automation of motor switch test2

src/controllers/tanksController.js

@@ -1494,6 +1494,7 @@ exports.IotDevice = async (req, reply) => {
       const waterCapacityPerCm = parseInt(existingTank.waterCapacityPerCm.replace(/,/g, ''), 10);
       const water_level = water_level_height * waterCapacityPerCm;
 
+      if (water_level >= 0) {
         existingTank.waterlevel = water_level;
       
         // Save the updated tank document
@@ -1513,6 +1514,8 @@ exports.IotDevice = async (req, reply) => {
         }
       }
       
+    }
+
     // Send the latest three documents
     const latestOttanks = await IotData.find({ hardwareId })
       .sort({ date: -1, time: -1 });