diff --git a/src/component/ComponentCard.tsx b/src/component/ComponentCard.tsx
index 6d430d5..8355abe 100644
--- a/src/component/ComponentCard.tsx
+++ b/src/component/ComponentCard.tsx
@@ -190,7 +190,18 @@ export default function ComponentCard(props: Props) {
         cableID = "Cable: " + (component.settings.addressType - 8);
       }
       return port + " " + cableID;
-    } else {
+    } else if (component.settings.addressType === quack.AddressType.ADDRESS_TYPE_I2C) {
+      let description = ""
+      let type = getFriendlyAddressTypeName(component.settings.addressType);
+      description = type
+      if(component.settings.expansionLine){
+        description = description + ": Exp Line " + component.settings.expansionLine
+      }
+      if(component.settings.muxLine){
+        description = description + " ,Mux Line " + component.settings.muxLine
+      }
+      return description
+    }else{
       return getFriendlyAddressTypeName(component.settings.addressType);
     }
   };
diff --git a/src/device/autoDetect/DeviceScannedComponents.tsx b/src/device/autoDetect/DeviceScannedComponents.tsx
index 2be89a9..95c3759 100644
--- a/src/device/autoDetect/DeviceScannedComponents.tsx
+++ b/src/device/autoDetect/DeviceScannedComponents.tsx
@@ -12,6 +12,7 @@ import ResponsiveDialog from "common/ResponsiveDialog";
 import { useComponentAPI, useDeviceAPI, useSnackbar } from "hooks";
 import { ConfigurablePin } from "pbHelpers/AddressTypes";
 import ScannedOneWirePort from "./OneWire/ScannedOneWirePort";
+import I2CExpander from "./I2CExpander";
 
 interface Props {
   scannedComponents: pond.ComponentAddressMap
@@ -27,6 +28,7 @@ interface CompStep {
 }
 
 let i2cBlacklistAddresses: number[] = [0x70]
+let i2cExpanderAddresses: number[] = [0x71]
 
 export default function DeviceScannedComponents(props: Props){
   const {scannedComponents, device, availablePositions, availableOffsets, refreshCallback} = props
@@ -35,6 +37,7 @@ export default function DeviceScannedComponents(props: Props){
   const [scannedI2C, setScannedI2C] = useState<pond.DetectI2C>() //the unmodified scan of addresses
   const [scannedOneWire, setScannedOneWire] = useState<pond.DetectOneWire[]>([])
   const [validI2CCompAddresses, setValidI2CComponentAddresses] = useState<quack.AddressData[]>([]) //the filtered array of address data
+  const [expanderAddresses, setExpanderAddresses] = useState<quack.AddressData[]>([])
   const [components, setComponents] = useState<Component[]>([])
   const [steps, setSteps] = useState<CompStep[]>([]);
   const { error, success } = useSnackbar();
@@ -69,17 +72,23 @@ export default function DeviceScannedComponents(props: Props){
 
   useEffect(()=>{
     let valid: quack.AddressData[] = []
+    let expanders: quack.AddressData[] = []
     //filter the address data
     let addr = scannedI2C?.settings?.foundAddresses
+    console.log(addr)
     if(addr){
       addr.forEach(addrData => {
         if(!i2cBlacklistAddresses.includes(addrData.address)){
-          if(!(addrData.address === 0x71 && addrData.expansionLine === undefined)){
-            valid.push(addrData)
-          }
+            if(i2cExpanderAddresses.includes(addrData.address) && addrData.expansionLine === 0){
+              expanders.push(addrData)
+            }else{
+              valid.push(addrData)
+            }
         }
       })
     }
+    console.log(valid)
+    setExpanderAddresses(expanders)
     setValidI2CComponentAddresses(valid)
   },[scannedI2C])
 
@@ -256,33 +265,49 @@ export default function DeviceScannedComponents(props: Props){
         {scannedI2C !== undefined && 
           <Box marginBottom={5}>
           <Box justifyContent="space-between" display="flex">
-            <Typography sx={{fontWeight: 650}}>
-              I2C Sensors
+            <Typography sx={{fontWeight: 650, fontSize: 20}}>
+              I2C Scan
             </Typography>
             <Button variant="contained" color="primary" onClick={()=>{removeScan(scannedI2C.key, pond.ObjectType.OBJECT_TYPE_DETECT_I2C)}}>Clear Scan</Button>
           </Box>
-          {validI2CCompAddresses.length > 0 ? validI2CCompAddresses.map((addr, index) => {
-            return (
-              <ScannedI2C key={index} sensorNum={index+1} addressData={addr} deviceProduct={device.settings.product} componentSelectionCallback={componentSelection} availablePositions={availablePositions.get(quack.AddressType.ADDRESS_TYPE_I2C) ?? new Map<quack.ComponentType, number[]>()}/>
-            )
-          }) :
-            <Box sx={{
-              margin: 1,
-              display: "flex",
-              justifyContent: "center"
-            }}>
-              <Typography>
-                No Sensors Found  
-              </Typography>
+          {expanderAddresses.length > 0 && 
+            <Box marginBottom={3}>
+              <Typography fontWeight={650}>Detected Expanders</Typography>
+              {expanderAddresses.map((expAddr, index) => {
+                return (
+                  <I2CExpander key={index} address={expAddr}/>
+                )
+              })}
+            </Box>
+          }
+
+          {validI2CCompAddresses.length > 0 ?
+            <Box>
+              <Typography fontWeight={650}>Detected Sensors</Typography>
+              {validI2CCompAddresses.map((addr, index) => {
+                return (
+                  <ScannedI2C key={index} sensorNum={index+1} addressData={addr} deviceProduct={device.settings.product} componentSelectionCallback={componentSelection} availablePositions={availablePositions.get(quack.AddressType.ADDRESS_TYPE_I2C) ?? new Map<quack.ComponentType, number[]>()}/>
+                )
+              })}
+            </Box>
+          :
+            <Box sx={{
+                margin: 1,
+                display: "flex",
+                justifyContent: "center"
+              }}>
+                <Typography>
+                  No Sensors Found  
+                </Typography>
+              </Box>
+            }
             </Box>
           }
-          </Box>
-        }
         {scannedOneWire.length > 0 &&
           <Box>
             <Box justifyContent="space-between" display="flex">
               <Typography sx={{fontWeight: 650}}>
-                Pin Port Sensors
+                Pin Port Scan
               </Typography>
             </Box>
             {scannedOneWire.map((scan,i) => {
diff --git a/src/device/autoDetect/I2CExpander.tsx b/src/device/autoDetect/I2CExpander.tsx
new file mode 100644
index 0000000..f2a8183
--- /dev/null
+++ b/src/device/autoDetect/I2CExpander.tsx
@@ -0,0 +1,27 @@
+import { Box, Typography } from "@mui/material"
+import { quack } from "protobuf-ts/quack"
+
+interface Props {
+    address: quack.AddressData
+}
+
+
+
+export default function I2CExpander(props: Props) {
+    const {address} = props
+
+    const expanderType = () => {
+        switch(address.address){
+            case 0x71:
+                return "Grain Cable Expander"
+            default:
+                return "Unknown Expander"
+        }
+    }
+
+    return (
+        <Box sx={{marginY: 1}}>
+            <Typography>{expanderType()} {address.muxLine ? "Mux Line: " + address.muxLine : ""}</Typography>
+        </Box>
+    )
+}
\ No newline at end of file
diff --git a/src/device/autoDetect/ScannedI2C.tsx b/src/device/autoDetect/ScannedI2C.tsx
index 4719f66..3f1b461 100644
--- a/src/device/autoDetect/ScannedI2C.tsx
+++ b/src/device/autoDetect/ScannedI2C.tsx
@@ -108,6 +108,7 @@ export default function ScannedI2C(props: Props){
     <Box sx={{marginY: 1}}>
       {sensorNum && <Typography>Sensor {sensorNum}</Typography>}
       <Typography variant="caption">{addressData.expansionLine !== 0 && "Expansion Line: " + addressData.expansionLine}</Typography>
+      {/* may also want to specify the mux line, not sure if the sensors will have a mux line though */}
       {types.length > 0 ?
       <React.Fragment>
         <Grid2 container direction="row" alignItems="center" justifyContent="space-between">