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Few weeks late, sorry. Anyone doing this on a newer part should look at the C3, deep sleep is about 5uA and the same board rules apply. Devkit numbers are meaningless, as above.

About 90ms awake total. Wifi and mqtt was like 2 seconds. Massive difference!!

Good numbers. Told you to come back with them! What do you see for wake time with ESP-NOW?

Kept going after /progrider/t/0ve0JwhGsLJ0 - bare C3 module now, 6uA asleep, I measured properly this time! - 18650, 1W panel, CN3791 charge board - wakes every 10 min, sends over ESP-NOW to a base station. Way less airtime than wifi+mqtt -…

30cm is fine at 100kHz. If it gets flaky drop the pull-ups to 2k2 before you change the cable.

Box is a Pi Zero in a plastic junction box, on the shelf above the door. - BME280 on i2c, address 0x76, cable is 30cm which is about the limit before it gets flaky - writes to local sqlite, porch box pulls over ssh every hour - condensation…

Nice. Post the numbers after a month on the battery, I'd like to see how close it gets to the sum.

GOT IT. 14uA with the 1M divider and DHT on a GPIO!!! kris you are a legend. Marking this solved. Burden voltage was also real, it kept resetting until I shorted the meter during wake.

Also how are you measuring? A multimeter on the uA range has a big burden voltage. Can brown out at wake-up when it pulls 200mA through that range. If it reboots in a loop on the meter and not on the bench supply, that's why.

There you go. A 20k divider on a 4V cell is 200uA all by itself. Go to 1M + 1M and put 100nF across the bottom resistor so the ADC has something to sample. And power the DHT from a GPIO, or a P-channel switch, so it's off during sleep.

DHT22 and a divider, 10k + 10k for battery voltage. Oh no.

What else is on the rail? Sensor? Voltage divider for the battery?

Parts came!! Bare module + MCP1700. Now reading 210uA. Better but not 10!!

For what it's worth I gave up and used a bare WROOM-32 on a small carrier with an MCP1700. It's fine for a garage sensor.

That'll get you maybe 2mA back. CP2102 and the regulator are the rest. If you want the real number you need a bare module and a low Iq regulator.

The LED! ok I can desolder the LED

You're measuring the board, not the chip. Those devkits have a USB-serial bridge, a linear regulator with a fat quiescent current, and a power LED. All of it stays on.

Datasheet says about 10uA in deep sleep. I measure EIGHT MILLIAMPS. Battery lasted 9 days instead of the year I was bragging about!! esp_sleep_enable_timer_wakeup(600ULL * 1000000ULL); esp_deep_sleep_start(); It definitely sleeps, the wifi …