Missing GP20

2026-01-30 01:48:58 Ask

Hi this board is supposed to have all 48 GPIO, but GP20 is missing from the pin out as its used by the LED. Is that correct? I think I would need to solder a jumper from the LED to use GP20.

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SpotPearGuestc387a

Answer time:2026-01-30 09:23:50

Yes, the GP20 is already occupied by the LED.

If you need to use it, you can only bring it out using a jumper.

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SpotPearGueste5523

Answer time:2026-01-30 19:18:05

Thanks for confirming. Would be good if an extra pin could be added so GP20 could be accessed. Maybe on the bottom edge and shift 21-25 down and around by one, so that it really did have full 48 GPIO because it's a really board shame it's missing 1 pin!

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SpotPearGueste5523

Answer time:2026-02-01 22:41:15

I realised the PSRAM ChipSelect is on Pin 19, which is also one of the HSTX pins, useful for HDMI output. That means you can only use the PSRAM if u do not use HSTX for HDMI out. That's disappointing, would be better if PSRAM CS should be on GP0, GP8 or GP47 really. Makes it difficult to recommend this board.

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Missing GP20

Raspberry Pi Pico 2 Tiny RP2350B RP2350-Linux Mini Development Board with PSRAM-8MB Or Without PSRAM