arduino float to int


This is a real trap for beginners, and the issue often comes up in beginner forums. The reason for this difficulty is that information sent between the PC and the Arduino, such as this hello world string, is always transmitted as a sequence of ASCII codes as keeping the American Standard Code for information interchange. So, for example, whenever you write 685 and click send the PC actually sends the arduino a series of three distinct ASCII codes. This is the ASCII code for the character of six. This is the code for Athens is the code for five. How can we use this information to interpret incoming numbers in the Arduino first let’s. Take a look at an ASCII table. Here’S useful website called ASCII table comm and in it, we’ll find this useful ASCII table on the Left will have the indexes of the characters and in red and the characters themselves. These are non printables here are some punctuation marks, digits capital, letters etc. But if we go to 54, this index will see that this is the sixth character that I tapped in earlier now. You’Ll notice that the characters here of the digits are consecutive and their numbers are consecutive, also souls. 48. 49. 50. 51. This means that if we subtract 48 from each number that we get in the Arduino, you can actually decipher the digit that the user intended to send so back here I change this line B equals zero. The trade to B equals 0 serial trade 48 upload that into the Arduino, and you see that if I type 695 I get the six the eight in the five now.

This is great for deciphering individual digits. But what happens if I want to decipher their number? As a whole, the programming approach for this kind of problem is usually to take some non global variable such as this long time give it an initial value of zero and for each and every digit digit, and it comes alone. I do this I take. I multiply it by 10 and add of the new digital I’ll. Add some output lines, so you can see how it is surrounding that real time so to speak. Put here I equals and output by itself. Let’S upload that and if I write 685 you’ll, see that I is first zero multiplied by 10 plus 6, then 6 multiplied by 10 plus 8, then 68 multiplied it by 10 plus 5. So we have the number here. But this is a bit problematic, because how do you know we’ll just stop? Instead of doing this, I suggest a new method that’s built in into the Arduino serial object itself. This method is called serial, dot parseint and it actually does exactly what we did here. Only implicitly I just write, I equals serial dot parse and it doesn’t take any parameters, and if I run that you’ll see that’s it. When I write my number here, I get it as a complete number here now. You’Ll also notice that it took some time between my clicking or pressing enter and the appearance of the number.

This is because parseint guesses, when my number is, is done by wetting the predetermined timeout period. The default period is 1000 milliseconds, which is quite a lot. So we can change that and get the number of faster by writing here in setup right surreal that set timeout no here we should put the the number of Familia seconds. Not how long should we wait? Yeah in this bod rate of 9600, each character takes about one millisecond to send. So if we wait, let’s give it some confidence interval of 10 milliseconds. This would be quite enough if you were using the slower, baud rate. Of course, you should increase this and vice versa. Let me show you just how it works. You go 2016 and it appears almost instantly or you should be careful, because parsing can easily fall trap to the non principle of garbage in garbage out meaning if you write all sorts of garbage here but solve. It looks like a number to read this, as it extracts actually the numbers from these from this meaningless flow of characters, and you may not want that so either trust the user to be to be clever or be very clever, with your own code and don’t use Percent but again, this is a simple and straightforward way to get what you need in terms of getting whole numbers from the user that’s it for now. Thank you for watching.


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Making Art at Tam High




Originally posted 2018-04-17 07:24:04.

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  1. Line 9 while (Serial.available() — 0) does not work. It worked with while (Serial.available() – 0) {
    Secondly I am getting an additional number 10 (line feed, new line) at the end. Not a big issue, but why it didn’t show in your video? I shall tweak more, and may be find the answer myself. I shall look in your channel if you have some video on interaction (to and fro) with processing. Thanks for your video.

    1. In this comment you wrote “–” and “-” instead of “==” and “=”, maybe that’s the problem?

    2. Moments before I saw your reply, I noticed my mistake, when I saw the video again. I am still tweaking other parts of the program including using alphabets. Working fine so far. Thanks.

  2. I need to find a way to capture the oscillation point of a moving object.
    To visualize this, Picture a rail with a distance sensor at each end. The target would oscillate between the 2 end points with the center being 180. To the left the max measurement would be 270 and max 90 to the right. When the target moves to the right then switches direction I want to capture the farthest measurement lowest number serial data to trigger a device when the target is at a certain point on the left. Then I want to capture the oscillation point highest number on the left to in turn trigger the device at a certain point on the right. Due to changing loads on the device being triggered the oscillation points will change randomly.

    Can this be done?

    Below is a rough draft of comments without any code.

    //Arduino uno

    // vl53l0x sensors
    // distance sensor1 value 181 to 270 degrees
    //distance sensor2 value 179 to 90 degrees

    //1 stepper Nemo 17 or 23
    //Stepper full rotation 0-359 steps (clock wise count 0 north)
    //Home 180, max rotation from 270 to 90 degrees.
    // orientations. 270 right, 90 left.
    //sensors placed at the ends of a rail with oscillating target.

    //if sensor1 value oscillates set sensor1 to highvalue of oscillation
    Oscillation at 172-173-172 would set value at 173

    // if sensor2 lowalue is = 178
    // run stepper to 183 when sensor1 reaches 182 //1degrees
    // if sensor2 lowalue is =177
    // run stepper to 184 when sensor1 reaches 183
    // if sensor2 lowalue is =176
    // run stepper to 185 when sensor1 reaches 184
    // if sensor2 lowalue is = 175
    // run stepper to 186 when sensor1 reaches 185
    // if sensor2 lowalue is =174
    // run stepper to 187 when sensor1 reaches 186
    // if sensor2 lowalue is =173
    // run stepper to 188 when sensor1 reaches 187
    // if sensor2 lowalue is = 172
    // run stepper to 189 when sensor1 reaches 188
    // if sensor2 lowalue is =171
    // run stepper to 189 when sensor1 reaches 188
    //Etc……. to lowvalue of 90
    //use < at end max run to 270 //If sensor 2 value oscillates set sensor2 to lowvalue of oscillation Ocilation at 186 - 185 - 186 would set value at 185 // if sensor1 highvalue is 182 // run stepper to 177 when sensor2 reaches 178 // if sensor1 highvalue is 183 // run stepper to 176 when sensor2 reaches 177 // if sensor1 highvalue is 184 // run stepper to 175 when sensor2 reaches 176 // if sensor1 highvalue is 185 // run stepper to 174 when sensor2 reaches 175 // highvalue of 270....... //use > at end max run to 90.

    1. That’s some question… 🙂 First, I don’t see how this relates to the Serial Monitor, which is essentially just a primitive text interface for the user. Second, you can definitely create a formula or two to define the relation between the sensor reading and the required motor activation- it’ll save you endless lines of code. Third, how fast is everything going in the system? how accurate are the sensors and what kind of values do they give you (round numbers?) – these and other parameters can influence the performance of the code and make the difference between a working system and one that accumulates lags and errors until it doesn’t function at all. It requires more information and testing, not something one can do over YouTube comments 🙂

  3. Sorry I somehow got on the wrong video.. I was on one about data monitoring. I ordered several vl53lox sensors of different brands. They will be about 2 feet apart. I’m hoping to get some that are accurate to the mm. The machine will oscillate in 1/2 to 1.2 seconds depending on load.

    1. Again, this is not something that can be sorted out in YouTube comments. If you have a local Makerspace nearby, I think the best option is to go there and consult someone with background in machines as well as electronics. Good luck!

  4. Thank you! Your video is very helpful! But when I was doing a loop, sometimes “Serial.parseInt” came out the right number I put, like 1300. But sometimes it doesn’t work with the number like 1000. Do you know any reasons? Regards,

    1. There is no way the value you enter can effect Serial.parseInt (if the values have the same number of digits). The only factor is the time interval between the digits – or if there’s some hardware problem in transmitting the data.

  5. I used your code from 4:03 and after I enter a number it’s gives me the same number along with a zero, does it mean the serial monitor also takes in the enter key ascii value and uses it in the program?

    1. Exactly. Take a look at the bottom of the Serial Monitor window, the drop-down menu with “No line ending”, “Newline” etc. In my video, “No line ending” is selected – you probably have one of the others, which send extra control characters.

  6. why when i take 2 user inputs consequently serial leaves me enter the first one but it puts the 2nd value zero by default ???

    1. Your serial monitor is probably sending an end-of-line character after the that’s registered as an invalid number. Select “No line ending” from the drop-down menu at the bottom.

    1. Just write a Serial.praseInt() followed by a Serial.readString(), it will automatically separate the number at the beginning of the input from the rest. The real question, and a more difficult one, is how to verify that input is formatted correctly!

  7. Many thanks for the video… Could you help me a little bit… ? How can i store these values (numbers) read in an array ? Actually these numbers are HOURS and MINUTES that will be used in the RTC3231 module.
    Regards, thank you in advance.

    1. Just like I assigned the return value of parseInt into a variable, you can assign it into a cell in an array (e.g. “timeData[1]” or whatever you want to call it)


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