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Thanks for reaching out!
I don't have access to a TinyTILE, so, I can't tell you for sure where R15 is. Nevertheless, I can tell the quick test you can do to find where this resistance is found.
As you can see in TinyTILE's schematics (https://www.element14.com/community/docs/DOC-84346/l/eagle-design-filezip) pin 1 of J3 is directly connected to R15. So, you can measure continuity between pin 1 of J3 and the resistances around J3 in order to find R15. Once you find a resistance that has continuity with pin 1 of J3, measure it in order to verify that you indeed found the correct resistance. Since the resistance you are looking for is of 0Ω, you will basically measure a short circuit.
Checking pictures of the board I can see that there is a line that points to the R15 label, I believe this line shows the location of R15. You can check the component that I think is R15, nevertheless, try the test I mentioned above to make sure. These pictures show what I mean:
Anyhow, if you still have doubts about this after trying the test, I suggest you to post your question in https://www.element14.com/community/docs/DOC-82913.
I hope this information helps you,
In the tiny tile documentation:
tinyTILE has a DC V-IN connection, which accepts unregulated DC input, from approximately
3.8V to 15V. This allows the board to be powered without USB from an external power source.
If you look at the pictures the VIN is left of the USB Connector and GND is right below it.
my mistake - VIN is right of the USB adapter
Thanks but the issue is that you have to configure the board for one or the other Vin source. Otherwise, if you hook up a USB cable to a PC for communication rather than power, you'll have two separate competing power sources that now coupled. That's the purpose of the R15 resistor and R17 depop resistor pads. You're approach would work fine if you never planned to connect USB and battery at the same time.
Thanks Pedro, I'll probe those spots and hope I get it right. The Fab1 board is a little clearer than the Fab4 board spin about this, so the picture helps.