fix(control): prevent issues with wrong inputs

controller/controller.ino

@@ -139,7 +139,7 @@ void loop() {
     if (gMode == "SERIAL" and Serial.available()) {
 
         float input = Serial.parseFloat();
-        if (input == 0) {
+        if (input <= 0) {
             StopMotor(gEsc_val);
         } else {
             gEsc_val = FreqToEsc(input);