internal VREF for battery voltage monitoring - edit: Solved

Example sketches for the new Arduino IDE for ESP8266

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Re: internal VREF for battery voltage monitoring - edit: Sol

By mrburnette
- Sun Jul 12, 2015 11:44 am #23069
tytower wrote:Jeeze I just double checked and I have been running all mine with 4.76 Volts . OOps Thanks hey.

Added a couple of diodes and some resistors on the RX and TX lines and all good

Shows 3655 now and that agrees with multimeter
<...>


Just an FYI... using two diodes to drop 4.76 to 3.655 is a Vd of 1.105 total. This Vd is subject to the E=IR rules: therefore 1.105 / 4.76 = 23.2% lost. To cheat the math, one needs to store the energy into an inductor and transform the voltage - cheap DC to DC buck modules are under $1 USD and have a working efficiency of perhaps 92%+. The 8% power lost is far better than the 23.2% lost from the diodes although it does add weight and more expense than the simple diode solution.

Ray
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