External Power - What is possible?
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M5Stack power circuit is designed in a way that you can use only a Li-Po battery (other than USB power) as external power source.
For all other solutions you have to modify the PCB.
If you look at the schematic you can see that the external 5V source could be added at several places, but in all cases you have to cut some PCB traces.
The simplest method should be to attach the external 5V to VIN_USB, no trace cutting is needed, but you should not connect USB cable at the same time the external 5V is connected. -
@moelski 在 External Power - What is possible? 中说：
It looks very ugly to use a USB Connector
If you use external power, some kind of connector must be used.
You could use USB cable with right angle connector, like this one, I don't think it looks ugly.
You can remove the USB-A connector on the other side, and attach whatever power source you have.
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Hi,
cutting traces on the PCB is always a bad idea I think ...But connecting a 5V source to the 5V connection on the 2x15 connector should be ok, or not? If there is no battery connected we don need the IP5306?
you should not connect USB cable at the same time the external 5V is connected
That's correct but this is a compromise I can live with.
regards Dominik
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@moelski 在 External Power - What is possible? 中说：
But connecting a 5V source to the 5V connection on the 2x15 connector should be ok, or not? If there is no battery connected we don need the IP5306?
5V connection on the 2x15 connector is the output from IP5306 VOUT pin (5V Boost output pin), so I don't think it is wise to connect external 5V to it.
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@loboris 在 External Power - What is possible? 中说：
5V connection on the 2x15 connector is the output from IP5306 VOUT pin
Well if there is no battery connected and no USB cable attached ... Why should this be a problem?
I would assume that the IP5306 has an internal protection for reverse current. -
You are aware that there are 2 battery connection on the M5?
1 is in the 2x15 connection, one is on the actual main pcb. -
@ajb2k3 在 External Power - What is possible? 中说：
You are aware that there are 2 battery connection on the M5?
1 is in the 2x15 connection, one is on the actual main pcb.Yes I saw that. I think that both directly connected to the VBat connection, correct?!
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@moelski 在 External Power - What is possible? 中说：
I would assume that the IP5306 has an internal protection for reverse current.
It is not specified in the IP5306 datasheet.
You can test it and report the results. -
So, did anyone find a solution. I was about to buy it, but then when I look at the documentation for the power supply voltage I cannot find it! Documentation is quite poor I must add.
I do not need battery operated solution, and the USB power is super ugly and inconvenient!
I need to use external 5V power supply connected to pins inside the board in a professional manner (no pcb hacking). Is this not possible? I cannot believe it!!
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@b1063n said in External Power - What is possible?:
So, did anyone find a solution. I was about to buy it, but then when I look at the documentation for the power supply voltage I cannot find it! Documentation is quite poor I must add.
I do not need battery operated solution, and the USB power is super ugly and inconvenient!
I need to use external 5V power supply connected to pins inside the board in a professional manner (no pcb hacking). Is this not possible? I cannot believe it!!
Yes it is possible as the Stackable modules provide internal power to M5Stack cores. (Sorry been working on my books and documenting units with demos this weekend.)
The documents I have, show that each stackable module has its own voltage regulator that delivers 5 volts to pin 28 of the internal bus (+5V).
If you look at the Proto module you will see that these pins are marked ready for you.
https://docs.m5stack.com/#/en/module/proto
