I'm having some issues with deep sleep power comsumption on my ESP 32 NodeMCU board (link below).
I have no specific project to show here, just a general problem that even if the ESP is in deep sleep, after around ~10 days on 2xAA batteries it won't start again.
I have a couple of different multimeters but none of them can messure the current. If I do, the ESP just blinking LED on me (have read the same issue on many others, its something with multimeter drawing volt...)
But back to the issue with high current on deep sleep. I beleve from reading around a bit that it could be the 3.3 voltage regulator. From my understanding of these magic regulators it always draws a litle current ~12mA. If that is the case, then my batteries would run to 50% in ~10 days and voltage is to low.
Could this be the issue, and what could I do about it? Could i just remove it when I only use 2xAA?
Should I insted buy a WROOM and skip all the extra board stuff?
You can do it the way current meters do. Put a low value resistor in series with the load then measure the voltage drop across the resistor. This to say the least will be enlightening.
Really a waste of time to speculate as to what is going on, measure the actual current !
A bare bones ESP32, which does not need a USB-Serial converter on board, will, with a suitable choice of regulator have a deep sleep current of circa 30uA, at least mine do.
gilshultz:
You can do it the way current meters do. Put a low value resistor in series with the load then measure the voltage drop across the resistor. This to say the least will be enlightening.
I don't really get what you are saying here? What do I accomplish by doing this?
freddp:
I don't really get what you are saying here? What do I accomplish by doing this?
You can measure the current flowing with a voltmeter.
If you put a 1ohm resistor in series with the power supply to your device, and you measure a voltage of 5mV across the resistor, how much current is flowing in the resistor?