how are you ?
I have a little power problem. I want to power a small cooler using a Pin OUT from NodeMcu. The problem is when I check the PIN without connect the cooler I get 3.3v, but when connect it drops to 2.4v and never start, because needs has minium 2.5v
If I connect to the VIN or 3v PIN's works perfect, but I use deepsleep on my code, so is mandatory power the cooler using a Pin OUT.
There is a solution ? Thanks
Microprocessors are not power supplies, and there are strict rules about how much current is safe to draw from a port pin (different for different microprocessors). It is not much, and nowhere near 0.2 A!
Look up the case for your microprocessor and file the value away for future reference.
Except possibly for a single, low current LED, always use a relay module or transistor switch to control power to other devices.
A NodeMCU can supply no more than 12 mA on its output pins. You have to use a transistor to drive that current.
Thanks guys !
I will read about transistor and which I need to use.
It is actually a (MOS)FET which technically is a transistor, but not the original BJT.
For an ESP device operating at 3.3 V, you need a "logic level" FET such as a IRLR7843
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