Issue with powering ESP32 Dev Module with 5V regulator(7805) from 12V power supply

Other Hardware General Electronics
41

Hi,

If one end of the wire reads 4.99V constant and the other reads 4.57 , 4.56V, then your wire has problems because your wire should have damn close to 0R resistance and so near as possible 0 difference in potential.

Can you post an image(s) of your basic setup now please with just the components in your diagram shown?

Thanks.. Tom.. :smiley: :+1: :coffee: :australia:

42

Hi,
Can you measure V1 and V2 voltages for me please.

That is measure the voltage between the ends of each connecting wire to see if you have a volt drop along them.

image (2)edit
image (2)edit985×676 199 KB

Thanks.. Tom... :smiley: :+1: :coffee: :australia:

43

image
image1000×750 54.8 KB

image
image1000×750 66 KB

V1 = 0.04V
V2 = 0.06V

44

Hi,
So if V1 and V2 are 40mV and 60mV volt drops = 100mV, how can the difference in potential between the wires at the ESP32 be;
4.99V - 4.56V = 0.43V or 430mV ????

Where are you measuring the 4.56V, at what terminations?

Thanks for the pictures too. :+1:

Tom... :smiley: :+1: :coffee: :australia:

45

I have marked in the picture where I measured from.

The purple point is where I originally measured 4.56V from.

There is change in the voltage at the esp32 it is now 4.7V

project (4)

46

Please confirm the 5V coming in on the USB cable (from the PC) is not connected to 5V coming from your external 12v to 5v converter.

1 Like
47

I am not powering it from the usb cable, it has just been left in the board not connected to the pc

48

At some point you start wondering about flaky breadboards and/or jumpers.

49

Hi,

I agree, pull everything out of the protoboards, turn them through 180degrees and fit your components back onto the board.
That is, place your components in a totally different part of each board.

Also check the solder joints of all your PCB modules.

Tom.... :smiley: :+1: :coffee: :australia:

50

I have done a direct connection right to the board, and that has seemed to have worked. Just having problems with the amplifier but that should be a easier fix.

Thank you for all the help guys.

51

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