diff --git a/UsbCore.h b/UsbCore.h
index f5eed89b..4a84f56b 100644
--- a/UsbCore.h
+++ b/UsbCore.h
@@ -48,6 +48,8 @@ typedef MAX3421e<P20, P19> MAX3421E; // Balanduino
 typedef MAX3421e<P3, P2> MAX3421E; // The Intel Galileo supports much faster read and write speed at pin 2 and 3
 #elif defined(ESP8266)
 typedef MAX3421e<P15, P5> MAX3421E; // ESP8266 boards
+#elif defined(ARDUINO_XIAO_ESP32S3)
+typedef MAX3421e<P44, P4> MAX3421E; // ESP32 XIAO boards
 #elif defined(ESP32)
 typedef MAX3421e<P5, P17> MAX3421E; // ESP32 boards
 #elif defined(ARDUINO_Seeed_XIAO_nRF52840_Sense)
@@ -56,6 +58,8 @@ typedef MAX3421e<P7, P5> MAX3421E; // Seeed_XIAO_nRF52840_Sense
 typedef MAX3421e<Pb4, Pb3> MAX3421E; // MightyCore
 #elif (defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284P__))
 typedef MAX3421e<Pb4, Pb3> MAX3421E; // Sanguino
+#elif defined(ARDUINO_NRF52840_FEATHER_SENSE)
+typedef MAX3421e<P5, P6> MAX3421E; // ARDUINO_NRF52840_FEATHER_SENSE
 #else
 typedef MAX3421e<P10, P9> MAX3421E; // Official Arduinos (UNO, Duemilanove, Mega, 2560, Leonardo, Due etc.), Intel Edison, Intel Galileo 2 or Teensy 2.0 and 3.x
 #endif
diff --git a/avrpins.h b/avrpins.h
index 42a2f603..9050b72b 100644
--- a/avrpins.h
+++ b/avrpins.h
@@ -1506,7 +1506,7 @@ MAKE_PIN(P19, GPIOC, GPIO_PIN_0); // A5
 #undef MAKE_PIN
 
 
-#elif defined(ARDUINO_NRF52840_FEATHER)
+#elif defined(ARDUINO_NRF52840_FEATHER) || defined(ARDUINO_NRF52840_FEATHER_SENSE)
 
 #define MAKE_PIN(className, pin) \
 class className { \
@@ -1852,6 +1852,47 @@ MAKE_PIN(P13, 13); // MOSI
 MAKE_PIN(P14, 14); // SCK
 MAKE_PIN(P15, 15); // SS
 
+#elif defined(ARDUINO_XIAO_ESP32S3)
+
+// Workaround strict-aliasing warnings
+#ifdef pgm_read_word
+#undef pgm_read_word
+#endif
+#ifdef pgm_read_dword
+#undef pgm_read_dword
+#endif
+#ifdef  pgm_read_float
+#undef pgm_read_float
+#endif
+#ifdef  pgm_read_ptr
+#undef pgm_read_ptr
+#endif
+
+#define pgm_read_word(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned short *)(_addr); \
+})
+#define pgm_read_dword(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned long *)(_addr); \
+})
+#define pgm_read_float(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const float *)(_addr); \
+})
+#define pgm_read_ptr(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(void * const *)(_addr); \
+})
+
+// Pinout for ESP32 dev module
+
+MAKE_PIN(P8, 8); // MISO
+MAKE_PIN(P9, 9); // MOSI
+MAKE_PIN(P7, 7); // SCK
+MAKE_PIN(P44, 44); // SS
+MAKE_PIN(P4, 4); // INT
+
 #elif defined(ESP32)
 
 // Workaround strict-aliasing warnings
diff --git a/usbhost.h b/usbhost.h
index 859f2726..969002d5 100644
--- a/usbhost.h
+++ b/usbhost.h
@@ -118,9 +118,11 @@ typedef SPi< P76, P75, P74, P10 > spi;
 typedef SPi< P16, P18, P17, P10 > spi;
 #elif defined(ESP8266)
 typedef SPi< P14, P13, P12, P15 > spi;
+#elif defined(ARDUINO_XIAO_ESP32S3)
+typedef SPi< P7, P9, P8, P44 > spi;
 #elif defined(ESP32)
 typedef SPi< P18, P23, P19, P5 > spi;
-#elif defined(ARDUINO_NRF52840_FEATHER)
+#elif defined(ARDUINO_NRF52840_FEATHER) || defined(ARDUINO_NRF52840_FEATHER_SENSE)
 typedef SPi< P26, P25, P24, P5 > spi;
 #elif defined(ARDUINO_Seeed_XIAO_nRF52840_Sense)
 typedef SPi< P8, P10, P9, P7 > spi;