Electronics > Projects, Designs, and Technical Stuff
Power ESP32 with batteries - Voltage Converter
Nikos A.:
Thank you for your answers!!!
First of all I have one question,
--- Quote from: jbb on October 21, 2019, 07:55:33 pm --- It's a common feature nowadays, but you have to be careful because many data sheets show off the quiescent current when the buck is disabled.
--- End quote ---
As Peabody mentioned and looking some datasheets I found the terms "active" and shutdown". What is the difference? Under what conditions the converter is getting shut down?
I believe that I should proceed with a LDO. I measured the board with WiFi enabled and all the sensors connected and the max current consumption was 150mA. I will provide the necessary capacitance for the spikes that may occur during the WiFi connection. Furthermore, I will proceed with the Firebeetle board of DFrobot as I was able to measure 6uA under sleeping mode.
https://wiki.dfrobot.com/FireBeetle_ESP32_IOT_Microcontroller(V3.0)__Supports_Wi-Fi_&_Bluetooth__SKU__DFR0478#target_2
Moreover, you are right about the battery capacity at 3.5V. I will use 3100mAh 18650 battery and according to the website below most of them have been 80% discharged at 3.5V.
https://lygte-info.dk/info/BatteryChargePercent%20UK.html
jbb:
If the regulator is for main power, it’s on all the time.
Beware the marketers who try to sell based on the disabled quiescent current
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