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I created a project on an Uno as a proof of concept and now have reduced the code and squeezed it onto an ATTiny.

Before I transfer it all to a PCB I want to get it going on a solderless breadboard to make sure everything is still working (I don't quite trust my soldering :P ) and also optimise the layout.

The issue is that an ATTiny has pins at right angles to each other,

enter image description here

so no matter which way it is turned, a row of pins will be along a strip of electrically connected holes on the breadboard.

How do I get around this?

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Don't use that breakout board. Use a DIP ATTiny, which will fit into a breadboard just fine.

Alternatively, use jumper wires to connect that board to your breadboard.

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Use an SOIC to DIP breakout board like this.
There are endless versions available online.

If you want to use you whole dev board on a breadboard use a Type A breakout board like this to power it, and use jumpers to connect to the I/O pins.

enter image description here

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