Extended example to work with the 2 defined I2C buses on the badge

firmware/examples/i2c_scanner/.vscode/arduino.json

@@ -0,0 +1,6 @@
+{
+    "board": "espressif:esp32:nina_w10",
+    "configuration": "UploadSpeed=115200",
+    "port": "/dev/ttyUSB0",
+    "sketch": "i2c_scanner.ino"
+}

firmware/examples/i2c_scanner/.vscode/c_cpp_properties.json

@@ -0,0 +1,21 @@
+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+            ],
+            "browse": {
+                "limitSymbolsToIncludedHeaders": false,
+                "path": [
+                    "/home/rac/Arduino/hardware/espressif/esp32/cores/esp32"
+                ]
+            },
+            "intelliSenseMode": "clang-x64",
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        }
+    ],
+    "version": 4
+}

firmware/examples/i2c_scanner/i2c_scanner.ino

@@ -9,23 +9,40 @@
 
 #include <Wire.h>
 
+// Internal I2C bus where the sensor module is connected to
+#define SDA1 13  // GPIO35
+#define SCL1 0   // GPIO27
+
+// User I2C bus which is exposed in the 2 breakouts at the bottom of the badge
+// Note that those have the pullups not populated, 
+// depending on the module you connect you might need to populate them
+#define SDA2 2   // GPIO25
+#define SCL2 12  // GPIO36
 
 void setup()
 {
-  Wire.begin();
-
   Serial.begin(115200);
   delay(1000); // let serial console settle
   Serial.println("\nI2C Scanner");
 }
 
 
 void loop()
+{
+  scan("Internal I2C bus", SDA1, SCL1);
+  scan("User I2C bus", SDA2, SCL2);
+  delay(5000);           // wait 5 seconds for next scan
+}
+
+void scan(String busDescription, int sda, int scl)
 {
   byte error, address;
   int nDevices;
 
-  Serial.println("Scanning...");
+  Wire.begin(sda, scl);
+  Serial.print("Scanning ");
+  Serial.print(busDescription);
+  Serial.println("...");
 
   nDevices = 0;
   for(address = 1; address < 127; address++ ) 
@@ -38,7 +55,7 @@ void loop()
 
     if (error == 0)
     {
-      Serial.print("I2C device found at address 0x");
+      Serial.print(">> I2C device found at address 0x");
       if (address<16) 
         Serial.print("0");
       Serial.print(address,HEX);
@@ -48,16 +65,15 @@ void loop()
     }
     else if (error==4) 
     {
-      Serial.print("Unknown error at address 0x");
+      Serial.print(">> Unknown error at address 0x");
       if (address<16) 
         Serial.print("0");
       Serial.println(address,HEX);
     }    
   }
   if (nDevices == 0)
-    Serial.println("No I2C devices found\n");
+    Serial.println(">> No I2C devices found\n");
   else
     Serial.println("done\n");
-
-  delay(5000);           // wait 5 seconds for next scan
-}
+  delay(1000);
+}