I had similar experience with another dev boards. I found out that the UART chip is involved in that issue. Not sure if that also is the case with TTGO boards. But worth to look into it. Here a quick video of my strange UART power consumption behaviour: https://youtu.be/AiU6VKYXP0k The only solution...

Did you rule out light sleep? I kind of did because i thought that peripherals are OFF during light sleep mode as well. But thanks for asking again. That made me do some reading and I2S might be working during light sleep. Still not really sure about this because - as you already know - I am no exp...

Thanks for your reply. If i understand you correctly. I should give up on the idea recording sound on a ESP32 with a power consumption of less than 5mA? It's possible but it seems a few hundred bucks will not be sufficient to achieve my goal. :| Hmm. Sad to hear. Still. If anybody has a solution or ...

The INMP441 is obsolete and is not produced any more. "Unfortunately" you can still buy the module almost everywhere but this will not be the INMP411. Even they call it INMP411. I had a project where i needed to build 30 recorders and ordered 30pcs INMP411 from different distributors. It turns out t...

I always thought that even 3Mhz should be enough to deal with I2S and sample rates of >44Khz. So you think that the 8Mhz from the ULP is not fast enough the task? This VM3011 microphone looks very interesting for our elephant detector. Thanks for that link. Awesome. For now we need to get the 24/7 r...

Hello, I hope i am in the correct forum for my question. For our elephant-sound-recorders we try to build a recorder which can run 24/7 on a small solar panel. Basically a ESP32 with a digital microphone and a connected SD card. We already built a few working recorders, which work great but the sola...

Andreas Spiess maintains a table with details of many ESP32 boards including power consumption in different modes and the used voltage regulator. Here is a video about "Test of Battery operated ESP32 Boards". A link to the comparison table is in the description. https://www.youtube.com/watch?v=ajt7...

That's what i thought too. But even i cut the LDO off. No change. Hmm.

I have done some investigation and so far this is my status: EDIT: The power consumption problem is not only happening in deep sleep but also in on state of the ESP32! - My ESP32 gets 3,3V directly to the 3,3V pin on the ESP32 - The Power LED has been removed - I have the example deep sleep sketch r...

After desoldering the CP2102N the board consumes around 3mA power. I guess after desoldering the ESP32 on another board it can be used to program the board without the CP2102N. If someone finds a better solution I'm all ears. Many Greetings! Remo Hi, i am dealing with the same (worse) problem. Deep...