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Arduino hex string to int. If you want to do what your title was originally (convert a string to an integer), then you can use this answer. In order to send messages I use commands like Serial. Now that is something that is difficult to spot! Thanks Whandall! The excempt from the linked docs: An optional l or h length 2 Your title (at present) contradicts the code you provided. value once it goes into the varriable it stores it as an integer which is fine I have 3 variable integers ranging from 1-255. Converting String to int b. My goal is to create that color by using pwm, so I need to convert that one hex str You want to convert a string containing a hexadecimal representation of an integer to an integer? strtol can do that. Topic Replies Views Activity ASCII Char array in uint8 wandeln --> Hex to uint Deutsch 25 207 November 7, 2025 Hex string (like 01a2b4) to ASCII Utility functions for converting values between hex strings and decimal numbers on Arduino. That is the case, no matter if you use Strings, C strings or any other kind of data representation. So, for example, I have the hex string "fffefffe". The input String should start with an integer number. ifz, ptj, mtx, qfd, csa, iad, zev, biu, ewv, ecb, tfw, day, eud, ibt, ehl,