Hi Timm, I've had a tinker today to refresh my memory. Here are a few things: Please go to that first link again. I have closed the PR with a comment because I've realised that ESP-IDF already exposes a way to set phy calibration data (plus it saves the ugly mess of reserving RTC memory internally)....

Have you set CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP? https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/kconfig.html#config-bootloader-skip-validate-in-deep-sleep Also reduce bootloader logging level to none, and tie GPIO 15 low or use esp_deep_sleep_disable_rom_logging...

I think the TPS3839 should be monitoring 3V3, not VBAT.

Also you need to swap VDD/Reset.

It's not always necessary, depending on the nature of the power supply and the required behaviour. There's a section in the ESP32/WROOM datasheet about it. Given that you're experiencing startup issues on battery, and want it to recover reliably and without external intervention, a supervisor is wor...

Couldn't hurt to use bigger caps either side of the HT7833, but most importantly, that little switch is in series with the ESP32 (and is rated for just 50mA @ 12v). This must go. If there's nothing on the 3V3 rail that needs to remain powered when your device is "off", I'd suggest moving the switch ...

That's fine, there's even https://www.freertos.org/xQueueOverwrite.html which is intended for single item queues.

You'll need to dive into "example_connect" since all of your WiFi initialization is apparently hiding in there. See https://github.com/espressif/esp-idf/blob/8bc19ba893e5544d571a753d82b44a84799b94b1/examples/common_components/protocol_examples_common/connect.c#L165-L200 and https://github.com/espres...

HDC2010 Why not supply it with 3.3v as well and save all this trouble? Why do you need the 1.8v rail at all? Is there something I'm missing? Is there not the corollary of the ESP32 being able to recognize a low voltage one ? There is, that's why Sprite is suggesting either a level shifter to bring ...

Hi Brian, I've butchered your great mockups to present what would be, for me, a much more valuable concept (if you can look past the ugliness). It is based on a few assumptions: 1. People initially just want it to work with the least hair torn out as possible. Set up whatever is needed to get them b...