WiPy pin 3V3 not work?
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Hi,
when i attache 3V3 to 3V3 pin (i have checked that 3V3 is on output from UART/USB converter)
as below then board not work
when i restore connection to VIN(5V) like below all work
any hint?
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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.
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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...
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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.
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Ch340 built in ldo can only supply 25ma. Not enough for esp32. 5v comes straight from USB so it is enough.
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@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.
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