PDU #9 - Why Do I Do It? [Upcycle It Challenge]

RE: PDU #9 - Why Do I Do It? [Upcycle It Challenge]

DAB — Thu, 18 May 2017 18:13:34 GMT

I have never finished a project in which I wish I could do over and make it better.

Unfortunately, when you do one of a kind projects, this is just not possible. Though I did get the opportunity to move a working system to an upgraded device. Even with the upgrade and redesign, our integration worked after we just changed two wires from the initial delivery. Took 30 minutes and the customer was very impressed.

So do not despair. You are experiencing a normal engineering post project depression. You will get over it.

DAB

RE: PDU #9 - Why Do I Do It? [Upcycle It Challenge]

mcb1 — Thu, 18 May 2017 16:35:34 GMT

but in hind sight I might have done it different

Yep been there, done that.

You could have skipped the resistor on the relay control side

You've already provided a pull-up with the LED and resistor, and an open collector works just fine.

It wouldn't have saved a lot.

One thought I've had (now that you've built this one [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-7190cdc4-d3a0-4e5f-847d-e459c96588bc/contentimage_5F00_938.png:16:16])

If you used level conversion to drive the input side (or perhaps a minor modification to the onboard LED or resistor), and wired the LED on the relay board side.

Next week I might see if I can drive one of these type of Relay Boards directly from the Edison.

The 1.8v I/O needs some solutions that we can easily apply, and while the level conversion is one solution, it requires extra bits to be added.

I reduced the resistor value for the 3v3 RPi, so removing the LED might be enough.

Mark

RE: PDU #9 - Why Do I Do It? [Upcycle It Challenge]

Workshopshed — Thu, 18 May 2017 14:11:57 GMT

I was planning on soldering up something very similar in the next few days but with 3 outputs and two inputs. PCBs are good if you know what you will need early on but you need to get those critical path items sorted early in the project. So it's a bit late for me.