Open Energy Monitor

What are you developing?
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RogerClark
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Re: Open Energy Monitor

Post by RogerClark » Wed Mar 01, 2017 11:53 pm

rexnanet wrote:In this case the external ADC is cheaper ;) around 0€ ;) lol
Thats why I considered it.
Dont think these are the ones I saw the first time but they vive an idea:
https://hackaday.io/project/13327-teens ... pter-board

https://hackaday.io/project/4446-e-ink- ... pi-display
Yep, ePaper is up and coming, but not widely available yet.

And fairly costly. That adaptor was $25 and the display is another $15 or more

PavloPub
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Re: Open Energy Monitor

Post by PavloPub » Sun Nov 12, 2017 2:14 am

rexnanet wrote:
Wed Mar 01, 2017 10:45 am
I'm going to try the ESP8266+MCP3008+emoncms.org approach first because it's simpler.
Hi! Have you had a chance to progress with your idea?

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rexnanet
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Re: Open Energy Monitor

Post by rexnanet » Wed Dec 13, 2017 3:15 pm

PavloPub wrote:
Sun Nov 12, 2017 2:14 am
rexnanet wrote:
Wed Mar 01, 2017 10:45 am
I'm going to try the ESP8266+MCP3008+emoncms.org approach first because it's simpler.
Hi! Have you had a chance to progress with your idea?
Hi PavloPub,

I've actually went for an ESP8266+STM32F103 (blue pill) because of the already available code. But I found a problem, the UART pins on the ESP are connected to the serial-USB adapter, so I have to desolder some resistors for it to work. It's assembled but not tested yet... :)

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RogerClark
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Re: Open Energy Monitor

Post by RogerClark » Wed Dec 13, 2017 7:12 pm

Use software Serial on the ESP8266 on some other pins

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rexnanet
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Re: Open Energy Monitor

Post by rexnanet » Thu Dec 14, 2017 9:57 am

Didn't remember that :)
I was focused on using HW because of another project and didn't even remember I could use that on this one... Thanks :)

How fast can it go (reliably)?

Edit:
answering myself: 38400

https://forum.arduino.cc/index.php?topic=431522.0
Probably other libraries could do more but the "stock" one seems to be ok up to 38400.

I'll give it a try.

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RogerClark
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Re: Open Energy Monitor

Post by RogerClark » Thu Dec 14, 2017 8:07 pm

38400 sounds plenty fast enough.

I think I sample for 100 half cycles, i.e 1 second, which is time to send over 3000 chars to the ESP8266

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