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On the other hand, the condition of the second if is true: it is checked if the variable x is greater than 10 OR less than 20: as one of the conditions is already met -the first-, the total condition is already true regardless of what the rest of the conditions are worth present. This is because the condition of the first if is false: it checks himself if the variable x is greater than 10 AND AT THE SAME TIME if it is less than 20. Emphasize that string comparisons are case-sensitive (that is, the data of type String hello is not the same as data of type String HELLO).Įxample2:Equality operators in if statement in Arduino programming:Īs you can see only the statement 2″ and statement 3″. In this sense, comparing whether one string is greater or less than another simply means evaluating the strings in alphabetical order character after the character. In the case of strings, however, keep in mind that you can only use the comparison operators when both strings have been declared as String objects: if they are character arrays, they cannot be compared. In general, the if is capable of comparing decimal numbers as well: in the previous example, if number is a variable float and we substitute Serial.parseInt() By Serial.parseFloat() we would get the same behavior. When executing this sketch through the Serial monitor, which We will see is that every time we send some data to the plate, it will respond to us with any of the three possibilities. And if it is not yet, there is only one option left: that is greater than 23. If not, then it checks if its value is less than 23.
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And this is when another if arrives which checks if the value of number is equal to 23. The moment the condition is true, what we have inside the first if is the Serial.parseInt() function that recognizes and extracts everything that is sent through the serial channel (for example, using the Serial monitor) a whole number, assigning it to the variable number. Instead, if the condition turns out to be false (that is, if Serial.available () returns 0 and therefore there is no data to read), note that the function Loop() does not execute anything.
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If so (that is, if the value returned by Serial.available () is greater than 0), all instructions inside. In the above code a first if appears that checks if there is data in the input buffer of the TTL-UART chip pending to be read.
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