I bought this Arduino starter kit from Amazon. The problem I have now is that the voltage supplied by the breadboard adapter seems to change every time I turn it off and on. And not by small amounts either. The voltage swings between 6.5 and 4.8V. Am I doing anything wrong or is that power supply just bad? The changing voltage messes up all my Sensor readings which is bad. So is there a better power supply or any way to fix this one?

Wiring diagram: enter image description here

  • If you can supply the sensor from the Arduino's +5 pin, the input voltage (coming from the power supply) shouldn't matter. But to help more, we'll need to know how you wired your experiment. – JRobert Dec 6 at 14:21
  • added my wiring – ACB Dec 6 at 14:57
  • how many mA can the power source supply? – Juraj Dec 6 at 15:18
  • 700mA according to the documentation – ACB Dec 6 at 15:20
  • try to supply the NodeMcu from USB (computer or charger) and wire the breadboard power rails to NodeMcu Ground and 5 V pins – Juraj Dec 6 at 15:32

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