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Seeking Your Interest in Roadtesting a Raspberry Pi Add-on Board for developing Ethernet-capable field devices

rscasny

Hi all. It's been awhile since I created a pre-roadtest discussion. It's good to be back. Let me tell you about this product.

As usual. I've been in discussion with a supplier about roadtesting an add-on board for the Raspberry Pi.  Ot's called the EVAL-CN0575-RPIZ. On a nutshell, the CN0575 is a platform for developing Ethernet-capable field devices and applications. More information follows.

I wanted to get your feedback on two questions:

  • What do you need to roadtest it?
  • How interested are you in roadtesting it?

Let me start at the beginning and give you some information about the board:

The EVAL-CN0575-RPIZ is a 10BASE-T1L MAC/PHY interface with Single Pair Power over Ethernet (SPoE) for development of field devices and applications on a Raspberry Pi platform board. The SPoE powered device (PD) and isolated flyback regulator provide 5 V power to the platform board and attached application circuitry. SPoE Class 12 (8.4 W, 24 V nominal) and Class 13 (7.7 W, 55 V nominal) are supported.

Designed for use on the Raspberry Pi platform, the CN0575 hardware features a 40-pin GPIO header, and follows the same mechanical dimensions as a standard HAT.

To allow board stacking and development of field device applications using Raspberry Pi HATs, an additional GPIO header with extended leads is included with each evaluation board. However, the CN0575 can also be used on its own as a basic temperature sensing field device with remote user input/output via an onboard button and LED.

image image image

Here is the documentation:

Datasheet

Circuit Notes

User Guide

For More Information

What do you need to roadtest this product?

I was reading through the circuit evaluation section of the user guide. It says that one needs the following equipment for testing:

  • EVAL-CN0575-RPIZ
  • EVAL-ADIN1100-EBZ
  • 24 V (Class 12) or 55 V (Class 13) power supply
  • Raspberry Pi computer (Model 3B+ or above)
  • Host PC (Windows/Linux/Mac)
  • CN0575 demo Python script
  • Plug-in screw-terminal connector
  • Single-pair of 18 AWG (max) wires
  • Category 5e Ethernet cable with RJ45 connectors
  • USB-A to micro-USB-B cable

Seems like a lot of gear. Do you need all this hardware or can you test it another way? I'm trying to determine what I would need to provide beyond the EVAL-CN0575-RPIZ.

Prospective RoadTest Poll

  • One of my projects-in-waiting is a LoRa gateway. I would like to locate it in my attic to get better range without dealing with all the issues involved in an outdoor installation.. Since there is no power in the attic, PoE would be a useful way to power the system. The LoRa gateway could be based on a Raspberry Pi, which might make this hat a great solution. I would need to explore compatibility with LoRa hats.

    I wouldn't need a PC or a Pi, but would need the hat and single pair / power infrastructure. I can't promise to apply for such a road test, since it depends on what else is in the pipe and the compatibility mentioned above, but it would be tempting.

  • in reply to dougw

    If you're looking for an excellent LoRa hat for that project:  Low-Cost LoRaWAN Gateways! 

    I'm running one of those with good results.

  • in reply to Jan Cumps

    I have noticed your installation enviously ... Relaxed

    Good work on blogging about it.

  • I’ve been reading about SPE, and (hopefully ) products “coming soon”. Coming soon for a year or more, so I am glad to see this question. 

    To respond specifically I think I have most of those items / gear. I was confused what a class 12 24v power supply was but googling helped. Really it’s an SPoE class 12. 

  • It is somewhat different than official RasperryPi PoE hat which can be itself powered over ethernet, means Power + Data on the same wire.

    While here another device that operates along with RaspberryPi will be powered through the Pi. So that means this can used in field like industry or smart home applications.

    But on the other hand the if there is need for fast internet connection using Ethernet one needs to think about it how to provide that?

    Normally industrial sensors do not need connection that has high data rate...

  • SPE is an interesting technology, but one that seems not to have become mainstream enough to be usable just yet. When I roadtested the BeaglePlay, I couldn't do anything with the 10-BaseT-1L connection because there just didn't seem to be anything else to connect it to. Oddly, the beaglePlay also has a non-standard RJ11 connector for SPE.

    I'll have to take a proper look at this when I get the time and I might apply for the road test if I think I can do a reasonable job and potentially connect it to teh BeaglePlay.

  • Those Single Pair Ethernet (Patch) cables are not cheap, and would not be something that I would commonly use like a standard cat5e/cat6 patch cable. For example, the ones from Phoenix Contact are around +$12 for a 1 metre and +$16 for a 2 metre cable

    https://www.phoenixcontact.com/en-ie/products/data-cable-preassembled-spe-t1-ccp-sf20awg22ccp-sf-1183808

  • Based on reading some of the documents above, SPE can use the same single pair, twisted, shileded cable used for RS485. Thumbsup  I've got a partial spool of that.
    To roadtest the board, I think one needs the following:

    • EVAL-CN0575-RPIZ
    • EVAL-ADIN1100-EBZ

    I don't think any of us would turn down a Raspberry Pi, if you threw one in, but I also think that many of us have one that could be pressed into service for the roadtest.

    The last component that might be needed is the SPoE Power Coupler.  I can't figure out if it's really needed or not.  The datasheet (page 6 of 7) shows it in the diagram but does not mention it in the instruction set for connecting the RPIZ to the ADIN1100.  I also can't find the component searching the Internet.

    You may want to inquire of the supplier if the AD-T1LUSB2.0-EBZ will also interface with the RPIZ.  This interface is supposed to come in the AD-SWIOT1L-SL kit (current roadtest Relaxed).  If it can, whomever is roadtesting the AD-SWIOT1L-SL might be able to talk to the RPIZ with it (or vice versa).

  • in reply to BigG

    If I understand correctly, twisted pair can be connected to the screwed green connector - eliminating the need of special cable...

  • in reply to embeddedguy

    This one is the official Raspberry Pi PoE hat. I am using it as a Router for my home. It gets high speed internet from Ethernet and bridges the interface to wlan card, works as Access point and makes it a router device.

    image