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How do I give external power to NodeMCU?
The output from the Voltage regulator is connected to the Vin pin of NodeMCU & 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 NodeMCU using DC Adapter, you can use 3.7V Lithium-Ion or Lithium Polymer Battery.
Can we give 9V to NodeMCU?
With a 9V block battery, you can use the VIN pin of the ESP8266 NodeMCU, that is internal connected with the 3.3V AMS1117 voltage regulator and therefore you need no external components.
How do I power my NodeMCU?
You have 3 possibilities for a power supply of the NodeMCU:
- Operate the NodeMCU on the 3.3V input with 2.5V to 3.6V.
- Operate the NodeMCU on the VIN input pin with a voltage between 7V and 12V.
- Use a USB cable with 5V. A diode prevents current from the 5V input to the USB connection flows.
How much power do I need for a NodeMCU?
Thus supply power from Micro-USB Cable is not enough for NodeMCU Board when we are adding multiple sensors or modules to the Board. This is because Computer USB port can provide less than 500mA of current. Check more about Nodemcu Power requirement here: Nodemcu ESP8266 Datasheets
Why is micro USB not enough for NodeMCU board?
Thus supply power from Micro-USB Cable is not enough for NodeMCU Board when we are adding multiple sensors or modules to the Board. This is because Computer USB port can provide less than 500mA of current.
How is the voltage regulator connected to the NodeMCU?
The output from the Voltage regulator is connected to the Vin pin of NodeMCU & 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 NodeMCU using DC Adapter, you can use 3.7V Lithium-Ion or Lithium Polymer Battery.
Where does the power come from for the ESP8266 NodeMCU?
Power to the ESP8266 NodeMCU is supplied via the on-board MicroB USB connector. Alternatively, if you have a regulated 5V voltage source, the VIN pin can be used to directly supply the ESP8266 and its peripherals.