Hibernate on Arduino Nano ESP32

Hardware Nano Family Nano ESP32
1

I have a battery powered application I run on my Arduino Nano ESP32, I measured teh deep sleep power consumption to be ~14mA. This gives me a bit too little standby time, is there a way to use the ESP32 hibernation mode?

I'd like to use this code to switch of power domains before going into sleep:
esp_deep_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_OFF);
esp_deep_sleep_pd_config(ESP_PD_DOMAIN_RTC_SLOW_MEM, ESP_PD_OPTION_OFF);
esp_deep_sleep_pd_config(ESP_PD_DOMAIN_RTC_FAST_MEM, ESP_PD_OPTION_OFF);
esp_deep_sleep_pd_config(ESP_PD_DOMAIN_XTAL, ESP_PD_OPTION_OFF);
esp_deep_sleep_pd_config(ESP_PD_DOMAIN_ULP, ESP_PD_OPTION_OFF);
esp_deep_sleep_start();

The error it gives is:
Compilation error: 'esp_deep_sleep_pd_config' was not declared in this scope

2

I have found this Github issue that may be related to your question, where someone suggested to use esp_sleep_pd_config (without deep_!) instead. Hope this is helpful!

3

This worked! I figured out the power consumption is from a perifirial appliance (VL53L0X Time-of_Flight sensor) running in the background. The problem is that I cannot "cut" the 3V3 power out from the board during deep sleep.

Both libraries I can use (Adafruit and Pololu) for this sensor do not have the option to shut down the VL53L0X on board microcontroller. Is there a way to "de-initialize" such a sensor, so that it does not consume powers?

1 Like
4

Hi. I have seen a small transistor used to switch off power to the VL53 when an ESP8266 is in deep sleep, and their doesn't seem to be any particular reason this couldn't be used with ESP32. See this link... [https://www.instructables.com/WiFi-Oil-Tank-Monitor/]
(https://www.instructables.com/WiFi-Oil-Tank-Monitor/)

I'm going to try this myself, good luck with your efforts.