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There are two USARTs (well there's a third, but it doesn't work if using USB).
USART1 (ie, Serial1) can be used on pins B6, B7, or you can use just the receive on A10.
USART2 (ie, Serial2) can be used on pins A2, A3.You got the error because you were trying to set serial2 to use the B6, B7. Or you had TX/RX backwards.
DrAzzy
@JackJamesHoward
@Gordon Can you use any other RX & TX pins on the Pico other than A3 & A2?
I wanted to use pins B6 and B7 but i get an error message saying the pins are not suitable.
As a bit of a slightly related side note, why is USART1 RX listed twice on the Pico pinout?