![]() ![]() Url += "&field6=" // I had field 6 still free that's whyĬlient.print(String("GET ") + url + " HTTP/1.1\r\n" + String v=String(volt) // change float into string put your setup code here, to run once: Serial.println("ESP8266 in normal mode") Ĭonst char* host = " " Connect RST en gpio16 (RST and D0 on Wemos) A solution could be to close off the Vbat to the A0 with a transistor, controlled from an ESP8266 pin With the battery monitor this would be 87uA, which is a sizeable increase. The powerconsumption of an ESP8266 in deepsleep is about 77uA. If you do use this possibility, do realise that the resistors drain the battery as well with a constant 10uA (4.2V/420 000ohm). Ofcourse you could also do that in one step, but I like to keep it easy to follow. The True voltage then can be calculated by: So if the Voltage of a fully loaded Cell would be 4.2 Volt, the ADC of the ESP8266 would get 4.2 * 100/420= 1 Voltġ Volt is the max input to the ADC and will give a Raw reading of 1023. This is a 220 k resistor over a 100 k resistor Wemos D1 Internal Voltage dividerīy adding a 100k, it will in fact be a total resistance of 100k+220k+100k=420k. Well the Wemos D1 mini already has an internal voltage divider that connects the A0 pin to the ADC of the ESP8266 chip. Then connect the Vbat through a 100k resistor to A0. This is needed to let the chip awake from sleep. If I just leave the Wemos access the internet continuously it will last 6.5 hours, but for this example I will put the Wemos in Deepsleep for a minute, then read the battery voltage and upload that to Thingspeak.įirst, connect RST with GPIO16 (that is D0 on the Wemos D1 mini). I will illustrate it with a Wemos D1 mini and the Battery shield Wemos D1 Mini Battery shield ![]() There are a million reasons why you would want to monitor the Battery voltage of your Battery fed ESP8266. ![]()
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