diff --git a/porky/src/porky.rs b/porky/src/porky.rs
index e55c16683..c124476fb 100644
--- a/porky/src/porky.rs
+++ b/porky/src/porky.rs
@@ -35,7 +35,9 @@ use heapless::FnvIndexMap;
 use heapless::Vec;
 use hw_definition::config::HardwareConfigMessage::*;
 use hw_definition::config::{HardwareConfig, HardwareConfigMessage, InputPull, LevelChange};
-use hw_definition::description::{HardwareDescription, HardwareDetails, PinDescriptionSet};
+use hw_definition::description::{
+    HardwareDescription, HardwareDetails, PinDescriptionSet, PinNumberingScheme,
+};
 use hw_definition::pin_function::PinFunction;
 use hw_definition::{BCMPinNumber, PinLevel};
 use panic_probe as _;
@@ -341,6 +343,7 @@ async fn tcp_accept(socket: &mut TcpSocket<'_>, ip_address: &Ipv4Address, device
     let hw_desc = HardwareDescription {
         details,
         pins: PinDescriptionSet {
+            pin_numbering: PinNumberingScheme::CounterClockwise,
             pins: Vec::from_slice(&PIN_DESCRIPTIONS).unwrap(),
         },
     };
diff --git a/src/hw/fake_hw.rs b/src/hw/fake_hw.rs
index 481e7c176..912b7a084 100644
--- a/src/hw/fake_hw.rs
+++ b/src/hw/fake_hw.rs
@@ -4,7 +4,9 @@ use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use std::{io, thread};
 
 use crate::hw::{BCMPinNumber, PinFunction, PinLevel};
-use crate::hw_definition::description::{HardwareDetails, PinDescription, PinDescriptionSet};
+use crate::hw_definition::description::{
+    HardwareDetails, PinDescription, PinDescriptionSet, PinNumberingScheme,
+};
 
 use super::Hardware;
 use super::HardwareDescription;
@@ -36,6 +38,7 @@ impl Hardware for HW {
                 model: "Fake Hardware".to_string(),
             },
             pins: PinDescriptionSet {
+                pin_numbering: PinNumberingScheme::Rows,
                 pins: FAKE_PIN_DESCRIPTIONS.to_vec(),
             },
         })
diff --git a/src/hw/mod.rs b/src/hw/mod.rs
index 1a3108e57..8e8300c08 100644
--- a/src/hw/mod.rs
+++ b/src/hw/mod.rs
@@ -96,7 +96,9 @@ pub trait Hardware {
 mod test {
     use crate::hw;
     use crate::hw::Hardware;
-    use crate::hw_definition::description::{PinDescription, PinDescriptionSet};
+    use crate::hw_definition::description::{
+        PinDescription, PinDescriptionSet, PinNumberingScheme,
+    };
     use crate::hw_definition::pin_function::PinFunction;
     use std::borrow::Cow;
 
@@ -209,6 +211,7 @@ mod test {
             pin7.clone(),
         ];
         let pin_set = PinDescriptionSet {
+            pin_numbering: PinNumberingScheme::Rows,
             pins: pins.to_vec(),
         };
         assert_eq!(
diff --git a/src/hw/pi_hw.rs b/src/hw/pi_hw.rs
index 4087de5ce..cfaf67919 100644
--- a/src/hw/pi_hw.rs
+++ b/src/hw/pi_hw.rs
@@ -77,6 +77,7 @@ impl Hardware for HW {
         Ok(HardwareDescription {
             details: Self::get_details()?,
             pins: PinDescriptionSet {
+                pin_numbering: PinNumberingScheme::Rows,
                 pins: GPIO_PIN_DESCRIPTIONS.to_vec(),
             },
         })
diff --git a/src/hw_definition/description.rs b/src/hw_definition/description.rs
index c537116be..a5761c149 100644
--- a/src/hw_definition/description.rs
+++ b/src/hw_definition/description.rs
@@ -57,9 +57,9 @@ pub struct HardwareDetails<'a> {
 #[cfg(feature = "std")]
 /// [PinDescription] describes a pins in the connected hardware.
 /// Array indexed from 0 so, index = board_pin_number -1, as pin numbering start at 1
-#[derive(Serialize)]
-#[cfg_attr(feature = "std", derive(Debug, Clone, Deserialize))]
+#[derive(Serialize, Debug, Clone, Deserialize)]
 pub struct PinDescriptionSet {
+    pub(crate) pin_numbering: PinNumberingScheme,
     pub(crate) pins: Vec<PinDescription>,
 }
 
@@ -67,8 +67,8 @@ pub struct PinDescriptionSet {
 /// [PinDescription] describes a pins in the connected hardware.
 /// Array indexed from 0 so, index = board_pin_number -1, as pin numbering start at 1
 #[derive(Serialize)]
-#[cfg_attr(feature = "std", derive(Debug, Clone, Deserialize))]
 pub struct PinDescriptionSet<'a> {
+    pub(crate) pin_numbering: PinNumberingScheme,
     pub(crate) pins: Vec<PinDescription<'a>, 40>,
 }
 
@@ -95,3 +95,26 @@ pub struct PinDescription<'a> {
     pub name: &'static str,
     pub options: &'a [PinFunction],
 }
+
+/// RaspberryPi and Raspberry Pi Pico use two different pin numbering schemes
+///
+/// RPi uses "Rows":
+///     - top-left is pin 1
+///     - top-right is pin 2
+/// and so on down row-by-row
+///     - bottom-left is pin 39
+///     - bottom-right is pin 40
+///
+/// RPi Pico numbers pins from one (top left) down the left column then up the right column
+/// ending at 40 at the top right
+///     - top-left is pin 1
+///     - bottom-left is pin 20
+///     - bottom-right is pin 21
+///     - top-right is pin 40
+#[derive(Serialize)]
+#[cfg_attr(feature = "std", derive(Debug, Clone, Deserialize))]
+#[allow(dead_code)] // for porky
+pub enum PinNumberingScheme {
+    Rows,
+    CounterClockwise,
+}