Henry_Best:
retrolefty:
So one way is to write your sketch and upload it into the Uno board. Then power off the board, remove the 328p chip from it's socket and move it to your standalone PCB or breadboard or wired into a larger project. Then just buy a new $5 328p chip/with bootloader preinstalled into your arduino board. Lather, rinse, and repeat as required. If you progress into burning your own bootloader on to blank chips you can save a couple of dollars per cycle.Lefty
How do you do that if you've got a Uno with an SMD chip?
Well of course you don't. The UNO SMD board was first released when there was a industry shortage/long lead time delay on the DIP 328p chips making the delivery of the standard Uno delayed/backordered. Today there is no good reason to buy a SMD uno over a DIP uno board, and several good reasons to buy the DIP version. Easy repair for damaged AVR chip. Easy development for standalone chips. Are they priced differently? Again a SMD Uno is a poor choice as long as the DIP version is available.
Lefty