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/diy/ - Do It Yourself

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1226641 No.1226641 [Reply] [Original]

What do the red x's inside the circles in this schematic mean? That the pins are not connected to anything?

>> No.1226645

>>1226641
they're connected elsewhere (MOSI/MISO/SCK)

>> No.1226648
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1226648

>>1226645
Ah, that's good news - could someone please show me where those three pins go to? The schematic PDF is under documentation here: https://store.arduino.cc/usa/proto-shield-rev3-uno-size

The documentation says they can be accessed on the "connector pads"...?

>> No.1226663

>>1226648
as far as i can tell it breaks out the MISO/MOSI/SCK pins from the ICSP header on the the arduino board to three holes on the lower right

>> No.1226669
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1226669

>>1226641
Just look where the physical connections go.

>> No.1226683
File: 16 KB, 76x135, Screenshot - 08122017 - 05:14:06 PM.png [View same] [iqdb] [saucenao] [google]
1226683

>>1226669

where is that pic from?

his proto shield shows them here, in pic related.

What that means, OP, is that those three pins on the AVR (the chip inside all arduinos) are connected to these three places on the shield once you plug the shield in. So, if your circuit has SPI functionality, you connect your MOSI/MISO/SCK pins to those pads on the shield which connects them to the AVR so they can communiate via SPI.

>> No.1226701
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1226701

>>1226683
Actually ,for whatever reason my Rev3 protoshield doesn't have those three connection points shown at the page I linked; the other anon's pic is the right one. Pic related is my shield.

>>1226669
Thanks man, Could you please label which of the ICSP pins each of those correspond to? I don't know anything about following traces.