diff --git a/api/Things4Java/Things.Robot/src/main/java/org/things/robot/Robot.java b/api/Things4Java/Things.Robot/src/main/java/org/things/robot/Robot.java
index 2c89448..05ae684 100644
--- a/api/Things4Java/Things.Robot/src/main/java/org/things/robot/Robot.java
+++ b/api/Things4Java/Things.Robot/src/main/java/org/things/robot/Robot.java
@@ -142,7 +142,7 @@ public static int sensorLuz() {
     public static int sensorDistancia(int i) {
         int r1 = -1;
         try {
-            robot.send("sd1");
+            robot.send("sd" + i);
 
             String r = robot.receive();
             r1 = Integer.parseInt(r.substring(3, r.length() - 2));