WiPy pin 3V3 not work?
-
Hi @livius,
If I get it correctly, you want to power the WiPy with the converter?
Are you sure you are connecting to a Vin pin and not a Vout? -
And are you sure that the converter can produce enough current? Many cannot... If you have another power supply which delivers exactly 3.3 V and can deliver the necessary current, you could retry that.
-
Yes i want to power WiPy from converter.
It work if i connect 5V from converter to 5V VIN WiPy input Pin
but not if i connect 3V3 from converter to 3V3 WiPy input Pin--And are you sure that the converter can produce enough current
What current? WiPy2 consume 850uA if documentation is true here. -
The 850 uA figure is just in suspended mode for WiFi and with the processor sleeping I believe. The ESP32 data sheet says that it can actually draw up to 225 mA when transmitting WiFi. With the LED etc. I would add some more. So your converter must be able to supply that. At least if the WiFi is enabled. And I guess some headroom would be helpful as well, I guess those are just average figures, short peaks could probably be higher. At least that is the case with the ESP8266...
-
It seems you have to move the jumper to pin 2-3, instead of pin 1-2.
Use a voltmeter to check the voltage on pin 3.
-
Ch340 built in ldo can only supply 25ma. Not enough for esp32. 5v comes straight from USB so it is enough.
-
@Frida
the jumper is ok - i have checked the voltage on the converter@littlebat
maybe thats it, i read on seller 250mA but have not check specification by myself
i must test it with distinct power 3V3 not from converter -
BTW: From the documentation (not sure if it was there before):
"When powering via 3V3: The input voltage must be exactly 3V3, ripple free and from a supply capable of sourcing at least 500mA of current" -
maybe thats it
i still not have replacement 3V3 with power e.g. 1A - when i got it i will back -
a) WiPy consumes a substantial peak current when sending. That may be for a few ms only each time, but that makes it even harder for a power supply, because the impedance has to be low and the regulation speed fast.
b) I prefer to take the 3.3V pin as an output and would always supply it through the Vin pin. Then the internal power regulator ensures a proper supply.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login