Thank you guys! Yes I can declare last_tempC but it stores just one value. But I woild like to store more values, it can be in one variable e.g. with delimiter * such as 21.523.122.1, but when I print it in serial, then just first 42 chars are shown. What am I doing wrong please?
And how can I please calculate how many temperatures can I store in memory?
Sorry for noob questions 