How to connect esp8266 board with 6v extra power through 5v pin

Projects General Guidance
41

Yes that LED

42

so i was reviewing the previous solutions and due to the limited space I have, i would prefer this one

should I still connect it through 5v and gnd pin and do I need any other voltage regulator?

43

5V needs 5V.
Will not work with 3.3V

The two boards are different, finding a solution that will work with both will be more complicated than using a solution for each.
See post #35

44

That specific Esp32 has very low dropout regulator on board, so you can connect 3.7V battery directly to 5V pin.
But this is not the case with your Esp8266 board.

45

oh does that means the esp8266 needs a extra dropout regulator

46

It means that first you need to tell why you want to power it through 5V pin instead of 3.3V pin.

47

You never want to operate a voltage regulator in "dropout" because it is NOT regulating.

The input to the regulator on the waveshare board need to be at least 4.23V. It explained in the datasheet.

48

for esp32 s3 i will connect the battery through 5v pin as you guys suggested; for esp8266 I will connect it through 3.3v pin

i think this way it is right

I didn't pay enough attention on what I typed, sorry

49

thanks for the explanation, I did misunderstood again :smiling_face_with_tear:

50

You can't connect 3.7V battery through 3.3V pin, you need to use Lifepo4 3.2V battery to do that.

51

does that means the actual input voltage shouldn't be higher than what the pin voltage is?

52

You should never connect a voltage to an Output pin, otherwise you risk damaging your board
I won't tell you to do something that may damage your board.

53

It needs to be within operating voltage range of esp8266, below 3.6V in any case.

Lifepo4 cell voltage is 2.5V-3.6V from empty to full. Esp8266 operating voltage range is identic to that. That offers very efficient powering option without energy wasting conversions.

54

@arthsu5158

Since in this discussion two participants (@kmin and @jim-p ) say opposite things - you will have to figure it out yourself.

In fact, this is always the more correct way - instead of a dozen stupid questions, just sit down and think, read the documentation.

55

And when done with that, you need to start thinking of battery protection. How to protect the battery from over discharge. Some batteries have protection built in, others don't and you need to take care of it.

If you want to go with easy route, get a board that have complete battery management built in. You just connect battery to BAT pins and you are good to go. Like this for example:

56

Excellent advice!
I don't know people always try to do things that obviously contradicts what the documentation recommends or buy things without knowing what they are buying

57

agree!
do you mean by checking the datasheet?

58

for example I've got a datasheet, how do I read it and am I finding the right thing?

59

or I should looking for this thing

60

should looking for this thing
Yes