Good Morning,

Remeasured ESP32 Pico D4 development kit v4.1, deep sleep current at 4 mA;  current when active 191 mA.  I believe the burden resistance of uA meter accounted for the initial, deep sleep high current reading when attempting to read uV current directly with the meter.  WiFi and Bluetooth were turned off; BME280 was in sleep mode.

Current was calculated from a voltage measurement using a short (~ 4inch) dupont jumper, inserted between 3.3 volt pin and the LDO, voltage regulator; taking a voltage reading in the mV range, across the dupont jumper.

Calculation was done using ohm’s law; knowing the jumper resistance and the voltage across the jumper.

Regards,
William

Hi.
Is that ESP32 board model similar to a Raspberry Pi Pico board?
Does that value seem a little high to you in that scenario?
I haven’t tested deep sleep on a Raspberry Pi Pico yet and I don’t have one of those specific boards to experiment with.
Regards,
SAra

Good Evening Sara,
Yes, the deep sleep current is way too high; still investigating, want to try using 5 Volt pin to an external power supply –without USB and measure again…  Interestingly; when I accidently left USB power connected along with 3.3 Volt LDO power supply, I had the lowest deep sleep current reading.  I do not understand this result or if I damaged the ESP32 Pico D4; however, it still is fully fuctional in my use case.
 

ESP32 Pico D4 Datasheet
 
Regards,
William

Usually, you never get those super low deep sleep current consumptions mentioned in the datasheet.
This is because most of the time, the datasheets refer to the bare chip and not the full-featured board (unfortunately).
 
Interesting discoveries. Thanks for sharing.
 
Regards,
Sara