SNMP Temperature Monitoring System – Hardware Update

As written about earlier (Do It Yourself: SNMP Temperature Monitoring System) we use the SNMP monitoring nodes in several use cases here at Norwegian Creations.

However the blog post does only a minimal hardware setup with a temporary connection method between the temperature sensors and the Orange Pi.

Previous cable connection method

A PCB daughter card is born

To improve the hardware connection we decided to make a small daughter card for the Orange Pi Zero used. It should improve the usability, add some simple isolated digital inputs (for potential future use), a status led and some ESD protection.

As this new specification also adds features we can now for example connect a door sensor switch or a 230V wall adapter for sensing AC power to the digital inputs.

Thus we can in addition to more robust 1-WIRE hardware interface, do more cool stuff with the boards.

From the proposed specification we made a schematic and PCB.

As you can see in the schematic above we added both ESD protection, a status led and some simple isolated digital inputs.

Assembly

For initial testing we assembled 4 PCB’s.

It works!

Daughter card in operation (grey cable are the 1-W sensor cable)

 

The new daughter card makes the installation a lot better and nicer looking.

After a lot of demands on the original SNMP-blogpost, we can ship out some of the cards we have left. So don’t hesitate to drop us a note in the comment or through the contact us page if you are interested.

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