How do I power up my ESP32?
The output from the Voltage regulator is connected to the Vin pin of ESP32 & GND is connected to GND. Hence you can power up the module using 9V/12V DC Adapter or by 9V Battery. On the other hand, if you don’t want to power up the ESP32 using DC Adapter, you can use 3.7V Lithium-Ion or Lithium Polymer Battery.
How do I turn on ESP32 without USB?
Re: How to power up ESP32-DevKitC without USB port? You only need to supply 5V. Make sure the power source (batteries) can handle a 500mA spike without the voltage dropping too much. Limits are set by the (iirc) AMS1117-3.3 LDO, which the datasheet indicates to be 4.6V to 17V.
What kind of battery do I need for my ESP32?
When the ESP32 starts up, it pulls so much current out of the AA alkaline batteries that the voltage drops entirely to zero, resetting/crashing the ESP32. In summary, I can not power the ESP32 NodeMCU with 2 AA batteries. The lithium iron phosphate battery (LiFePO4 battery) has a nominal voltage of 3.2V and a maximum voltage of 3.65V.
Is the voltage too high for the ESP32?
However, the voltage of 3.7 to 4.2V is much too high for the ESP32, depending on the state of charge, and must therefore be reduced. This has the disadvantage that a large part of the energy is permanently used to reduce the voltage to 3.3V.
Which is the vout pin for the ESP32?
The Vout pin of the voltage regulator should output 3.3V. That is the pin that will power the ESP32 or ESP8266. Finally, after making sure that you’re getting the right voltage on the Vout pin of the voltage regulator, you can power the ESP32. Connect the Vout pin to the 3.3V pin of the ESP32 and GND to GND.
Which is the best battery for ESP8266 NodeMCU?
In summary a LiFePO4 battery is very suitable for the ESP8266 and I recommend to power the NodeMCU as well as the WeMos D1 with a LiFePO4 on the 3.3V pin. The maximum voltage of LiPo and Li-ion batteries are around 4.2V and too high to connect directly to the 3.3V pin.