How to send integers to arduino via serial?

I want to send integers to Arduino via a serial connection. For example, when I send "1" the data received by Arduino is "49" and when I send "a" the data received by Arduino is "97"

There are two functio开发者_运维知识库ns in Python, ord() and unichr(). They behaved like this:

unichr(97) = u"a"
ord(u"a")=97

Are there equivalent C functions?

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Use the alphanumeric to integer function.

You may also find header cstdlib, stdlib.h, C Standard General Utilities Library useful. Although it says C++, this particular section is the standard C library. Notice that you can use C++ with Arduino.

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As long as you have your characters stored as their ASCII-value, the easiest way - if your goal is converting single digits - is to subtract the ASCII-value of 0: '8'-'0' will give you the unsigned char value 8. You need to make sure it's a digit and not some character, but that is easily done by just checking if the result is below or equal 9.

Similarly, you get the ASCII-value of a single digit z by adding the value of '0'.