The error says that String(float&) is ambiguous, so I'm guessing you have another namespace with a String definition in it which is conflicting with the Arduino version. ![]() Each microcontroller has its own Arduino Core: AVR, SAMD, ESP8266, ESP32. ![]() (Quite often when you reduce it to the simplest example, you learn what the problem is anyway!) The cause of this error is: Arduino does not know how to print a uint64t How Arduino Prints Stuff Arduino contains a subset of C++ standard library, plus some additional headers known as the 'Arduino Core'. Generally with these sorts of problems, you should reduce the code to the simplest example which shows the error and post that whole example in the thread. the definitions of some_float and some_value When changing the url link, the graph does not appear. I want to put this value in html so that the graph moves in real time. The last example you gave that gives 'similar errors' looks like it should work when you remove the extra open bracket, according to the docs.ĮDIT: in reference to the new error message "> call of overloaded ‘String(float&)’ is ambiguous" can you paste some additional code to show at least: The value of the temperature and humidity sensor is measured through the Arduino and appinventor outputs it. String stringOne = String(5.698, 3) // using a float and the decimal places There is an example of this on the doc page you linked: The error was that I was writing 17 bytes. You'll need to convert your float into a String then add the two Strings together. Mifare cards have a limitation of 16 bytes x block and you cant write on protected blocks like 0, 3, 6 etc. The docs say the + operator only supports adding two String types together. When the compiler of Arduino IDE is unable to recognize any variable or is unable to process any loop or any instruction having any undeclared variable. ![]() Next, as the error says, you are attempting to add a float value to a String type. First, you have an extra open bracket in all of your tests.
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