How to convert an INT to a CHAR for a CSV file?

Using Arduino Programming Questions
1

Hi folks, I'm trying to make a data logger which will take the time and date from an RTC, measure a voltage, and then record all this data to an SD card.

I have working code for the reading the RTC, and working code for writing to the SD card.

My query is this... I want to write the date, time, and voltage to the SD card in CSV format. So, I need to set up a CHAR array with the date, time, and voltage all separated with commas. However, the date, time, and voltage are INTs. How do I convert the INTs to CHARs?

For example:
if the minutes from the RTC are 28, this needs to be converted to two ASCII characters, the ASCII character for the number 2, and the ASCII character for the number 8 so that the two characters can be written to the CHAR array.

Any help appreciated!

Thanks,

Andy.

2

itoa?

3

You can write your own function to do this too.
Separate the digits then add '0' to each to get a char

.

4

sprintf() will allow you to format the whole string at once into your char array.

5

Why do you think you need to invent/use some function to convert an int to a string (NOT a CHAR)? Do you really believe that the File class can't do this?

6

Hi guys, thanks for all your replies.

evanmars, itoa worked a treat. Cheers!