Comments on: ESP8266: Wifi data logger already running for more than 2 months on batteries! https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html Tue, 13 Dec 2016 20:17:30 +0000 hourly 1 https://wordpress.org/?v=6.5.8 By: Simon Jowett https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html#comment-126 Sat, 11 Jul 2015 08:50:35 +0000 http://blog.squix.org/2015/06/30/esp8266-wifi-data-logger-already/#comment-126 Thanks very much for the blog post – I've got everything up and working a great source for these low power sensor projects thanks! A trip up point was me not attaching GPIO 16 to the rest pin. It would be useful for new users to put a note at the top of the code for all connections required.

I have a question about Field 3 in the code which is named as voltage….

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String temp = String(dht.readTemperature());
String humidity = String(dht.readHumidity());
String voltage = String(system_get_free_heap_size());
String url = "/update?key=";
url += thingspeak_key;
url += "&field1=";
url += temp;
url += "&field2=";
url += humidity;
url += "&field3=";
url += voltage;

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Is this the voltage on the ESP8266 chip? I thought that expression was related to the free memory on the ESP83266…. is this a check to see if the heap is changing over time (for debug)?

Anyway thanks again for the great work with this SoC!

]]> By: squix78 https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html#comment-109 Thu, 02 Jul 2015 03:59:49 +0000 http://blog.squix.org/2015/06/30/esp8266-wifi-data-logger-already/#comment-109 In reply to Anonymous.

I updated the post above. For completness and repetition's sake: https://github.com/squix78/esp8266-projects/tree/master/arduino-ide/thingspeak-data-logger

]]> By: Anonymous https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html#comment-107 Wed, 01 Jul 2015 18:55:31 +0000 http://blog.squix.org/2015/06/30/esp8266-wifi-data-logger-already/#comment-107 Hi. Thanks a lot. Looks very good.
Can you provide the code to see how you did it?
Thanks!

]]> By: Anonymous https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html#comment-105 Wed, 01 Jul 2015 09:05:55 +0000 http://blog.squix.org/2015/06/30/esp8266-wifi-data-logger-already/#comment-105 Again a very interesting post. Looking at the datasheet, the dropout voltage for the reg. is below 100mV. Looking at discharge curves in general(for AA alkaline), I would say that it is roughly ½ way. /LCL

]]> By: Anonymous https://blog.squix.org/2015/06/esp8266-wifi-data-logger-already.html#comment-104 Wed, 01 Jul 2015 02:24:16 +0000 http://blog.squix.org/2015/06/30/esp8266-wifi-data-logger-already/#comment-104 Hi – can you provide and details on the code you used on this deep sleep project?

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