ESP8266 Community Forum

- Sun Jan 01, 2017 3:25 am #60229 Hi, sounds like you are doing a similar project to mine.

https://github.com/steveb1475/WeatherStation

I've been working on it off and on for a while, but I just started putting it up on github.

I'm also using the bme280 and am solar powering the whole thing. I haven't done a whole lot of testing on the charging and capacity, rough calculations look like I should be ok with a single 18650 Lithium-ion. For power management of the battery I'm using one of these:
http://www.banggood.com/USB-Lithium-Bat ... 24048.html

And I'm using a 5v boost converter from the output of the charging module. I'll upload more details to github soon.

- Tue Jan 17, 2017 10:42 pm #61165

...My question is: Is it possible to plug a nodemcu devkit (version 2) to usb port for debugging or coding purposes during it´s powered from a lipo?

I've had no problems connecting mine to usb and battery power at the same time. I've made a bit of progress on mine, I'm now getting data from the BME280 to the ESP and sending it to a database on my LAMP server.
https://github.com/steveb1475/WeatherStation

- Sat Feb 04, 2017 6:27 pm #62047 hey again,

I did not try it till now but I will. Did you maybe a power measurment to have a look at the current during deep sleep? How I said my project is pretty similiar t yours and I saw that my DevKit goes never under 18mA which is very disappointing atm. The reason is maybe the voltage regulator and the chip itself but I cannot put my finger on it. I will try to disable the regulator maybe the current will drop a bit more than. There are also a few other sleep modes (LIGHT_SLEEP, MODEM_SLEEP) and some options for the deepsleep to reduce he power. But my device is not reacting when I program stuff like that but it´s possible that i make some basic mistakes and I´m still working on it. Maybe you should have look at your current too I was very suprised to see that high current. I guess I will switch to another module maybe the ESP-12 or something without the regulator.

Maybe you can share your impressions or oppinions good luck

Sille

- Sun Feb 05, 2017 5:54 am #62068 I'm following this with interest as I am working on a low-power monitor for beehive temperature, humidity and weight. I'm not familiar with the nodemcu devkit. I'm using an ESP-07 (http://www.ebay.co.uk/itm/ESP8266-ESP-0 ... 2002795807)
That draws about 1.2mA in deep sleep. So I would agree that 18mA is disappointing.
My card has a tiny power LED on it, which I might try disconnecting to get the power even lower. Maybe the nodemcu devkit has a more powerful one?
This (rather old) post viewtopic.php?f=13&t=3875 suggests 5mA for a power LED, but I don't know what card it was.