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I have a unidirectional communication from NodeMCU (ESP8266) -> Arduino UNO. The communication works when I power both the devices to my computer. Note that since it is from NodeMCU to Arduino only, I don't use a voltage regulator. However, when I use a battery supply 9V and connect to DC jack or 9V battery, the serial communication doesn't work. I tried even with the voltage regulator.

It is mentioned that I use something between 9V-12V in the spec. Is it not working because 3.3V/5v from NodeMCU is not sufficient? How do I fix this problem?

  1. Currently for the voltage regulator "high", I am supplying 5V from Arduino. Should I provide another supply to pass 9v?

  2. Does it power on if I provide 5V to DC jack or Vin?

  • Please rephrase you question into something understanteble – Dat Ha Oct 21 '16 at 19:07
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9V "transistor" (PP3) batteries are very weak. They barely provide enough current to power the Arduino, let alone a power hungry device like an ESP8266.

You're basically trying to tow a caravan with a skateboard.

| improve this answer | |
  • What should I use? 9V is sufficient to power arduino for a simple blink program – Nikhil Oct 22 '16 at 3:33
  • AA batteries or Lithium ion. – Majenko Oct 22 '16 at 7:15

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