I make sure i dont use the int data type. On avr its 16 bit, on arm its 32 bit. Have been caught out with this before
I much prefer to be explicit
uint8_t
int8_t
uint16_t
int16_t
uint32_t
int32_t Answer from theboot on forum.arduino.cc
Linux Hint
linuxhint.com › convert-int-to-float-arduino
How to Convert int to float in Arduino – Linux Hint
The “float()” function converts ... another. In Arduino, typecasting from int to float is done by placing the data type you want to convert to in parentheses in front of the variable that you want to convert....
Arduino Forum
forum.arduino.cc › projects › programming
converting a float to integer - Programming - Arduino Forum
August 26, 2017 - Is it possible to write a function that gets float values and convert them to integers?
How to actually convert float to int?
int(float) returns wildly wrong values... I get that this is some kind of conversion error to be expected, I'm working with a float like 12345.67 and it comes out to weird numbers. ...but I really need to get an int from a float that is correct. I've been all over these forums and the internet ... More on forum.arduino.cc
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0
October 28, 2023quick question convert int to float
I have an int variable, how can I convert it to a float? Right now I have: int ledRowNumber; float ledRowNumberFloat; and I tried: ledRowNumberFloat = ledRowNumber*1.0; I'm not sure if it's working. Should this work? More on forum.arduino.cc
9
0
July 5, 2017Int to float convertion[Solved]
Hi I am having issues with converting a Int variabel to a float variabel. In short i have a modbus register with two uint_16_ registers, i have combined them as Uint32_t with both big and little endian succsessfully. The issue are when im trying to take this: "Uin32_t ModbusRegister1" gives ... More on forum.arduino.cc
19
0
November 16, 2023How to change int to float??
i try to do some mathematics calculation on arduino ... but i dint get the same answer as i calculated in calculator... in this coding ... i expected to get the power = 3.124 x 240x 0.387 = 290.16... but the serial monitor show diff answer.... pls help me ... thank you void setup() { ... More on forum.arduino.cc
5
0
May 4, 2018Medium
medium.com › @pqshedy33 › how-to-convert-between-various-data-types-in-arduino-6bce1a11d867
How to convert between various data types In Arduino? | by Ampheo | Medium
January 10, 2025 - cpp int myInt = 10; float myFloat = (float)myInt; // Convert int to float
Arduino Forum
forum.arduino.cc › projects › programming
How to actually convert float to int? - Programming - Arduino Forum
October 28, 2023 - int(float) returns wildly wrong values... I get that this is some kind of conversion error to be expected, I'm working with a float like 12345.67 and it comes out to weird numbers. ...but I really need to get an int fro…
Arduino Forum
forum.arduino.cc › projects › programming
quick question convert int to float - Programming - Arduino Forum
July 5, 2017 - I have an int variable, how can I convert it to a float? Right now I have: int ledRowNumber; float ledRowNumberFloat; and I tried: ledRowNumberFloat = ledRowNumber*1.0; I'm not sure if it's working. Should this work…
Arduino Forum
forum.arduino.cc › projects › programming
Int to float convertion[Solved] - Programming - Arduino Forum
November 16, 2023 - Hi I am having issues with converting a Int variabel to a float variabel. In short i have a modbus register with two uint_16_ registers, i have combined them as Uint32_t with both big and little endian succsessfully. The issue are when im trying to take this: "Uin32_t ModbusRegister1" gives the value : 2923938625 (Correct) float(ModbusRegister1) gives the value : 2923938560.00 HEX version : AE47C341 As seen in the image below, i want it in the format of Float-Little Endian (DCBA) (24.41...
Arduino Forum
forum.arduino.cc › projects › programming
How to change int to float?? - Programming - Arduino Forum
May 4, 2018 - i try to do some mathematics calculation on arduino ... but i dint get the same answer as i calculated in calculator... in this coding ... i expected to get the power = 3.124 x 240x 0.387 = 290.16... but the serial monitor show diff answer.... pls help me ... thank you void setup() { Serial.begin(9600); int Current= 3124; int Voltage= 2400; int Pf = 387; float current = float (Current); current = current/1000; Serial.println (current); float voltage = float (Voltage); voltage = voltage/10...
PlatformIO Community
community.platformio.org › t › union-convert-int-to-float › 30678
Union - convert int to Float - PlatformIO Community
November 26, 2022 - Hi, Not sure what is happening, but i am tryign to convert int values to float using union with the following code: #include #include #include float tmpfloat; union u_tag { int b[2]; float fval; } u; void setup() { Serial.begin(9600); // TX0/RX0 serial monitor } void loop() { u.b[0] = 12456; u.b[1] = 3652; tmpfloat = u.fval; Serial.println("Result Converted to Float: "); Serial.println(u.b[0]); Serial.println(u.b[1]); ...
Arduino Forum
forum.arduino.cc › projects › programming
Transform int to float - Programming - Arduino Forum
February 3, 2018 - Hi, I would like to transform an int to a float but changing the decimal points. Example: int a=1235; float x=0; I would like to store a on x such that I have x=12.35; I won't explain why i need to do something lik…
Arduino
arduino.cc › reference › en › language › variables › data-types › float
float | Arduino Documentation
May 15, 2024 - arrayboolbooleanbytechardoublefloatintlongshortsize_tstringString()unsigned charunsigned intunsigned longvoidword ... 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.
TheLinuxCode
thelinuxcode.com › home › the complete guide to converting int to float in arduino
The Complete Guide to Converting int to float in Arduino – TheLinuxCode
December 27, 2023 - Here are common examples that require converting an int to float: The Arduino analogRead() function returns a 10-bit integer between 0 and 1023 corresponding to 0V and 5V on the input pin.
Top answer 1 of 2
2
LED_CYCLE_TIME is zero because you don't use floating point division ((1 / F_LEDS) / 2 is (1 / 5) / 2, but 1 / 5 == 0, so it's 0).
Just use doubles: #define LED_CYCLE_TIME (0.5 / F_LEDS)
And you also need some extra brackets around your defines, since currently OVERFLOWS_PER_CYCLE is defined as (unsigned int)((1 / F_LEDS) / 2 / 1 / F_CPU / 256.0), which does the division left-to-right instead of in the correct order.
So your corrected code:
#define OF_FREQUENCY (F_CPU / 256.0)
#define SECONDS_PER_OF (1 / OF_FREQUENCY)
#define F_LEDS 5
#define LED_CYCLE_TIME (0.5 / F_LEDS)
#define OVERFLOWS_PER_CYCLE (unsigned int)(LED_CYCLE_TIME / SECONDS_PER_OF)
2 of 2
1
The arithmetic can be considerably simpler and can be performed without the need for floating point.
Consider that LED_CYCLE_TIME is:
1 / (2 * F_LEDS)
and that you are dividing that by SECONDS_PER_OF. But that is the same as multiplying by the reciprocal of SECONDS_PER_OF, and you already calculated that as OF_FREQUENCY. So now you have:
1 / (2 * F_LEDS) * OF_FREQUENCY
which is the same as:
OF_FREQUENCY / (2 * F_LEDS)
So what you end up with in code is:
#define OF_FREQUENCY (F_CPU / 256)
#define F_LEDS 5
#define OVERFLOWS_PER_CYCLE (OF_FREQUENCY / (2 * F_LEDS))
Or better:
#define LED_PRESCALER 256
#define F_LEDS 5
#define OVERFLOWS_PER_CYCLE (F_CPU / (LED_PRESCALER * 2 * F_LEDS))
Which given F_CPU == 16000000 is 6250 and requires no floating point.
TutorialsPoint
tutorialspoint.com › convert-string-to-integer-float-in-arduino
Convert string to integer/ float in Arduino
March 24, 2021 - void setup() { Serial.begin(9600); Serial.println(); // put your setup code here, to run once: String s1 = "235"; String s2 = "1.56"; String s3 = "Hello"; int i1 = s1.toInt(); int i2 = s2.toInt(); int i3 = s3.toInt(); float f1 = s2.toFloat(); float f2 = s3.toFloat(); Serial.println(i1); Serial.println(i2); Serial.println(i3); Serial.println(f1); Serial.println(f2); } void loop() { // put your main code here, to run repeatedly: } ... As you can see, the integer and float conversions for "Hello" are 0.
Arduino Forum
forum.arduino.cc › projects › programming
Int to float - Programming - Arduino Forum
August 4, 2015 - I try to convert int to float and be able to see the extra 00.0043534 digits but then i convert the int to float the float still remain int and i got as output 1.0000 and 2.000.. code: int x =10564; float xp; xp = x / 654; // 10564 / 654 = 16.1529 File dataFile = SD.open("datalog.txt", FILE_WRITE); if (dataFile){ dataFile.println(xp, 4); dataFile.close(); 10564 / 654 = 16.1529 but what i get as output is 16.0000 is that because of the dataloger? or i do something wrong?
Sparkfun
cdn.sparkfun.com › assets › resources › 4 › 4 › Arduino_programming_part2_slides_3up.pdf pdf
Arduino Programming Part 2 EAS 199A Lecture 6 Fall 2011
int a, b, c; a = 4; b = 3; c = ... z · Arduino Programming Part 2: EAS 199A · Use conversion functions to change type · Convert to an integer: a = int(x); Convert to a floating point value: x = float(i); Practical Advice ·...
GitHub
github.com › arduino › Arduino › issues › 8751
Converting float to int · Issue #8751 · arduino/Arduino
April 4, 2019 - float answer = 0.0; float i = 0.0; void setup() { Serial.begin(115200); Serial.println("Hello World !!!"); } void loop() { while(true) { answer = pow(5.0, i); Serial.print("Answer: "); Serial.println(answer); if (i >= 4.0){i = 0.0;}; //preventing overflow int b = static_cast<int>(answer);//converting to int Serial.print("B: "); Serial.println(b); delay(500); i += 1.0; } }
Author arduino
Arduino Forum
forum.arduino.cc › projects › programming
Casting int to float type to do average - Programming - Arduino Forum
July 7, 2019 - Hi, I want to do an average and this is my code: int pulse_R, pulse_L; float average_speed = (pulse_L + pulse_R) * 1.0 / 2; I'm hoping that it's correct? I did some research and i found that the '1.0' is needed inste…
YouTube
youtube.com › watch
Convert Data Types - Arduino Uno Programming Basics - YouTube
Convert Data Types - Arduino Uno Programming BasicsIn this video I show you how to convert data types usingimplicit and explicit casting. Sometime the outcom...
Published July 20, 2024
Arduino Forum
forum.arduino.cc › projects › programming
How to change integer to float? - Programming - Arduino Forum
1 month ago - I have a SparkFun RedBoard (Uno) that reads 4 analog inputs and scales them to output to 4 Sparkfun Qwiic HT16K33 displays. The Arduino sketch (from Github) is displaying integers only. I need channel A0 in the format: -40.0 to +40.0 Thanks. Marty #include #include // I²C addresses for Qwiic Alphanumeric Displays const byte displayAddresses[4] = {0x70, 0x71, 0x72, 0x73}; // Create display objects for each address HT16K33 displays[4]; // Analog p...