What this boils down to is that both byte and boolean will be written as "binary" bytes, not converted into decimal.Īs Majenko says, things are different today, and boolean is now equivalent to bool which is promoted to int.ĮlectroManiac did not respond to a question about what version of the IDE s/he is using, however my point is that for some versions of the IDE my explanation is true. So you can see that the overload for print and println treats an unsigned char (effectively uint8_t) to be printed with BYTE default treatment and not DEC treatment.Īnd the writing is done thus: void Print::print(unsigned long n, int base) Virtual void write(const uint8_t *buffer, size_t size) Void printNumber(unsigned long, uint8_t) Now if you look at the Print class in that release: class Print So you can clearly see that boolean and byte are the same, and therefore that using boolean would be treated as byte. Looking at, for example, Arduino pre-release version 0023 I see in the file wiring.h: typedef uint8_t boolean What you mean by "is a typedef for bool" is in some (later) versions of the IDE. bool gets promoted to int, not byte - Majenko If you insist on using the boolean type, then a reasonable way of printing would be: Serial.println(buttonState ? "HIGH" : "LOW") īoolean is a typedef for bool. I raised the issue almost 4 years ago, and no-one is even assigned to this particular task. I have tried to get the Arduino developers to improve the documentation in this respect, something they have declined to do. If they had said it returns true or false you might reasonably put the result into a boolean field. BTW, neither of those values are, per se, booleans. Unfortunately the documentation for digitalRead on the Arduino site does not mention the datatype, it just mentions that it returns HIGH or LOW which isn't very helpful to help you work out what data type to use. What I am guessing is happening is that the version of the IDE you are using does not have an overloaded function for Serial.println that takes a boolean argument, and the compiler is casting it to byte, in which case it would print as 0x00 (LOW) or 0x01 (HIGH) which are not printable characters.
#ARDUINO SERIAL PRINT CODE#
Thus, the correct data type for buttonState in your code is int. The function prototype in Arduino.h is: int digitalRead(uint8_t)
First, you are not supposed to use boolean with digitalRead.
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