I went with the ADAfruit feather system for the 2.0 version to get the SD and RTC as part of a modular system. Although the ESP is a bit more than the street price for nodeMCU, in the big picture its really still cheap for what it is compared to something like an Arduino. Even the SainSmart duinos (which are fine) are still relatively expensive. [quote=“flywire, post:37, topic:2989”]
$16.40 for international shipping
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My biggest disappointment with AdaFruit. They charge me around $13 and I live less than 200 miles from them. I have complained with no response.
Yeah, the SD is just an SPI device. The Adalogger is really just a connector. Just make sure the Clk, Miso, Mosi, and CS (gpio15) are connected along with 3.3v and GND. Be careful because the pinout of the microSD is different from the full size.
The library supports both the DS3231 and the DS1307, so it would be trivial to adapt to them. Accuracy isn’t an issue. The AC synchronization is handled by the ESP millisecond clock. The RTC, while an important part of any datalogger, needs only to be within a few seconds, and IotaWatt checks the NTP server every hour and adjusts.
There are no power issues that I am aware of with the nodeMCU 0.9 or 1.0. My house runs on a 1.0 and has been running uninterrupted for the past two weeks. The ADC boards could easily be modified to accept the nodeMCU, or an adapter board could be made pretty inexpensively (maybe with an RTC and SDsocket).[quote=“flywire, post:37, topic:2989”]
One application is a pump shed. Can the NodeMCU ESP8266 devkit still be used with the shields getting it to reset periodically to work with the power issues?
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Once again, there are no powr issues, but the IotaWatt reboots in about 15 seconds, fills in the log gaps, and keeps right on going pretty much uneventfully.[quote=“flywire, post:37, topic:2989”]
The main thing that I like about the first two options is that they are not tied to a single supplier.
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I like that too. That’s why it’s open. Hopefully this will catch on when I finish the software and there will be a few hardware options.