ESP32 Deep sleep power consumption

epicac
Posts: 2
Joined: Tue Sep 17, 2019 5:10 pm

ESP32 Deep sleep power consumption

Postby epicac » Tue Sep 17, 2019 5:23 pm

Hi guys,

recently I bought a couple of ESP32 Dev boards:
esps.jpg
esps.jpg (144.72 KiB) Viewed 277 times

The upper one has already power indication diod soldered off. But for some reason in deep sleep the power consumption is 9.7mA (resp. 11.2mA with the diod on).
I wanted to use a 3.7V 700mAh LiPo battery but it's drained in 3 days. Battery is connected using VIN, GND pins. The test code is just this:
  1. #define uS_TO_S_FACTOR 1000000
  2. #define TIME_TO_SLEEP  30
  3.  
  4. void setup() {
  5.   esp_sleep_enable_timer_wakeup(TIME_TO_SLEEP * uS_TO_S_FACTOR);
  6.   esp_deep_sleep_start();
  7.  
  8. }
  9.  
  10. void loop() {
  11. }
Do you guys have any idea?
Thanks

ESP_Sprite
Posts: 2832
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32 Deep sleep power consumption

Postby ESP_Sprite » Wed Sep 18, 2019 3:14 am

If any, replace the AMS1117 LDO, they're notoriously inefficient.

epicac
Posts: 2
Joined: Tue Sep 17, 2019 5:10 pm

Re: ESP32 Deep sleep power consumption

Postby epicac » Wed Sep 18, 2019 2:02 pm

Thanks for the answer. I have a couple of HT7333s at home, so I'll try that!

ESP_Sprite
Posts: 2832
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32 Deep sleep power consumption

Postby ESP_Sprite » Thu Sep 19, 2019 3:57 am

You can try, but do note that those LDOs are limited to 250mA. The ESP32 needs a minimum of 500mA on WiFi initialization, otherwise it'll brown out. (If you want to test it anyway: a hacky solution would be to put two HT7333 chips in parallel.)

DavidL
Posts: 3
Joined: Tue Oct 01, 2019 10:14 am

Re: ESP32 Deep sleep power consumption

Postby DavidL » Tue Oct 01, 2019 12:56 pm

Hello
I take advantage of this topic, to know LDO recommendation. for full use. ?

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