Wemos LOLIN32: Unterschied zwischen den Versionen

@@ Zeile 41: / Zeile 41: @@
   i2c.scan()
-== Open Questions ==
+== Battery Monitoring ==
-* Can you monitor the battery voltage? Schematic says no...
+Unfortunately, no direct method of battery voltage measurement is built into the system.
+But it should be quite easy to implement such a thing: Use a voltage divider on the battery to get a 3.3V max. For a 4.2V cell, this can be achieved using a 27k and 100k resistor.
+  ^  V_bat
+  |
+  R1 = 27k
+  |
+  +----o ADC
+  |
+  R2 = 100k
+  |
+ GND
+Now you can measure the voltage on the battery using the ADC. As the ADC is 12bit, you can get the actual voltage by multiplying the reading by ((27+100)/100) * 3.3 / 2**12
 == Example Projects ==
 * Temperature and Humidity measurement using collectd as datalogger: [https://github.com/reox/esp32_sht21_collectd ESP32_SHT21_collectd]