diff --git a/bridges/s3-bridge/s3_bridge.py b/bridges/s3-bridge/s3_bridge.py
new file mode 100644
index 0000000..cc69ee8
--- /dev/null
+++ b/bridges/s3-bridge/s3_bridge.py
@@ -0,0 +1,66 @@
+import serial
+import threading
+import time
+import sys
+
+REAL_PORT = "COM5"     # MiniMate hardware
+VIRTUAL_PORT = "COM4"  # Bridge side of COM3<->COM4 pair
+BAUD = 38400
+
+
+def hex_dump(data):
+    return " ".join(f"{b:02X}" for b in data)
+
+
+def forward(src, dst, label):
+    while True:
+        try:
+            data = src.read(1024)  # blocking read
+            if data:
+                print(f"[{label}] {hex_dump(data)}")
+                dst.write(data)
+        except serial.SerialException as e:
+            print(f"[{label}] Serial error: {e}")
+            break
+        except Exception as e:
+            print(f"[{label}] Unexpected error: {e}")
+            break
+
+
+def main():
+    print("Opening ports...")
+
+    real = serial.Serial(
+        REAL_PORT,
+        BAUD,
+        timeout=0.1,        # IMPORTANT: not zero
+        write_timeout=0.1
+    )
+
+    virt = serial.Serial(
+        VIRTUAL_PORT,
+        BAUD,
+        timeout=0.1,
+        write_timeout=0.1
+    )
+
+    print(f"Connected: {REAL_PORT} <-> {VIRTUAL_PORT}")
+
+    t1 = threading.Thread(target=forward, args=(virt, real, "BLASTWARE -> S3"), daemon=True)
+    t2 = threading.Thread(target=forward, args=(real, virt, "S3 -> BLASTWARE"), daemon=True)
+
+    t1.start()
+    t2.start()
+
+    try:
+        while True:
+            time.sleep(1)
+    except KeyboardInterrupt:
+        print("Stopping bridge...")
+        real.close()
+        virt.close()
+        sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file