added more detail in I2C sensor failures

cubesatsim/cubesatsim.ino

@@ -3012,11 +3012,11 @@ void start_ina219() {
 	
   sleep(0.1);
   if (!(i2c_1 = ina219_1_0x40.begin()))  // check i2c bus 1
-    Serial.println("I2C bus 1 0x40 not found");
+    Serial.println("I2C +X sensor (bus 1 0x40) not found");
   if (!(i2c2 = ina219_1_0x41.begin()))
-    Serial.println("I2C bus 1 0x41 not found");
+    Serial.println("I2C +Y sensor (bus 1 0x41) not found");
   if (!(i2c3 = ina219_1_0x44.begin()))
-    Serial.println("I2C bus 1 0x44 not found");
+    Serial.println("I2C Batt sensor (bus 1 0x44) not found");
 //  ina219_1_0x45.begin();
 	
   i2c_bus1 = i2c1 || i2c2 || i2c3 || i2c4; 	
@@ -3026,13 +3026,13 @@ void start_ina219() {
   Wire1.begin(); 
 	
   if (!(i2c5 = ina219_2_0x40.begin(&Wire1)))  // check i2c bus 2
-    Serial.println("I2C bus 2 0x40 not found");
+    Serial.println("I2C +Z sensor (bus 2 0x40) not found");
   if (!(i2c6 = ina219_2_0x41.begin(&Wire1)))
-    Serial.println("I2C bus 2 0x41 not found");
+    Serial.println("I2C -X sensor (bus 2 0x41) not found");
   if (!(i2c7 = ina219_2_0x44.begin(&Wire1)))
-    Serial.println("I2C bus 2 0x44 not found");
+    Serial.println("I2C -Y sensor (bus 2 0x44) not found");
   if (!(i2c8 = ina219_2_0x45.begin(&Wire1)))
-    Serial.println("I2C bus 2 0x45 not found");
+    Serial.println("I2C -Z sensor (bus 2 0x45) not found");
 	
   i2c_bus3 = i2c5 || i2c6 || i2c7 || i2c8;