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Update 'firmware/sensors.ino'

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This commit is contained in:
klaute 2019-01-28 10:54:16 +00:00
parent a11f8aef4f
commit f0974e6e79
1 changed files with 5 additions and 1 deletions
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firmware/sensors.ino
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@ -53,6 +53,10 @@ float fetchWindspeed() {
// Copied from https://arduinodiy.wordpress.com/2016/12/25/monitoring-lipo-battery-voltage-with-wemos-d1-minibattery-shield-and-thingspeak/
#ifdef BATTERY_POWERED
float getBatteryVoltage() {
// ESP8266 ADC pin input voltage range ist 0V .. 1V
// The Wemos D1 mini does already contain a voltage divider circuit: A0(Wemos PCB) -- [220kOhm] -- ADC (ESP8266)-- [100kOhm] -- GND
// The (+) pole of the battery is connected to the A0 pin of the Wemos board through a additional 100kOhm resistance.
// The battery voltage of 4.2V max is measured as 1.0V on ESP8266 ADC pin.
uint16_t raw = analogRead(A0);
float volt = raw / 1023.0;
return volt * 4.2;