The ESP32 has a deep sleep mode that allows it to use less than 2.5 µA, which is a main reason for me choosing it.
I bought the SparkFun ESP32 thing, and on the product page at https://www.sparkfun.com/products/13907 there's also noted that indeed, "2.5 µA deep sleep current", is supported on this board.
However, in practice the power usage I get is 2mA rather than 2.5 µA. What I did was:
1. Disconnect the power led (which of course consumes power)
2. Created a program for that calls " esp_deep_sleep(5000000); " (deep sleep for 5 seconds). No outputs or anything else is activated (no leds on of course).
3. Supplied power (3.3V) to the GND/UBAT connections, I tried as well to the GND/3.3V directly (to bypass any regulator) but same result.
4. Measured the power when in deep sleep mode, I get to 1.9 to 2 mA, consistently. That's about a thousand times too high
Can you please help me to reach the "real" low power consumption? Thx a lot, I'm really hoping for this feature as it was a key decision point to go for the ESP32 Thing. Thx!