The lcd. C strings are basically stored as pointers to the first character of the string. So when you tried lcd. These are some examples. You could also use create a sufficiently large char buffer and use sprintf from stdio. I got the same problem and I printed the string and the integer on the same line by moving the cursor like this :.
This gives "34 " when number is 2. This is because that is the result of adding 2 to the string literal pointer, i. Please use separate print statements instead:. Do not use String to concatenate strings. That is a waste of SRAM, processing and has a risk of heap fragmentation. Simply a bad idea in small scale embedded systems such as AVR. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 3 months ago. Active 5 months ago.
Viewed 41k times. How do I print a string and integer on an LCD?
Displaying FLOAT variables in Arduino
When I try: lcd. I want it to print: 2 Please help! Active Oldest Votes. TisteAndii TisteAndii 2, 2 2 gold badges 8 8 silver badges 18 18 bronze badges. I got the same problem and I printed the string and the integer on the same line by moving the cursor like this : lcd. Column 13Line 2 lcd. Justin Justin 21 2 2 bronze badges. What is wrong with this: lcd. Please use separate print statements instead: lcd.
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Related 1.Programming is very interesting and creative thing if you do it with love. Your blog code helps a lot to beginners to learn programming from basic to advance level. I really love this blog because I learn a lot from here and this process is still continuing.
Love from Pro Programmer. The integer method is neat, but it has a little quirk: You are right the example is not working perfectly. This should work. Thank you.
Hello, How is it possible to append in the same buffer more values e. Thank you! Thanks YAAB, you solved my problem neatly. It is actually easy to make the first example work with negative values. The problem is that with a -ve the part of the result after the '. To solve this just "absolutize" the decimal part argument to sprintf I have not got it my friend. Im a beginner in arduino.
I would have expected it to be set already by default, since Arduino does not save on resources otherwise December 30, How to sprintf a float with Arduino. Arduino has a small limitation in sprintf function that does not print correctly float numbers. Email This BlogThis! Labels: arduino. Unknown June 10, at AM. Unknown August 12, at AM. Anonymous August 23, at AM. Bruno August 30, at AM. Anonymous January 30, at AM. Unknown July 26, at AM. October 20, at PM.
Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. It only takes a minute to sign up. I have a similar problem than the discussed here : How to display variables on 0. I'd like to know how can I show float variables in place of int variables. What should i modify in this part of my code? The printf group of functions in the Arduino library don't implement float and double conversions. For those, you need the function.
The u8glib library provides the Arduino's standard print method. You can the write:. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
How to display float variables on oled display 0. Asked 7 months ago. Active 6 months ago. Viewed times. Filip Franik 1, 1 1 gold badge 4 4 silver badges 18 18 bronze badges. Daniel Oliveira Daniel Oliveira 1 1 1 bronze badge. Is this code working for you? If not, what happens wrong? What means "does not work"? Active Oldest Votes. Conversion is done as "[-]d. The minimum field width of the output string including the '.
Returns buf. JRobert JRobert You can the write: u8g. Edgar Bonet Edgar Bonet Sign up or log in Sign up using Google.Pages: . Topic: Serial. Hi, following code "should" return numbers with decimal points and three digits after the comma but it does not: the first number remains 0.
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Code: [Select]. Re: Serial. Your mistake is that you are doing integer math and then saving the result in a float. A simpler way to display a floating point value with three decimal places is to specify the number of decimal places in.
Johnwasser, you made my day!! Thank you, and I add this one to my ever increasing list of learning points! Quote from: johnwasser on Sep 19,pm. Quote from: brice on Sep 19,pm. The 'current' that you print is not the same 'current' that you calculate. The calculated 'current' is a local variable, only in scope inside the 'for' loop.
Please do not PM me for help. I am not a personal consultant. And others will benefit as well if you post your question publicly on the forums.
The analogRead needs to be inside the "for" loop if you want to average 10 different values. The division by 10 needs to be done after the addition of the 10 values. Quote from: cattledog on Sep 20,am. OldSteve, cattledog, thank you! You cannot image how much I appreciate your input, johnwasser: you too. This is another one that I add to my list of learning points. Obviously I need to take more care in logical programming structure.
Quote from: OldSteve on Sep 20,am. To cattledog, thanks for pointing out; I had found this just before your posting but it still makes me feel silly.Pages:  2. Decimals on TFT. The float number has 2 figures behind the decimal point I only get the numbers before the decimal point on the screen.
The figure is the calibration factor off the scale. I'm using the 'itoa' function to convert the float to a char.
Code: [Select]. Re: Decimals on TFT. Most Arduino libraries support the regular Stream methods. Rob, Look the dutch version I think I found a solution. Quote from: robtillaart on Nov 15,am. Quote from: rowboteer on Nov 24,am. And it should cope with the rounding properly. Most inherit the regular Print class methods.
Perhaps his library does not. In the original sketch I used from JOS menu, there was a piece of code that helped with decimals. I am guessing that Ben has an integer variable that he wants to display as a decimal. I came to this thread hoping I would find some code to use as I need a function like Ben, but in my case to reduce a sketch size, display right justified parameters on a TFT and build strings for JSON messages. The TFT does support the print methods but at a cost of code size.
This function does not do that deliberatlely. This is the final solution I am using, as it was written whilst consuming some homemade mead the usual caveats apply! Post 12 has been updated to correct a bug where two lines of code were in the wrong order!Find anything that can be improved?
Suggest corrections and new documentation via GitHub. Doubts on how to use Github? Learn everything you need to know in this tutorial. Datatype for floating-point numbers, a number that has a decimal point. Floating-point numbers are often used to approximate analog and continuous values because they have greater resolution than integers. Floating-point numbers can be as large as 3. They are stored as 32 bits 4 bytes of information.
Arduino – Printing Float values to the Serial Port
If doing math with floats, you need to add a decimal point, otherwise it will be treated as an int. See the Floating point constants page for details. The float data type has only decimal digits of precision.How to print Big number/ integer on 16x2 lcd with Arduino Uno -- Arduino Tutorial
That means the total number of digits, not the number to the right of the decimal point. Unlike other platforms, where you can get more precision by using a double e. Floating point numbers are not exact, and may yield strange results when compared. For example 6. You should instead check that the absolute value of the difference between the numbers is less than some small number. If, instead, you want to round off during the conversion process, you need to add 0.
Floating point math is also much slower than integer math in performing calculations, so should be avoided if, for example, a loop has to run at top speed for a critical timing function. Programmers often go to some lengths to convert floating point calculations to integer math to increase speed. Language String. Language array. Language bool. Language boolean. Language byte. Language char. Language double. Language int. Language long.
Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. A better option would be to use dtostrf - you convert the floating point value to a C-style string, Method signature looks like:.
Arduino has its own String class. Constructs an instance of the String class. There are multiple versions that construct Strings from different data types i. On the other hand, sprintf doesn't format floats on AVR platforms! Learn more. Arduino sprintf float not formatting Ask Question. Asked 5 years, 3 months ago. Active 1 month ago. Viewed 57k times. F Any thoughts on how to format this float?
I need it to be a char string. Dinal24 2, 2 2 gold badges 14 14 silver badges 27 27 bronze badges. Mistergreen Mistergreen 1 1 gold badge 7 7 silver badges 14 14 bronze badges. Active Oldest Votes. Dinal24 Dinal24 2, 2 2 gold badges 14 14 silver badges 27 27 bronze badges. Worked fine in my case. Thumbs up! As has been stated before Float support is not included in sprintf on Arduino.
String class Arduino has its own String class.
I would say, obviously, but yes, that is an excellent point for people new to Arduino programming. Arduino's String class does not have a method that accepts float or double. This only works because it converts it to an integer.