How to switch off all the components before deep sleep?

[aneeshp123]

I've gone through all the forums, documentation, and YouTube videos, but I still haven't found a solution to my problem. I'm using an ESP32 development board with an AHT10 sensor module. I am also using a JHD202C LCD display and a DS3231M RTC module. My code, written in Espressif IDE, works flawlessly. However, I’m unsure how to properly turn the module on and off. I plan to run everything on battery power and want to shut down all possible components to conserve energy.

If you have any suggestions or tips on how to implement this in a simple way, I’d really appreciate it.

Thank you!

[Sprite]

What board specifically are you using?

[aneeshp123]

ESP-32 DEVKIT V4

[Sprite]

Okay, and how did you connect the other hardware to it?

(Note that by starting from the DevkitV4, you're already at a bit of a disadvantage... those boards aren't really optimized for battery use as they use a LDO with a fairly high quiescent current.)

[aneeshp123]

I connected the sensors, lcd and rtc by connecting them to gpios with wire and breadboard

[MicroController]

viewtopic.php?t=46060#p149011

[aneeshp123]

Can you tell me how much current will the ldo consume

[MicroController]

The AMS1117-3.3 has a specified quiescent current of 5-11mA.

[aneeshp123]

What if I use a esp32 S3 board instead?
Or else which board would You suggest using for power management

[Jamil.Rohan]

I've gone through all the forums, documentation, and YouTube videos, but I still haven't found a solution to my problem. I'm using an ESP32 development board with an AHT10 sensor module. I am also using a JHD202C LCD display and a DS3231M RTC module. My code, written in Espressif IDE, works flawlessly. However, I’m unsure how to properly turn the module on and off. I plan to run everything on battery power and want to shut down all possible components to conserve energy. In the same way developers optimize for efficiency in fitness apps dev I’m looking for a minimal-power strategy for my setup.

If you have any suggestions or tips on how to implement this in a simple way, I’d really appreciate it.

Thank you!

I’ve worked with a similar setup before, and the biggest power drain in my case turned out to be the AMS1117 itself — its quiescent current is just too high for battery-powered projects. Also, if your peripherals are constantly powered from VCC, they’ll keep drawing current even when the ESP32 is sleeping. I ended up using a P-MOSFET to cut power to the sensor modules and switched to a low-IQ LDO instead of the AMS1117. That brought the idle consumption way down. You might want to look in that direction too.