diff --git a/variants/PYBSTICK26_DUINO/variant.h b/variants/PYBSTICK26_DUINO/variant.h
index a8b4238b1f..b270e7a6e1 100644
--- a/variants/PYBSTICK26_DUINO/variant.h
+++ b/variants/PYBSTICK26_DUINO/variant.h
@@ -64,6 +64,29 @@ extern "C" {
 #define NUM_DIGITAL_PINS        32
 #define NUM_ANALOG_INPUTS       8
 
+// PYBSTICK26 Sx pinout
+#define S3  PB9
+#define S5  PB8
+#define S7  PB6
+#define S8  PA2
+#define S10 PA3
+#define S11 PB3
+#define S12 PA0
+#define S13 PB10
+#define S13A  PC3
+#define S15 PB12
+#define S15A  PC5
+#define S16 PB13
+#define S16A  PC6
+#define S18 PB14
+#define S18A  PC7
+#define S19 PA7
+#define S21 PAB4
+#define S22 PA10
+#define S23 PA5
+#define S24 PA15
+#define S26 PA4
+
 // On-board LED pin number
 #define LED_GREEN               PA14
 #define LED_RED                 PA13
diff --git a/variants/PYBSTICK26_LITE/variant.h b/variants/PYBSTICK26_LITE/variant.h
index 91054146f7..ad7b337f4e 100644
--- a/variants/PYBSTICK26_LITE/variant.h
+++ b/variants/PYBSTICK26_LITE/variant.h
@@ -60,6 +60,29 @@ extern "C" {
 #define NUM_DIGITAL_PINS        28
 #define NUM_ANALOG_INPUTS       6
 
+// PYBSTICK26 Sx pinout
+#define S3  PB9
+#define S5  PB8
+#define S7  PB6
+#define S8  PA2
+#define S10 PA3
+#define S11 PB3
+#define S12 PA0
+#define S13 PB10
+// #define S13A  PC3
+#define S15 PB12
+// #define S15A  PC5
+#define S16 PB13
+// #define S16A  PC6
+#define S18 PB14
+// #define S18A  PC7
+#define S19 PA7
+#define S21 PAB4
+#define S22 PA10
+#define S23 PA5
+#define S24 PA15
+#define S26 PA4
+
 // On-board LED pin number
 #define LED_GREEN               PA14
 #define LED_RED                 PA13
diff --git a/variants/PYBSTICK26_PRO/variant.h b/variants/PYBSTICK26_PRO/variant.h
index c3beef0088..3333640361 100644
--- a/variants/PYBSTICK26_PRO/variant.h
+++ b/variants/PYBSTICK26_PRO/variant.h
@@ -77,6 +77,29 @@ extern "C" {
 #define NUM_DIGITAL_PINS        43
 #define NUM_ANALOG_INPUTS       8
 
+// PYBSTICK26 Sx pinout
+#define S3  PB9
+#define S5  PB8
+#define S7  PB7
+#define S8  PA2
+#define S10 PA3
+#define S11 PB3
+#define S12 PA0
+#define S13 PB10
+#define S13A  PC3
+#define S15 PB12
+#define S15A  PC5
+#define S16 PB13
+#define S16A  PC6
+#define S18 PB14
+#define S18A  PC7
+#define S19 PA7
+#define S21 PAB4
+#define S22 PA10
+#define S23 PA5
+#define S24 PA15
+#define S26 PA4
+
 // On-board LED pin number
 #define LED_GREEN               PA14
 #define LED_RED                 PA13
diff --git a/variants/PYBSTICK26_STD/variant.h b/variants/PYBSTICK26_STD/variant.h
index d2efcac957..1aafdbd683 100644
--- a/variants/PYBSTICK26_STD/variant.h
+++ b/variants/PYBSTICK26_STD/variant.h
@@ -71,6 +71,29 @@ extern "C" {
 #define NUM_DIGITAL_PINS        38
 #define NUM_ANALOG_INPUTS       8
 
+// PYBSTICK26 Sx pinout
+#define S3  PB9
+#define S5  PB8
+#define S7  PB6
+#define S8  PA2
+#define S10 PA3
+#define S11 PB3
+#define S12 PA0
+#define S13 PB10
+#define S13A  PC3
+#define S15 PB12
+#define S15A  PC5
+#define S16 PB13
+#define S16A  PC6
+#define S18 PB14
+#define S18A  PC7
+#define S19 PA7
+#define S21 PAB4
+#define S22 PA10
+#define S23 PA5
+#define S24 PA15
+#define S26 PA4
+
 // On-board LED pin number
 #define LED_GREEN               PA14
 #define LED_RED                 PA13