It's not 10 (0x0A) but 16 (0x10) if you want to print the hexadecimal text representation.
byte x = 0x00;
byte y = 0x15;
if ( x <0x10)
{
Serial.print("0");
}
Serial.println(x);
if ( y <0x10)
{
Serial.print("0");
}
Serial.println(y); Answer from sterretje on forum.arduino.cc
Arduino Forum
forum.arduino.cc › projects › programming
How to print the leading zero of HEX - Programming - Arduino Forum
January 10, 2021 - I'm a beginner, I have this script to send and receive Hex from a hardware device. The reply that I've receive is in Hex but doesn't print the leading zero. For example it should print E2 00 00 16 60 10 02 27 18 20 5A 76 but it just printed E2 0 0 16 60 10 2 27 18 20 5A 76 Can someone help me?Thanks #include "Arduino.h" //#define DEBUG unsigned char incomingByte; void sendIdentifyCmd () { Serial1.write (0xbb); Serial1.write (0x00); Serial1.write (0x22); Serial1.write (0x00); ...
Arduino Forum
forum.arduino.cc › forum 2005-2010 (read only) › software › development
Print hex with leading zeroes - Development - Arduino Forum
July 19, 2010 - You can print hex using the serial library with Serial.print(data,HEX), but it does not include leading zeroes, so 0x01 will come out as 1, etc. This can get confusing if you print an array, so I put together some simple functions to include leading zeroes. In case they are useful to others, here they are: /* PrintHex routines for Arduino: to print byte or word data in hex with leading zeroes.
Add leading zeros to HEX string
Hello! I am new to Arduino and, in my project, I'm trying to print via Serial some hexadecimal strings (these strings are stored in some uint32_t variabiles) with Serial.print(hex_string, HEX), but unfortunately, whenev… More on forum.arduino.cc
13
0
July 5, 2020c++ - Printing long value to hex with leading zeroes - Stack Overflow
I've been using this function to print int values with leading zeroes with 4 decimals, which has been working well. More on stackoverflow.com
Adding leading zeros to HEX
Hi I want to add the initial 0 to make sure all values are 2 characters long for a mac address, (not the 0x part) Any suggestions of how it work here? String dataString = ""; dataString += String(mac… More on forum.arduino.cc
9
0
July 17, 2012Serial.print as HEX should ALWAYS print 2 chars per byte; it omits leading zeroes [imported]
One could assemble the bytes into ... who use the HEX format would like to see all their nibble values with any size data. The examples in the Arduino reference sidestep the issue by not showing any example with a leading zero ;-) http://arduino.cc/en/Serial/Print... More on github.com
11
November 15, 2012Reddit
reddit.com › r/arduino › need help - how do i serial.write a hex value including the leading zeroes?
r/arduino on Reddit: Need help - How do I Serial.write a hex value INCLUDING the leading zeroes?
September 19, 2016 - Is there any way I can trick the Arduino to do a Serial.write() in these formats? Thanks a lot! ... Serial.write outputs the binary value, so 0x7E outputs 01111110. ... It's at the office, so not until tomorrow. I should have mentioned I was using the format Serial.write(0x7E), which writes the byte in the correct format, but Serial.write(byte) (where byte is the value in hex format) only writes 7E, not 0x7E.
GitHub
github.com › arduino › Arduino › pull › 6750
Added support for HEX leading zero in print by Tijgerd · Pull Request #6750 · arduino/Arduino
I added a OPTIONAL input value which defaults to PRINT_NOARG when not assigned. if it IS assigned it checks if the given HEX value is smaller than 16, if so, it will add a leading zero. With this solution, old scripts can still be used :) I think that's the whole point..
Author arduino
Arduino Forum
forum.arduino.cc › projects › programming
Add leading zeros to HEX string - Programming - Arduino Forum
July 5, 2020 - Hello! I am new to Arduino and, in my project, I'm trying to print via Serial some hexadecimal strings (these strings are stored in some uint32_t variabiles) with Serial.print(hex_string, HEX), but unfortunately, whenev…
Arduino Forum
forum.arduino.cc › projects › programming
Adding leading zeros to HEX - Programming - Arduino Forum
July 17, 2012 - Hi I want to add the initial 0 to make sure all values are 2 characters long for a mac address, (not the 0x part) Any suggestions of how it work here? String dataString = ""; dataString += String(mac[0], HEX); dataString += ":"; dataString += String(mac[1], HEX); dataString += ":"; dataString += String(mac[2], HEX); dataString += ":"; dataString += String(mac[3], HEX); ...
GitHub
github.com › arduino › ArduinoCore-API › issues › 40
Serial.print as HEX should ALWAYS print 2 chars per byte; it omits leading zeroes [imported] · Issue #40 · arduino/ArduinoCore-API
November 15, 2012 - What steps will reproduce the problem? 1.If byte or integer variables are printed with serial.print or serial.println with the HEX output format option leading zeroes are not printed: byte reading5 = 0x0F; byte reading6 = 0x00; byte reading7 = 0xF0; .............
Author arduino
Top answer 1 of 2
1
String(mfrc522.uid.uidByte[i], HEX) means you want to convert number into hexadecimal string repesentation, if you pass 4 as input parameter, it will convert it into "4", not "04". You need to apply similar approach as you have used when printing the value through UART. For example:
if (String(mfrc522.uid.uidByte[i] < 0x10)
inStringHex += " ";
inStringHex += String(mfrc522.uid.uidByte[i], HEX);
Personally, I would recommend switching from Strings into static buffers (because arduino has too small memory to use dynamic allocation and there could be issue with running out of memory due to memory fragmentation):
char id[16];
sprintf(id, "%02x%02x%02x%02x", mfrc522.uid.uidByte[0], mfrc522.uid.uidByte[1], mfrc522.uid.uidByte[2], mfrc522.uid.uidByte[3]);
2 of 2
1
you can try ;
for (byte i=0; i < uidLength; i++)
{
Serial.print(uid[i] < 0x10 ? " 0" : "");
Serial.print(uid[i], HEX);
if (uid[i] < 0x10) inStringHex += "0";
inStringHex += String(uid[i], HEX);
} Serial.println(); Serial.println(inStringHex);
Phanderson
phanderson.com › arduino › arduino_display.html
Display Routines - Arduino - Peter H. Anderson
For example; x = 3; Serial.print(x, BIN); Serial.print(x, HEX); will print; 11 F · PRINT_BINARY, PRINT_HEX. In these routines, the number of places may be specified. For example; x = 15; print_binary(x, 8); print_hex(x, 8); will print; 0000_1111 0F · // PRINT_BINARY - Arduino // // Prints ...
Top answer 1 of 6
10
Simple brute force method, is to write a routine as:
void p(char X) {
if (X < 16) {Serial.print("0");}
Serial.println(X, HEX);
}
And in the main code:
p(byte1); // etc.
2 of 6
6
The lowest footprint in Memory, Code and runtime would be classic bit playing
byte b;
Serial.print(b>>4, HEX);
Serial.print(b&0x0F,HEX);
Which is working fine on any 8bit type. For any other mask also the first line to
Serial.print((b>>4)&0x0F, HEX);
Arduino Forum
forum.arduino.cc › projects › programming
[Solved] How to supress leading zero trimming with serial.print(var, HEX); - Programming - Arduino Forum
April 23, 2014 - I'm advising him with one method ... to use serial.print(var, HEX); to send a byte of data encoded as two ASCII characters. Unfortunately, I'm noticing that if the high nybble of the byte of data is zero then the print method will strip the ...
Teensy Forum
forum.pjrc.com › home › forums › main category › technical support & questions
Serial print leading zeroes | Teensy Forum
May 19, 2017 - I'm wanting to print several bytes consecutively (Bytes 1 to 8), and leading zeros would help me visually parse the string. ... For that I use Serial.printf. Example: Serial.printf("x", Byte1); Will print 8 characters wide with 0s filling... ... Another couple of examples to work from ...
Arduino Forum
forum.arduino.cc › projects › programming
'Print hex with leading zeroes' by Arduino, skips first value? - Programming - Arduino Forum
December 31, 2021 - I'm testing the 'Print hex with leading zeroes' solution found here (Print hex with leading zeroes). But as shown, this code does not format the first number of the data. So this '0x00, 0x5A, 0x58, 0x00, 0x07, 0x00, 0x…
Edaboard
edaboard.com › digital design and embedded programming › microcontrollers
Saving Leading Zero HEX into String Arduino | Forum for Electronics
April 22, 2018 - "0" : ""); Serial.print(mfrc522.uid.uidByte[i], HEX); inStringHex += String(mfrc522.uid.uidByte[i], HEX); } Serial.println(); Serial.println(F("Hex normal")); Serial.print(inStringHex); Serial.println(); Serial.println(); inStringHex = ""; delay(5000); } } Here is the result in Serial monitor: https://imgur.com/a/0mbxlDH What i want is the String under "Hex normal" would be "04292e5a" not "4292e5a" Thank You.
Arduino Forum
forum.arduino.cc › projects › programming
Store HEX with the leading zero - Programming - Arduino Forum
February 3, 2023 - Hi everyone. is there a way to store HEX with the leading zero ? (i need 0x49, not 49 only). i also need them to be able to be converted to uint8 so i can't do strings. Any idea ?
Arduino Forum
forum.arduino.cc › community › suggestions for the arduino project
Support for leading zeros in Serial.print, etc. - Suggestions for the Arduino Project - Arduino Forum
July 5, 2015 - They end up writing code like this: · Serial.print(hh, DEC); // show hours Serial.print(":"); // colon Serial.print(mm, DEC, 2); // show minutes (two figures) Serial.print(":"); // colon Serial.print(ss, DEC, ...
Blogger
anilarduino.blogspot.com › 2015 › 05 › converting-decimal-to-hex-values-in.html
My Tinkering With Arduino: converting Decimal to HEX values in Arduino
while i am searching for a way to send the HEX values rather than Int / char values using Arduino Serial communication. i find that Serial.print() will do the work for me. void setup(){ int a = 17; Serial.begin(9600); Serial.print("value of a :"); Serial.println(a); Serial.print("HEX equalent of a :"); Serial.println(a,HEX); } void loop(){ //do nothing } and the output is like it is good enough to do the work for me But there is a chance of error if i wanted to send a value in the middle of array. the problem arise when we wanted to print leading zeros for fixed two byte and 4 byte HEX values if we wanted to print values 1 and 1000,we get hex equivalents as which is printed by omitting zero's.
Arduino Forum
forum.arduino.cc › projects › programming
Adding a leading 0 to incoming HEX data for conversion to binary - Programming - Arduino Forum
October 6, 2017 - Hello again! I am still working on my CAN-Bus project (btw I will of course post the finished code if anyone is interested) from this Link here. As maybe the whole problem is just too much to ask for here is a little sub-question: The CAN-Message I receive is in Hex.
Arduino Forum
forum.arduino.cc › projects › programming
Serial.print(Value,HEX); - Programming - Arduino Forum
June 9, 2017 - I wanted to test the serial.print(value,HEX) function to make sure, that the output from the routine always are 2 chars long ( eg: 0x00 --> 00 and 0xFF --> FF) · Is there an option in this ser.prnt(Value,HEX) command so I can force 2 digits ...