diff --git a/frontend/src/simulation/spice/collectPinStates.ts b/frontend/src/simulation/spice/collectPinStates.ts
index e6f55303..bf437c5d 100644
--- a/frontend/src/simulation/spice/collectPinStates.ts
+++ b/frontend/src/simulation/spice/collectPinStates.ts
@@ -45,6 +45,11 @@ export function pinNameToArduinoPin(pinName: string, boardKind: BoardKind): numb
   if (/^PB\d+$/.test(pinName)) {
     return parseInt(pinName.slice(2), 10);
   }
+  // micro:bit-style pad names (P0..P25) used by QEMU-Linux SBC edges and
+  // Gravity ports (e.g. the UNIHIKER's P24). Must come after the PB test.
+  if (/^P\d+$/.test(pinName)) {
+    return parseInt(pinName.slice(1), 10);
+  }
   if (/^\d+$/.test(pinName)) {
     return parseInt(pinName, 10);
   }