Decimal to string arduino

Decimal to string arduino. Is there any way I can easily integrate it with this code: Serial. Hey, I'm working on this little project for some fun and I can't seem to get the unit to work the way I want. The code below was taken from that example. Example 2: String to Integer conversion Arduino. number1 = (dht. 03 needs turning into a fraction. " double ambientTemp=44. Apr 8, 2020 · Hello, I need help with a function that converts a decimal integer (variable in length) to a Hexadecimal string. SHT3x thermometer measures 24. system July 18, 2012, 3:32am 1. println(reg,4) Obviously it works, but i guess this is not the most effective (both in speed or size) since it introduce (unnecessary?) floating point operation. Forum 2005-2010 (read only) General Frequently-Asked Questions. read()); char relevant = c. The string knows how long it is. Learn String. val: a variable to format as a String - string, char, byte, int, long, unsigned int, unsigned long, float, double base (optional) - the base in which to format an integral value decimalPlaces (only if val is float or double) - the desired decimal places. 45", "123", and "123fish" are converted to 123. But arduino converts it to 24. val: the value to print - any data type. print(hex_number, DEC); Hint: "DEC" in the print can be omitted, because print () outputs decimals by default. T. string. String x= 7A2A. I can succesfully read the datas via Serial monitor (Serial. 00, and 123. โดย เจ้าของร้าน. 1 Like. decimalPlaces: only if val is float or double. read(); // <-- d_char will be a integer ascii code. serNum[4]); Serial. These numbers are displayed on a Liquid Crystal Display and Serial Monitor. 53. However, you can use other bases. which means a string of hex characters using ASCII (modes A to D). Feb 11, 2019 · String stringOne = String(13); // using a constant integer String stringOne = String(analogRead(0), DEC); // using an int and a base String stringOne = String(45, HEX); // using an int and a base (hexadecimal) String stringOne = String(255, BIN); // using an int and a base (binary) String stringOne = String(millis(), DEC); // using a long and a See full list on programmingelectronics. These numbers are displayed on a Liquid Crystal Display. Apr 6, 2020 · You do need to specify the number of decimal places you want: Serial. Then translate the remained into a character. such as number4 right now its posting 29 i'd like 29. ")+3); For rounded it yields: 3. Then these hex values need to be sent as; 0x105. Apr 29, 2021 · 在 Arduino 中使用 String() 函数将浮点数转换为字符串. Normally you'd do it by converting the string to a float. ' is decimal point. read(); // <-- c_char will be a character. 2 3 This sketch converts a Decimal number into a Hexadecimal number. If the converted value has fewer characters than the field width, it will be padded with spaces on the left (or right, if the left-adjustment flag has been given) to fill out the field width. toFahrenheit(temperature)); An integer or long integer variable, using a specified base. The numerator and denominator needs turning into a hex as well. write (incomingByte)); Also I can display it on LCD using LCD. Provides a function to convert a float to a string with a specified number of digits after decimal. Note: a 16 bit integer can be decomposed into two bytes as follows: unsigned int n = 697; byte upper = n >> 8; byte lower = n & 0xFF; SirMichael September 23, 2021, 3:32am 4. byte b_char = thefile. 0x1E. edited Apr 30, 2019 at 23:07. 29:07. The desired decimal places. 6 equivalent. dd:hh. My question is whether and, if yes, how it is possible to grab all the 5 elements of this array and put it on a character string. Converting the long to float : float reg=xxxxxxx/10000. Note that "123. mm. 02. system December 1, 2009, 6:37pm 1. String stringOne = String(5. 81; dtostrf(val, -7, 1, buf); // 7 characters with 1 decimal place and left aligned (negative width) How to use String. 00 respectively. system May 10, 2012, 10:09am 7. The parentheses add nothing. Hot Network Questions Sep 20, 2014 · Serial. Returns. an integer or long integer variable, using a specified base. 45, 123. 5. 456" is approximated with 123. Sep 6, 2023 · 1 Like. (Serial Oct 18, 2017 · Updated: Your Question re: String -> char* conversion: String. If you need all the bits ( 1234 = "0000010011010010" ) then use something like this: str[ i++ ] = bitRead( num, bitsCount ) + '0'; thnx for the relpay. 698, 3);// using a float and the decimal places This is called concatenation and it results in the original String being longer by the length of the String or character array with which you concatenate it. The strtol() function should do the conversion. Constructing a String from a number results in a string that contains the ASCII representation of that number. NumberStyles. print() the second digit is the number of decimal points: Utility functions for converting values between hex strings and decimal numbers on Arduino. an instance of the String The function dtostrf is the only way to convert a float to a string in an Arduino Uno (or other 8 bit Arduinos) - 32bit processors e. Oct 1, 2020 · hex string. More traditional way is using a bit shift: Hello, I am trying to receive message from CANBUS and combine the two bytes before converting the entire string into decimal number. println(val, format) Parameters. length is supposed be be the size of the buffer. Syntax. Constructing a String from a number results in a string that contains the ASCII representation of that number: The default is base ten, so: String thisString = String(13); gives you the String "13". Always check the input Sprintf() with Arduino cannot handle floating point values. Aug 13, 2012 · If so, you would need to build up a c string when you detect '"' followed by a '\' And then use this to convert it when you detect the closing. h lib. Then, it will perform a print function, using that float as the number to be printed. 14. 5 A function then converts this Decimal number to its Hexadecimal. Not if you want to just use that value in your code. HEX is just a way to represent the data. Read the documentation. write (incomingByte); I want to pick up just the numbers from message. The resulting string number has been rounded to nearest least significant digit. g. Can you guys tell me how to create a string from the datetime into a format like this: yyyy. print(rfid. 7, then you need to convert that float value to a character string first, and then print the string. remove() Function with Arduino. Here is a python function that does what you want. Feb 11, 2022 · Using Arduino Programming Questions. Jun 10, 2014 · I have a compass sensor that requires the data to be a float (needs to be divided by Pi for radian calculation) and leads to many decimal places of unneeded precision. i have a string with 11 bits in it in binary and would like to make this into a decimal how can i do it the stuff in the string looks like this 10111100111 and when this is converted to a decimal should be 3023. 50 - it adds zero at the end automatically. char x = 'a'; precision. So 0. Also you should be able to convert between the two using these: Or you can use a simple cast: { int d_char = thefile. the number in the binary will be changing and i need to make it into the decimal number to be able to do calculations with it Dec 29, 2017 · So when you divide a decimal number by 16, the remainder is one hexadecimal digit. ss. You have a couple of options: Use an unsigned int Sep 16, 2011 · String(val, base) String(val, decimalPlaces) Parameters. (Helpful for color conversion). Hexadecimal requires 4 characters and a null termination '\0'. ly/get_Arduino_skillsWant to learn more? Check out our courses!https://bit. Specifically - your problems here are that: char* c is a pointer that is never initialized. Arduino Converting [EP3] : Int to String. Allowed data types: string, char, byte, int, long, unsigned int, unsigned long, float, double. Arduino has a 2 byte int size meaning that the largest number you can store is 2^16-1 (65535). Using Serial. 要使用 String() 将浮点数转换为字符串，你需要两个参数来传递给该函数。. Mar 9, 2018 · In this tutorial we will see both integer to string and string to integer conversion. println (n); Dec 14, 2015 · The actual quesion: Arduino convert ascii characters to string. Nov 28, 2023 · Multiply the high byte by decimal 256 then add the value of the low byte. So 30 would 1E in hex and 1000 would be 3E8. The Arduino programming language Reference, organized into Functions, Variable and Constant, and Structure keywords. 14159; std::string num_text = std::to_string(number); std::string rounded = num_text. KeithRB: Oct 20, 2015 · Hello guys, I would like to convert a value from 'INT' (0 to 255) in binary (0000000 to 1111111) and then print it on the serial port to view it. /E. Sep 27, 2022 · String(val) String(val, base) String(val, decimalPlaces) Parameters. char* blah; //not used other than to fill a gap. ly/3pdkWVo***Get the code, tra Apr 28, 2015 · Using Arduino Programming Questions. charAt(0); Serial. Modify in place a String removing chars from the provided index to the end of the String or from the provided index to index plus count. Next the code converts the float value to string and appends to the current string (places it at the specified location). The code converts the whole float to string, but cuts all characters 2 chars after the ". lat(),6); What you are doing is assigning the result of this operation: (gps. Programming Feb 14, 2018 · You could do this three ways! Notice, if the number is greater than 65535 then you have to use a long variable. . // using an int and a base (hexadecimal): stringOne = String(45, HEX); // prints "2d", which is the hexadecimal version of decimal 45: Serial. Hello, I want to remove decimals after my original number in the monitor. I'm reading from a analog sensor and it appears that my numbers May 21, 2015 · I have this code: String c = String(BTLEserial. The purpose of this conversion is to further throw it on a SQL query to check if this "serial number" is Mar 8, 2014 · float difout = difsol * 1. Du kannst jedoch auch andere Basen verwenden. Alternatively use a union. An optional precision, in the form of a period . followed by an optional digit string. thank you Jan 10, 2017 · XnIcRaM: because Serial. 33. RudiAhlers June 24, 2013, 7:37pm 4. BUT this line of code is wrong: float latitude=(gps. Use an integer and treat the last two (or whatever) digits as decimals. println (difout,DEC); delay (1000); } I am aiming to get a two decimal solution from the difout but to the trained eye, I get gibberish. For example, use strchr (), isdigit (). println((char)inByte); // => prints an 'a' without the quotes Jul 17, 2017 · Using strings to compare numerical values is a very very bad idea. Only having 2 decimal places is causing issues in later code. 10. The contents is embedded in single quotes. If the floating point value you convert to a string has more digits after the decimal point than the number specified in the precision, then it will be cut off and rounded accordingly in the output string. Sep 2, 2022 · arduino. I'll do the rounding and I should get 24. Simple Arduino int to string example. 1. dtostrf is a useful function but can cause memory overwrite as explored above. That should be: int H = _T / 3600000UL; I need to print floats and ints in the Serial Monitor, and I would prefer that it always be two digits left of the decimal point in the cases of floats, and always two digits Jun 15, 2020 · Sometimes of HEX (8 chars) I got DEC as (9 chars), but I always need to get 10 DEC chars. another instance of the String object. UKHeliBob November 22, 2013, 5:09pm 3. The parenthesis operator is sure a strange one. xx 2 more places. Why do ppl post responses that don't answer the question? Not exact answer but casting with (char) will get you on the way there. Jun 22, 2017 · In order to find the bits of a single bit in a variable, you need to execute a mask on said variable. However I'm confused on how to actually use it. format: specifies the number base (for integral data types) or number of decimal places (for floating point types) So the solution: specift 7 decimal places when you print: Feb 14, 2012 · If you're starting with a char (one letter; it's what's returned by Serial. 0) * 5. print(test_float, 5); //prints with 5 decimal places. system November 22, 2013, 5:06pm 2. It's only when you output the value that it's rendered with a fixed (or limited) number of decimal places. Dies ist die hexadezimale Darstellung des Dezimalwerts 13. int a = 1234; String myStr; myStr = String (a); //Converts integer to string. toCharArray(char* buffer, int length) wants a character array buffer and the size of the buffer. location. e. Testing on my Arduino I get a totally different decimal. find(". Oct 29, 2014 · For some reason I can't use the Time. Mar 5, 2019 · Edwin101 March 5, 2019, 9:52pm 1. println(var1 + var2, HEX); //This should output 82 (or 0x82) Mar 20, 2015 · hello. For example, the Strings "123. But how can i put this into a String (or better a string array)? The next thing is to write the String to the digital Out Pins ( Pin 13 to 19). 1 ปีที่ผ่านมา. It will execute all operations separated with commas within the Oct 31, 2023 · We‘ve covered a lot of ground on the various methods for converting integer variables into strings in Arduino! To recap: Use String () for simple conversions and concatenation. substr(0, num_text. I need to convert a String value to its ASCII decimal value. Use sprintf () when you need formatting control like widths and decimals. All incoming bytes are the type int. Hexadecimal and decimal notation are just two different ways to express the same value. 2014. println(relevant); where BTLEserial. an integer or long integer variable. i. Apr 28, 2022 · It is the syntax of the print statement. set_minute(255); is the exact same thing as set_minute(0xFF); or set_minute(0b11111111); You only need to specify a format if you want a string representation of that number in a specific format. The next to debug lines show the contents and the length (using strlen of the string. or; An ASCII representation of the decimal value of the binary bit pattern. A String doesn't have an ASCII value, only individual characters, so just treat the constituent characters as "into"s, and you've done what you want. println() function). With decimals use float variable. protomoose April 28, 2015, 12:36pm 1. Apr 16, 2021 · float variables don't have a number of decimal places: that's how they get their name: "floating point" - the decimal point floats around as needed. Conversion of integer to string can be done using single line statement. The input String should start with a digit. Is it OK to add this function to Arduino? Dec 30, 2020 · Instead it's when you print that you decide how many decimals to display. and what you did is perfectly fine, and you should learn about String Class and its great set of member functions and operators and their ease of use. val: a variable to format as a String. 0 than send it with serial. 4 The Decimal number is fed to the Arduino through a 4x4 Keypad. def int2bin(n, count=24): """returns the binary of integer n, using count number of digits Du kannst jedoch auch andere Basen verwenden. Dec 13, 2017 · 0. I've seen a lot on the web, they just print things out. Converts a valid String to an integer. This would involve generating one, two or three bytes from a single byte input. May 13, 2024 · Description. Example input: Formula: decRes <<= 8; decRes += uid[i]; Thank you, Take a look at this. Jun 14, 2016 · Hello knee266, You basically don't convert HEX to another data type. I'm still learning about functions and pointers, so the inputs to this function I don't understand. A float or double, using a specified decimal places. So if you have to print something that has a decimal point, like 3. The + operator allows you to combine a String with another String, with a constant character array, an ASCII representation of a constant or variable number, or a constant character. You can add spaces if you really want them. a constant integer or long integer, using a specified base. read ()), the simplest way is to subtract '0'. In which case you can not convert all bytes into just a single byte BCD number. I want to get a word containing the binary value instead of a char array. This function automatically converts the `int` to an ASCII string and sends it to the serial port. float number = 3. any thoughts ? Regards Dec 29, 2009 · The idea is to send the binary string value to a LCD display. int num = 1234; May 13, 2024 · an integer or long integer variable, using a specified base. 32; // converts new number to difference measure of mass. xx(kg) + CR, where 'x' is number and '. You can use the toInt(), or toFloat() which require a String type variable. read(); // <-- b_char will be a integer ascii code. Data Processing. println(" "); The output is something like 245, 220, 58, 230, 245. May 30, 2014 · concatenate the string, like: strcat(valueString, buff); strcat(valueString, ", "); and clear the string like: strcpy(valueString, ""); Note that the 100 in the line "char valueString[100];", must be a number long enough to hold the entire string. println defaults to 2 decimal places for floats. jason123chat: I want to convert a hex number 80000000 to decimal, It is as easy as a single line of the code: uint32_t hex_number = 0x80000000; Serial. I've tested this using gcc on my Mac and it works well, giving me the correct decimal. If you're starting from a NULL-terminated string, you can use atoi (google it) Sep 23, 2021 · Try another way of explaining what you want to do. 12. when i try this number4 = (P*0. String test_string = String(test_float, 4); //converts to String with 4 decimal places. Jun 29, 2013 · An optional decimal digit string specifying a minimum field width. /* This sketch converts a Decimal number into a Hexadecimal number. Arduino has python. I receive it Oct 10, 2023 · However, note that this only rounds down. If the String contains non-digit characters, the function will stop performing the conversion. A handy way to do that is with dtostrf(), which converts a floating point value to a string. While working on a project with the Arduino, I was frustrated by the lack of double-to-string functionality. a float or double, using a specified decimal places. I'm converting that to a String, in the first line so that I can use the charAt function on it in the next. where string would be declared something like this: May 10, 2012 · Coding_Badly May 10, 2012, 6:11am 6. Jun 24, 2013 · Unless you create your own fixed decimal type, you are stuck with two options: Use float: Accuracy "and isn't always exact " is usually OK in practice. 0x3E8. print. com Apr 27, 2011 · Take a look at the Arduino String tutorial here. 5) * 100; Apr 10, 2020 · Hard to come up with a Subject that will make sense Since sprintf() can't accept floats, I found this bit of code to convert an integer to a String and add the decimal. println(stringOne); May 13, 2024 · a constant string of characters, in double quotes (i. 03/1 * 1000/1000 = 30/1000. , x = 102 would really be 1. Sep 7, 2020 · jremington September 7, 2020, 3:58pm 7. xxxx" and send the string over serial. String thisString = String(13); gives you the String "13". The easiest way to convert an `int` to a string in Arduino is to use the `Serial. May 13, 2024 · an integer or long integer variable, using a specified base. 14 or 156. Zum Beispiel: String thisString = String(13, HEX); Gibt den String "D" zurück. a float or double, using a specified decimal palces. ToInt32 (hexValue, 16); Is that C#? No. for an example , int Byte 1 : 7A int Byte 2 :2A. The Decimal number is fed to the Arduino through a 4x4 Keypad. println(var1 + var2, DEC); //This should output 130 Serial. A function then converts this Decimal number to its Hexadecimal equivalent. Globalization. a char array) a single constant character, in single quotes. Even ignoring the wasted memory and CPU time involved converting things to a string performing a string to string comparison to evaluate the value is often problematic at best. Seccessivamente would like to read and write every single bit and make comparisons with the IF function Apr 21, 2016 · char c_char = thefile. Binary requires 16 characters and a null termination '\0'. May 1, 2013 · Hello, I'm receiving from RS232 (via MAX232) datas; the word consist of 13 bytes and it is> =xxxx. Maintainer: Ted Toal. unsigned int integerValue = (unsigned int)strtol(string,&blah,4); //conver the string. This can easily be done with a for loop Jul 18, 2012 · Development Libraries. remainder of 0 goes into the character "0" the remainder of 15 goes into the character "F". Jan 16, 2023 · Nello, I have a project with an arduino and a nextion screen (Oled interactif) the nextion comunicate with the arduino using only a string of characters (no choice). Code. Then the decimal 0. Jan 20, 2018 · Produce a BCD (binary coded decimal) number. Jun 30, 2020 · The hex number for 261 is 105. I would like to convert the integer to a string in order to add special ASCII characters as a prefix and another as a suffix. 1 /*. how do I increase the decimal place in this code string computation, when i add it at end it just uploads the 2 to my thingspeak. a constant string of characters, in double quotes (i. Converts a valid String to a float. For example a decimal string requires 5 characters, space for a minus sign, and a null termination '\0'. i need to convert this value to decimal value. a constant integer or long integer. Serial. println ()` function. Dec 1, 2009 · Removal of Decimal Places - Frequently-Asked Questions - Arduino Forum. Aug 6, 2015 · You are trying to store the value 90208583 in an int. One possibility is to use the c-string functions and character type functions to find the ASCII decimal point in the buffer, and count the number of ASCII decimal digits following it. Take the quotient of the division, and preform the same process on the remainder. ในบทความนี้จะขอพูดถึงการเปลี่ยนชนิดข้อมูลจากจำนวนเต็ม (Integer) เป็นชุดอักขระ (String Jan 28, 2017 · convert HEX string to Decimal in arduino. read(); // ascii 97 received Serial. 0; float temperature = (voltage - . 123" or "-12345. Oder, wenn du das Binärformat bevorzugst: String thisString = String(13, BIN); Gibt den String "1101" zurück. println() is there only for checking if all is ok. Seems odd that I can't find any examples of this. The example is using 80 bits. May 13, 2024 · See also. LANGUAGE char. - benrugg/Arduino-Hex-Decimal-Conversion floatToString. Is there an elegant way of making 2-digit decimal numbers display with a leading zero, if below 10? The example code below works fine, except that today's date appears as "28/4/15" and times appear as "13:33:7", but what I want is "28/04/15" and "13:33:07" for alignment May 13, 2024 · a constant string of characters, in double quotes (i. 123" plus some control characters. Here a quick example: uint8_t var1 = 65; // Small int uint8_t var2 = 0x41 // Small int Serial. 0x22D9B634 is indeed 584693300. Feb 7, 2015 · First, it executes the toFloat () function on the instring String object. remove() example code, reference, definition. I know the Arduino only goes up to 16-bit ints so I used a long instead see below. The default is base ten, so. My application only requires a rounded integer that will range between 0-360. begin(9600); int sensorVal = analogRead(sensorPin); float voltage = (sensorVal / 1024. ESP32 will implement the full sprintf so you won't need dtostrf for Arduino float to string conversion. If the String contains non-integer numbers, the function will stop performing the conversion. Heads up as the toFloat() is very time consuming. Apparently your value is not stored as a c program unsigned long long because it is bigger than 64 bits. For example, the heading Sep 11, 2022 · Code. Jun 16, 2020 · Hello everyone, I have the following question. read() returns type Int. MM. When I try to store them in a variable, It doesn't seem to work or doesn't get returned correctly (I end up seeing inverted question marks in between characters :-/) Any help would be appreciated! Thanks, SN Nov 22, 2013 · Tks. Im working on a project about a wireless RF communication between 2 arduino's and on the reciever part i recieve a string of 1 and 0 that is stored in a string like this: uint8_t buf[8] = "01001000"; Those bits of 0 and 1 are the equivalent of ASCII character "H" in binary. 第一个是要转换的浮点数的值，第二个是浮点数数字中存在的小数位数。. println(val) Serial. Do I float both values or is my float placement incorrect and then please tell me what I am doing wrong with the print . Actually i am interested in the second option Aug 19, 2012 · Hi! Is there an easy way (or function) to convert a integer ( 1 to 128) to an 7bit Binary code array? I found the following function String(myInt,BIN) which works (tried it with the Serial. Can not convert it to string. 3600000 is not a valid int value. Jun 30, 2015 · If you don't need all the bits ( 1234 = "10011010010" ) then use itoa. I input a number (integer part and decimal part); The nextion concat both with a dot between integer and decimal, and send a string to the arduino like that: "+12345. The input String should start with an integer number. So a buffer of length 7. Dec 22, 2020 · 1. print(test_float); //prints with 2 decimal places. lat(), 6) to a float. Parse (hexValue, System. Author: Ted Toal. So even if you were writing to a WiFi client it would be: client. cc Integer Constants - Arduino Reference Serial Decimal to binary. How to convert decimal to hex in Arduino library. However, in the comments you mentioned: void ReactivePower(unsigned char data[], int dataSize) String reacP = String(data[dataSize - 5], HEX) + String(data[dataSize - 4], HEX); which means an array of bytes obtained from a stream of bytes using HDLC (mode E). For instance, if I want to know if the 4th bit of 00011001 in binary (or 0x19 in hex - same thing) is a 1 or 0, I would do this: byte variable = 0x19; byte mask = 1 << 3; byte answer = (variable & mask) >> 3; Power_Broker June 22, 2017, 7:00am 6. jremington: unsigned int n = 697; Oct 24, 2016 · The Arduino compiler uses IEEE-754 single precision floating point so if you convert the hex string to binary it should be in the right format to interpret as a float. Jan 11, 2018 · I want to convert a binary string I store from my two interrupts (ISR_INT1, ISR_INT0) into a decimal. I scoured the web and only found "dumb implementations" that only worked to a fixed precision and did not support larger ranges (outside the (long/int) boundaries). For example, the following code will send the value of the `n` variable to the serial port as a string: Serial. 00; String yourdatacolumn="yourdata="; String yourdata; double yourarduinodata=ambientTemp; yourdata = yourdatacolumn + yourarduinodata; I want the output to be string but because of yourarduinodata is double type. ATmega1280: Or can i use the following in Arduino? int decValue = int. Improve this question. Share. arduino. 0295333727,2); it just prints the 2. And 0x000000010 is 16, just 2 digits. The 3rd argument passed to dtostrf() is the precision, which is the number of digits to show after the decimal point. HexNumber); int decValue = Convert. Example 1: Integer to String Conversion Arduino. char inByte = 0; inByte = (char)Serial. 46. Jun 17, 2016 · Next it appends some text to the end of the string (not the end of the buffer) using strcat. print(temp, 1); cevepe April 28, 2022, 8:51pm 7. Jul 9, 2012 · Literal constants are ints, unless you explicitly state otherwise. base: (optional) the base in which to format an integral value. b707 September 7, 2023, 7:53am 10. Feb 20, 2017 · Hello folks, I need to convert 7 digit long int xxxxxxx become string "xxx. Sep 21, 2019 · Storing the latitude in a flot should work without any problems. Since the ASCII codes for numbers are in order, subtracting '0' means that '0' will become 0, '1' will become 1, '2' will become 2, and so on. Jun 18, 2021 · 🤩 Check out this Free Arduino Course 👇https://bit. The result of this is a 32 bit float, which will have a precision of around 6 or 7 decimal digits. static char buf[17]; char *convertBin( int v ) Aug 2, 2017 · Hello, I am try to convert the HEX String to Decimal value . May 10, 2016 · Why? Because Serial. println(temperature, 1); // Print with 1 decimal place Or to put it into a string: char buf[8]; // Room for 7 characters plus NULL terminator float val=23. Aug 29, 2010 · Instead of calling sprintf you could also use ltoa which consumes less resources and use the Streaming library if a single line or string concatenation is desired. Use dtostrf () for float precision in decimal places. vg cf nq tt ut yp yk tg wf xh