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Recap  In a previous blog:  https://www.element14.com/community/people
eilk/blog/2019/02/17/esp8266-power-consumption-further-studies  I observed that the power consumed by the Wemos d1 mini during deep sleep was pretty negligible - about 22.7 mAh over a period of 100 hours, including the Serila-USB interface and the resistor chain used to connect the battery to the A/D converter. I concluded, therefore, that the majority of the power consumed was during the actual sketch execut ...
neilk

Send an Email from ESP8266

Posted by neilk Feb 22, 2019
Background  In previous blogs, I have described my investigations into using an 18650 3.7V 2400mAh battery to power a Wemos d1 mini ESP8266, via a Wemos battery shield, which plugs directly into the d1 mini, just like an Arduino shield.   While waiting for my latest long-term power consumption tests to complete, I wondered if it might be possible to send an Email from an ESP8266, to alert me that the battery voltage is reaching a critical level, or perhaps, just to confirm that the b ...
Introduction  In a postscript to my last Blog:   https://www.element14.com/community/people
eilk/blog/2019/02/14/investigating-the-power-consumption-of-a-wemos-d1-mini-esp8266   I concluded that the power consumption of the Wemos ESP8266 during Deep Sleep was negligible - around 227 microAmps. This includes the current drawn by the USB-Serial interface and extra current drawn by the battery monitoring resistor chain.   This represents 22.7 mAh over 100 hours and is pret ...
Background  In my previous Blog: https://www.element14.com/community/people
eilk/blog/2019/02/14/investigating-the-power-consumption-of-a-wemos-d1-mini-esp8266   I described my investigations into the power consumption of a Wemos d1 mini ESP8266 device, powered by an 18650 2400mAh Li-ion battery, via a Wemos battery shield which has the same form factor as the d1 mini. The Wemos was reading from two DS18B20 temperature probes and also reading the battery voltage at 1 minute interval ...
Background  I'm working on a long term project (several years now, if I'm honest!), to provide environmental monitoring and possibly some environmental control for my greenhouses. I've already investigated temperature monitoring using DS18B20 probes, which I've found very reliable and easy to use, provided you don't need a very long cable run!   I was inspired to pick the up project again by this blog: https://www.element14.com/community/community/project14/mixing-electronics-water/ ...