • To swap Ethernet pairs between two Ethernet ports.
  • To couple two Ethernet devices via 0402 capacitors AC to feed PoE voltages directly.

What other uses could we think of?

  • To create loopback connections, e.g. to test very long two-wire links over much shorter eight-wire cables.
  • Generating defined cross talk by coupling the different pairs together.
  • Inserting e.g. resistive losses into a line.

¹ What kinds of headaches NAND can create as a boot source would be a great topic for another blog post. Until then, perhaps remember: "Avoid if possible!"

Further Readings

Showcase: Remote Working

Project work with our customers includes the handling of hardware prototypes. Since work is generally done in parallel, on many project for many customers, there is a constant flood of hardware prototypes accumulating on the desks of our developers. These accumulations of loose boards can become a problem. This is especially the case when a number of people work on a prototype. Another common annoyance occurs when a project has not been worked on for a period of time, as this might involve moving the hardware from one desk (or storage location) to another and setting it up again. Right now, in a situation where working from home is more common and relevant than ever, this has become even more of an issue. The distances between desks and storage locations of our developers are now measured in kilometers, rather than meters.

USB-SD-Mux: EMC Testing

Today Jonas and I went to our EMC testing lab to continue the measurements needed to certify electromagnetic compatibility for the USB-SD-Mux.

LXA USB-T1L ❤️ Beagle Play: Exploring Single Wire Ethernet

It seems everybody is talking about Single Pair Ethernet (SPE) these days. So we want to follow the trend and do the same :-) SPE is a class of Ethernet transmission standards that uses just a single pair of twisted pair cable for data transmission. There are multiple SPE variants spanning maximum data rates from a hand full MBit/s to multiple GBit/s and cable lengths from a hand full of meters to kilometers. The most interesting ones from our embedded-centric point of view are 10Base-T1L (point-to-point, up to 1 km), 10Base-T1S (multidrop, approx. 10 m) and 100Base-T1 (point-to-point, 15 m). The new Beagle Play comes with a 10Base-T1L PHY. This makes it a great peer to experiment with our Linux Automation USB-T1L. In this post we will explore the possibilities of 10Base-T1L on a recent Linux system.

Yes we CAN... add new features

Have you ever experienced an otherwise fine product that is missing just the one feature you need for your application?

Pengutronix at Embedded World 2022

Welcome to our booth at the Embedded World 2022 in Nürnberg!

First Steps using the candleLight

So you went and got yourself one of our fancy rocket-penguin branded CandleLight dongles or, being the die hard hacker you are, went and soldered one up in your toaster oven labeled "not food safe". What's next then? How do you use this thing? Let's answer these question by grabbing a Raspberry Pi and exploring some of the possibilities.

labgrid Tutorials

This week, we started our series of YouTube labgrid tutorials. In the next few weeks we will publish more video tutorials showing you labgrid's features and giving you handy tips and tricks.

The LXA IOBus line of lab automation devices

I would like to present to you the LXA IOBus, a CAN-based ecosystem consisting of a protocol, a gateway server and new class of Linux Automation GmbH devices, including the Ethernet-Mux and the 4DO-3DI-3AI input/output board.