But the reading is done one byte at a time, and it reads the entire thing. r/arduino: A place for all things Arduino! In the original, the call to serial. In this video I explain how the Arduino EEPROM memory works. What is a buffer of bytes? Think of buffer as just another word for an array, list, whatever resonates with your programming experience. Each string. write(int) on the Arduino side and read the incoming value byte by byte into the correct bytes of your sensor var, but be aware, that a Arduino int might be shorter than a Core int. These useful eeproms use a simple I2C connection and are easy to setup and use. In the mentioned tutorial, we have used the base64. Below is the code for the receiver. Maybe my mistake is somewhere else. Relying on const to do this for some chips is a mistake, especially if you write a library. To me this meant storing a four byte long in four bytes. In this seventh installment of our articles on how to do Arduino Programming for beginners, we will take a look at working with text, or “strings”. If your two bytes represent a 16-bit binary number, the largest unsigned decimal value they can hold is 2^16-1 = 65535, so that would be 5 decimal digits. I'm new to RP3, but fairly comfortable with Arduino. None Example See also. Apart from that, I'm not sure about how well it works to send a bunch of bytes with serial. The first one is a function (created on the spot) which get the string read from Arduino and logs it. If you want to use the mutable version, use bytearray () method. Furthermore, if you start manipulating. Arduino - Arrays - An array is a consecutive group of memory locations that are of the same type. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. // It waits to recieve a client, then listens for commands to switch an LED on and off. Search Search. buf: the buffer to copy the characters into (byte []) len: the size of the buffer (unsigned int) Returns. Lots of sketches can have big strings in them. The second approach is to use a String data type instead of a char array. Why do you need it to be sent as a string? Just send a byte value and treat it as so in the Arduino. Sometime in your project you need to display output of keypad to LCD. The unsigned char data type, and byte data type will yield incorrect results and act as though they are signed types i. The Arduino can use the values to change the brightness of an LED as shown in this tutorial, however you could use it to modify the speed of a motor, or to pass on commands to another module. The "active" length can be established by a call to the strlen function. This serial communication occurs using RX (pin 0. Blinking An LED. Extract latitude and longitude from GPS signal in Arduino NEO-6m this video shows how to extract latitude and longitude from GPS signal in Arduino Ublox NEO-6M GPS Module and any other GPS modules. DIY Retro Look FM Radio with TEA5767 Module Project tutorial by Mirko Pavleski. The code can be download here - Google share. Add the following at the top of your program:. PROGMEM is a Arduino AVR feature that has been ported to ESP8266 to ensure compatability with existing Arduino libraries, as well as, saving RAM. I send two different strings by pressing and realising the mouse. You can look at the Arduino reference on the web to see all the others. The idea is you can prevent String from fragmenting the heap by using reserve(num) to pre-allocate memory for a String that grows. Bytes remaining – how many bytes of data left in the PC serial buffer New Serial Data – the latest string read from COM port, configured to terminate at ‘\r ’ Arduino sample rate – the actual time interval sent from Arduino is used to measure the actual sample rate. The least byte we use is the one byte. You may think “A is for Apple”, but to a computer, an “A” is just the number 65. Seems to be a bit complicated though I think. Note that this code is intended for a Mega since it will interpret the data received from the other Arduino and then print to the Serial Monitor what it received so that the user can check it. If you use letters and numbers are all under value 127 ('A'=>65, 'z'=>122), so byte or char is the same in this case. Basically String type variable in arduino is character array, Conversion of string to character array can be done using simple toCharArray() function. Python: Converting string to bytes object In this post, we will check how to convert a Python string to a bytes object. In this seventh installment of our articles on how to do Arduino Programming for beginners, we will take a look at working with text, or “strings”. Apart from that, I'm not sure about how well it works to send a bunch of bytes with serial. 1 byte for closing \0; So it should be 1 * 6 + 6 * 6 + 10 + 1 = 53 unless I did some mistake. print(b, BYTE) prints b as a single byte followed by a carriage return and a linefeed. This fixes arduino#4452 and offers an easy implementation for issue arduino#4632. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. It returns either one of the three following codes:. Arduino There are cases in which you might want to send parameters from Unity to Arduino. So, I programmed Bluetooth in Android with the open sources provided. Supported Arduino Language Reference for AZ3166. Find this and other hardware projects on Hackster. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. You should also have a look at Introduction to Atmega328 , which is a microcontroller used in Arduino board. setField( 1, String(pressure));. One thing I found out about the ATmega328P chip, which is what the Arduino Nano uses, is that string constants are stored in data space. read() Returns the first byte from the serial buffer. Values will be displayed on the 16x2 LCD connected to each of the Arduino. Find anything that can be improved? Suggest corrections and new documentation via GitHub. write(b'sending string to Arduino') >>> ser. Arduino Retro Computer: BASIC Interpreter (Program Mode) My first step for the BASIC interpreter was to get the "Program Mode" working. r/arduino: A place for all things Arduino! In the original, the call to serial. When you are using this library, you need to consider variable byte size, because if you are using different platforms, then there may be some errors, because int on platform 1 has 4 bytes and int on platform 2 may has 2 bytes. toCharArray() Reference Home. Unfortunately, there are not very elegant ways to handle strings in C, so two functions had to be made by scratch to split the string. There is a function in serial library in Arduino called " Serial. By the end of the chapter, you will learn which type of string to use in a sketch. If your two bytes represent a 16-bit binary number, the largest unsigned decimal value they can hold is 2^16-1 = 65535, so that would be 5 decimal digits. By popular demand (meaning somebody asked :), in this article I will show how I store ASCII characters(1) in an I2C EEPROM, and then how I fetch them for display purpose. So, while the number of bytes is greater than zero, we will keep reading byte by byte with a call to the read method of the WiFiClient object, which will return a byte for each call. string: a variable of type String Returns. Writes binary data to the serial port. 3 Nanode Nanode is designed to work like an Arduino, but is made. String pieces[numberOfPieces] is now String pieces[4]) -I also changed the pieces String array to a long array and called toInt() on the substring. The application (performing the role of a server) is checking inside the loop() for an UDP packet to arrive. I want to do something like this : char array1 [25]; //with letters already in it. String to Int Function. You might ask how would you know the length of a string you are reading, for this I would save the length of a string also to the EEPROM in a set location then read that location first before reading the string its self. The receiver will then receive the byte array from the other Arduino and interpret it there. Maximum string length on one line with Arduino IDE? « on: November 09, 2015, 11:54:32 pm » Saw this: Wrapping long strings You can wrap long strings like this: char myString[] = "This is the first line" " this is the second line" " etcetera"; It would indicate that perhaps there is a limit to how may characters can be on string in one line. Avoiding string type variables is a good idea. The Arduino I²C bus can be accessed using the Arduino Wire As such sending or receiving a single byte data like a character or a stream of bytes like a string is very simple as shown by the. Now you are ready to roll! Run the processing script. That's what I tried first. If you use letters and numbers are all under value 127 ('A'=>65, 'z'=>122), so byte or char is the same in this case. getBytes() Parameters. String reserves a lot of memory for it self. Internally, it's represented as an array of characters. If you want to use the mutable version, use bytearray () method. In this video I explain how the Arduino EEPROM memory works. an instance of the String. //It will allow you to control up to 4 Atlas Scientific devices through 1 serial RX/TX line. We will study the Arduino UNO board because it is the most popular board in the Arduino board family. If your two bytes represent a 16-bit binary number, the largest unsigned decimal value they can hold is 2^16-1 = 65535, so that would be 5 decimal digits. String is basically character array terminated with null (0x00). Image to Byte array Use this online image to Byte array tool for converting (monochromatic) bitmaps to data arrays (C++ style). Once received into a buffer on the Arduino, these individual bytes need to …. I am establishing a serial connection with my Arduino. The Arduino Reference text is licensed under a Creative Commons Attribution-Share Alike 3. Here’s how to put big strings into read-only program memory and use them. String ip = “192. (but it does not go ok). These useful eeproms use a simple I2C connection and are easy to setup and use. Using an LCD with the Keypad. Instead of interpreting your data byte-by-byte,. Why do you need it to be sent as a string? Just send a byte value and treat it as so in the Arduino. PROGMEM is an abstraction, albeit not the best way to do this; but it has rooted itself into Arduino and pretty much became the way to do this if you want to write standard Arduino code. Arduino Float to String. And "char" is just an 8-bit integer. //1:r Arduino (2/4) In the previous tutorial we build the Arduino circuit and add the Arduino sketch to test our wiring. This yields a range of -2,147,483,648 to. Add the following at the top of your program:. The second line will convert the number to another temporary object, which allocates 5 bytes. I'm new to RP3, but fairly comfortable with Arduino. Processing Forum Recent Topics. Arduino - Passing Arrays to Functions - To pass an array argument to a function, specify the name of the array without any brackets. Tom Igoe (Physical Computing) has good examples on how to send bytes, but I don't remember if that was a whole lot of bytes or not. This sketch is compiled to 1,082 bytes of code using avr-gcc which bundled with Arduino v1. Arduino makes it pretty easy to store & use character strings, but those strings compete with your variables, so you can’t do as much. PROGMEM is a Arduino AVR feature that has been ported to ESP8266 to ensure compatability with existing Arduino libraries, as well as, saving RAM. The Arduino then sends the data string to the Pi. A char array is a byte arrray. Maybe my mistake is somewhere else. The DS3231 uses the I2C (Arduino 'Wire' library) interface and, by default is set to the fixed address 0x68. Converting to a C++ String object is another story. DIY Retro Look FM Radio with TEA5767 Module Project tutorial by Mirko Pavleski. On previous tutorials on our website, we have covered the use of several displays, LCDs, and TFTs, with diverse Arduino boards. Corrections, suggestions, and new documentation should be posted to the Forum. All Forums. There is no problem with receiving a 2-byte Arduino integer as a 4-byte integer in Processing as long as Processing expects to get only two bytes. One problem with compiling C/C++ code is that to change a constant in a program requires re-compilation and this takes time. String pieces[numberOfPieces] is now String pieces[4]) -I also changed the pieces String array to a long array and called toInt() on the substring. Since it is just a piece of the message it is difficult to understand the byte order (big or little endian). Writers of embedded software often define these types, because systems can sometimes define int to be 8 bits, 16 bits or 32 bits long. I don't know how to send one byte as a signal to Arduino so I can turn the LED on from. Here I post seperately the code for ARDUINO and the code for Processing:. Printline(buffer[i], HEX) has two parameters, the element of the byte array, and a enumerated value to indicate it is to be printed in Hexadecimal. parseInt() is looking for strings of numbers and interpreting them. Bytes objects are immutable sequences of single bytes [1] in the range between o and 255 (inclusive) [2]. If you need to represent a value >255 then you can send it over multiple bytes and concatenate into e. String pieces[numberOfPieces] is now String pieces[4]) -I also changed the pieces String array to a long array and called toInt() on the substring. These useful eeproms use a simple I2C connection and are easy to setup and use. {while(listenforcommand())//loop while messages are still in the queue. toCharArray() Reference Home. The Arduino I²C bus can be accessed using the Arduino Wire As such sending or receiving a single byte data like a character or a stream of bytes like a string is very simple as shown by the. One problem with compiling C/C++ code is that to change a constant in a program requires re-compilation and this takes time. cc's String page, and see Majenko's The Evils of Arduino Strings page. Basically String type variable in arduino is character array, Conversion of string to character array can be done using simple toCharArray() function. None Example See also. From Nokia 5110 LCD display to different types of OLEDs, the reason for the tutorials has been to ensure that, as a reader, you know how to use many of the most popular displays so this help you make the best choice when trying to select the perfect display for your. I2C is used with microcontrollers like the Arduino and with microcomputers like the Raspberry Pi. r/arduino: A place for all things Arduino! Am I missing something? A quick search of the standard Atmel AVR library that underlies Arduino has a function called strtoul() which will take a string of digits, and given that string, and the number base of the string represented, will automatically convert it to an unsigned long for you. To complete this project, we created a Framework,. Arduino - Passing Arrays to Functions - To pass an array argument to a function, specify the name of the array without any brackets. Blinking An LED. To refer to a particular location or element in the array, we specify the name of. Corrections, suggestions, and new documentation should be posted to the Forum. 0 License. To receive data from Arduino, in Android application we need to use threads. to send out through another method Here is my code it is not working the way th. Here I post seperately the code for ARDUINO and the code for Processing:. Convert numeric variable for eg. Storing strings in EEPROM, byte by careful byte. This data is sent as a byte or series of bytes; to send the characters representing the digits of a number use the print() function instead. Strings, which are arrays of characters, are used to store text in programs. Could you show me an example of how to send a string array from labview to the arduino? I want to make the string array a constant within the arduino. The only difference between the former and the latter is that a string is also an array of char variables but terminated by the null character '\0'. The bootloader is typically 2KB or less, leaving about 30KB for your compiled program. On the main window activity we add a new element TextView, which will be used to display the received data from the Arduino. One problem with compiling C/C++ code is that to change a constant in a program requires re-compilation and this takes time. Serial monitor is connected to the Arduino through serial communication. Unfortunately, my hashes were off. Why do you need it to be sent as a string? Just send a byte value and treat it as so in the Arduino. open function. The "active" length can be established by a call to the strlen function. Data comes in as a pointer byte (?) (like byte*) and I can easily convert it into a const. ) Last, if the strings are all the same length, don't store as strings and you'll save 100 char locations just used to hold the trailing zero of each string. A simple but beautifully accurate PWM frequency meter. Apart from that, I'm not sure about how well it works to send a bunch of bytes with serial. In this example, the Arduino reads a serial input string until it sees a newline, then converts the string to a number if the characters are digits. Coderwall Ruby Python JavaScript Front-End Tools iOS. //It will allow you to control up to 4 Atlas Scientific devices through 1 serial RX/TX line. The SRAM usage does not include SRAM used by local variables. You might ask how would you know the length of a string you are reading, for this I would save the length of a string also to the EEPROM in a set location then read that location first before reading the string its self. The Arduino String, which lets us use a string object in a sketch. Binaryhexconverter is a handy set of online binary converter tools including binary, decimal, hexadecimal, ascii text and octal base calculator. I've been using webclient. The serialPort1. Internally, it’s represented as an array of characters. String length and offsets are measured in bytes or wchar_t, not in "characters", which can be confusing to beginning programmers. The int size varies from board to board. It returns either one of the three following codes:. -Arduino doesnt allow declarations of arrays with variables for the length (i. Basically String type variable in arduino is character array, Conversion of string to character array can be done using simple toCharArray() function. Strings, which are arrays of characters, are used to store text in programs. Be sure to add the library call, and the variable declarations to the top of your sketch (don't forget to make your VirtuabotixPacket structure support 4 byte messages, or change this sketch to only populate 3 bytes and a null character on byte 4 instead of 5). That long string of code tells the compiler to keep a string inside of PROGMEM and not allow it to consume RAM. How it works. DIY Retro Look FM Radio with TEA5767 Module Project tutorial by Mirko Pavleski. 3V on the Arduino and GND pin to ground. Active 2 years, 3 months ago. Arduino makes it pretty easy to store & use character strings, but those strings compete with your variables, so you can't do as much. One problem with compiling C/C++ code is that to change a constant in a program requires re-compilation and this takes time. getBytes() Parameters. read() and Serial. Not a lot bigger, but it IS bigger. Overview of Strings in C. It includes tutorials, advice, and recommendations of particular interest to blind people working with electronics and microprocessors. available() and Serial. This is problomatic as the arduino serial buffer is restricted to 64 bytes, which in terms of text ain't even a tweet. r/arduino: A place for all things Arduino! In the original, the call to serial. Welcome, Aron here! In the last year I worked in a Line Follower Robot with Android and Arduino, or the project Timótheo. Arduino Convert Long to Char Array and Back I wanted to log data from an Arduino to an SD Card in the most space and time efficient manner possible. I am able to get data, but I'm having difficulty converting it into a string. Processing to Arduino (strings bigger than 64 bytes) Below is some code which allow you to send a large string form processing to arduino. So it can be like a needle in a haystack on large pages. To operate on the 4m (70 MHz) band, I run a transverter, which converts all RX and TX signals from 70 Mhz to 28 MHz. /* Serial Call and Response Language: Wiring/Arduino This program sends an ASCII A (byte of value 65) on startup and repeats that until it gets some data in. This example is good for debugging purposes when you don't know how long strings you are sending to arduino. Due to Wordpress's abysmal handling of code blocks this blog post is now hosted at https://majenko. Using an LCD with the Keypad. Typically a string is a null-terminated character array, which means an array of characters ending with a null character or zero. The IRQ pin is left unconnected as the Arduino library we are going to use doesn’t support it. String pieces[numberOfPieces] is now String pieces[4]) -I also changed the pieces String array to a long array and called toInt() on the substring. 17”; // the remote IP address int port = 8888; // the destination port. Maybe this is an easy one. Simple Android Bluetooth Application with Arduino Example Apr 23, 2016 By justin bauer This article will detail how to make a simple bluetooth application using Android Studio and demo it using an Arduino to toggle an LED and send data back-and-forth. toInt (); //Converts string to integer. I need a piece of two functions which, 1. com Arduino interfacing, circuits tutorials with code and ebooks, Step by step guides for all sensor modules used for arduino. My Arduino continuously sends room temperature readings as part of a text string and I wrote a VI to buffer the text, extract the temp digits, display the value and graph the data. I've attached my VI for your reference. Internally, it's represented as an array of characters. Avoiding string type variables is a good idea. I also want to be able to send the array back to the arduino. Simple Android Bluetooth Application with Arduino Example Apr 23, 2016 By justin bauer This article will detail how to make a simple bluetooth application using Android Studio and demo it using an Arduino to toggle an LED and send data back-and-forth. The NULL character terminates the string - or indicates the end of the string. String (capital S) is a memory destroyer and corrupter if certain functions are used in certain ways. Below is the code for the receiver. A String object can be created just like a variable and assigned a value or string. None Example See also. Once received into a buffer on the Arduino, these individual bytes need to …. Learn more on How Stuff Works: How Bits and Bytes Work and the Arduino Bit Math Tutorial to learn more about it. Each string. println("Hello"), uses 6 bytes of data space (the string “Hello” and the terminating 0). You will use something like this:. You don't need to worry about this now, but you might see this type of syntax in other pieces of Arduino sketches. Arduino, and the OutputStream is used for sending data to the Arduino. At start up, Arduino will send a string (a sentence) every 0. The Processing code beneath the Arduino code is commented out to avoid interference with the Arduino sketch. // Returns true if at least one byte (even only the string terminator one) is read. In other words, the Arduino will see the byte codes 50 and then 55 as per the ASCII table on this page. Each string. The other problem with this method is that it assumes you have an input string length divisible by 2, and you are not checking that (nor are your values passed in adhering to that). readString() : Serial monitor of Arduino is a very useful feature. I want to send a string array from the arduino to labview. String is basically character array terminated with null (0x00). It returns either one of the three following codes:. when using strings is a must, then it is important to keep them as short as possible - remember, each single char takes one byte of RAM (the entire 2KB RAM memory of an ATmega328p can be occupied by a string with a length of 2048 chars). I am trying to use pySerial to send a single byte from a Raspberry Pi 3 to an Arduino Mega 2560, like so: #RP3 python. It must be called before calling fileName and openFile functions. //It will allow you to control up to 4 Atlas Scientific devices through 1 serial RX/TX line. The ultimate goal is output my sensor readings via HTTP using the ethernet module. Arduino There are cases in which you might want to send parameters from Unity to Arduino. Find string length. All Forums. I created a method which reads a command from the Arduino Board's serial input buffer and writes it into the pointer which points to an Arduino-String - returned is an integer value indicating an operation success or an operation fail / warning. For a tutorial on how to encode content into base64 format, please check here. Silverlight talking to Arduino This is an initial rough post, but I have managed to get Silverlight 4 beta talking to an ActiveXperts COM+ interface that talks to an Arduino over a serial connection. Converts the byte array to an HEX string 2. Find this and other hardware projects on Hackster. From Nokia 5110 LCD display to different types of OLEDs, the reason for the tutorials has been to ensure that, as a reader, you know how to use many of the most popular displays so this help you make the best choice when trying to select the perfect display for your. However, the Arduino standard EEPROM library exposes only functionality for reading and writing a single byte, as described here. The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3. Arduino - Arrays - An array is a consecutive group of memory locations that are of the same type. arduino convert string to/from byte array. Six bytes might not seem much on a normal computer, but the ATmega328P chip only has. toInt (); //Converts string to integer. Writing a Byte Array to a Hexadecimal String I was finishing up work on a hashing library and started testing my hash values against other sources to ensure I was doing everything right. After that convert a char in the string to a half byte. The data can be displayed in the hyperterminal of the PC or in the arduino’s serial monitor itself. These useful eeproms use a simple I2C connection and are easy to setup and use. By popular demand (meaning somebody asked :), in this article I will show how I store ASCII characters(1) in an I2C EEPROM, and then how I fetch them for display purpose. Arduino Function Serial. It returns either one of the three following codes:. It includes tutorials, advice, and recommendations of particular interest to blind people working with electronics and microprocessors. You might ask how would you know the length of a string you are reading, for this I would save the length of a string also to the EEPROM in a set location then read that location first before reading the string its self. The Flash memory maximum size of 32,256 bytes is the Arduino Uno Flash memory size of 32,768 bytes, minus 0. Find anything that can be improved? Suggest corrections and new documentation via GitHub. Furthermore, if you start manipulating. When Serial data is transmitted to an Arduino, it is sent one byte at a time. UTF-8 and Shift JIS are often used in C byte strings, while UTF-16 is often used in C wide strings when wchar_t is 16 bits. Arduino Convert Long to Char Array and Back I wanted to log data from an Arduino to an SD Card in the most space and time efficient manner possible. Here are the functions you might use when receiving data. It does look like you are trying to convert a "hex" string input to byte data, but given the inputs I can't see how you can run this and not get an exception. Well the EEPROM. Its also gonnabe a very simple and basic Arduino tutorial but if you are new to Arduino then you must read it completely as it will gonna help you out. Arduino TEA5767 radio with analog meters for showing frequency and signal strength. Instead of interpreting your data byte-by-byte,. In order to get data from it I have to send data in the form of byte arrays. In this seventh installment of our articles on how to do Arduino Programming for beginners, we will take a look at working with text, or “strings”. The "String" class is sort of the beginner method of working with them and the "string" class is a char array. Here is arduino-serial. ) Last, if the strings are all the same length, don't store as strings and you'll save 100 char locations just used to hold the trailing zero of each string. On the main window activity we add a new element TextView, which will be used to display the received data from the Arduino. Then, we will simply echo each byte back to the client with the call to the write method, passing as input the byte to send. Make a program for Arduino. com Arduino interfacing, circuits tutorials with code and ebooks, Step by step guides for all sensor modules used for arduino. But the reading is done one byte at a time, and it reads the entire thing. As a practical example, I show how various types of data (byte, integer and string) can be stored and read in the EEPROM. I am able to get data, but I'm having difficulty converting it into a string. This project demonstrates a simple program which can be used to send a string to the serial port of the PC. Processing Forum Recent Topics. The other problem with this method is that it assumes you have an input string length divisible by 2, and you are not checking that (nor are your values passed in adhering to that). I need a piece of two functions which, 1. Converting to a C++ String object is another story. {while(listenforcommand())//loop while messages are still in the queue. To send characters over serial from your computer to the Arduino just open the serial monitor and type something in the field next to the Send button. You may think “A is for Apple”, but to a computer, an “A” is just the number 65. read() Returns the first byte from the serial buffer. (The tradeoff is you need an additional 100 pointer locations minus the max string length differences. Usually used for reading/writing single characters. Since Arduino Mega has 10bit ADC we will split every sample to 2 bytes //First byte will contain 3 most significant bits and second byte will contain 7 least significat bits. PROGMEM is a Arduino AVR feature that has been ported to ESP8266 to ensure compatability with existing Arduino libraries, as well as, saving RAM. The Blind Arduino Blog is a collection of news and information about blind makers working with Arduino. Then you can convert. We will study the Arduino UNO board because it is the most popular board in the Arduino board family. bought an arduino starterkit and started playing once I got the LCD working, I combined it with the temp sensor and created a simple thermostat. What is a buffer of bytes? Think of buffer as just another word for an array, list, whatever resonates with your programming experience. an instance of the String. Arduino makes it pretty easy to store & use character strings, but those strings compete with your variables, so you can’t do as much. This is an example of a method for an object of the String class. next() returns true while there are files in the directory to iterate over. This yields a range of -2,147,483,648 to. I am able to send the command and read the ACK. GitHub Gist: instantly share code, notes, and snippets. This might seem like a simple task, but when you send a number like 27 to the Arduino, it does not receive the number 27. Eeprom Page Write (Writing long strings to 24LC256) The Microchip 24LC256 eeprom and variants thereof are used in many projects for the storage of data when the microcontroller in use either doesn't have any eeprom memory or not enough.