6
votes
Printing the array using print and serial write function in Arduino Uno
Serial.write(some_byte) writes a byte on the serial output. The
Arduino serial monitor tries to interpret the bytes it receives as text:
0x11 is a control character, displayed as “□”
0x22 is the ...
- 44.3k
4
votes
Accepted
SyslogAppender for log4esp
Class Print is a base class of Arduino streaming. Stream is a derived class and adds reading capability. Print has only one abstract method write to write one byte to output or buffer. It is easy to ...
- 18.2k
3
votes
Construct Strings with UTF-8 characters from data
As you have noticed, Serial doesn't know how to deal with wchar_t.
If you are building your strings algorithmically from Unicode code
points, you need to convert those code points to UTF-8 for ...
- 44.3k
3
votes
Accepted
Int64_t aka long long acts as int32_t and overflows at 2^31
1 << 31 is interpreted by the compiler as (int)1 << (int)32.
See the implicit types of integer literals. The
rules of usual arithmetic conversions state that no implicit conversion
is ...
- 44.3k
3
votes
Accepted
Why can't I print boolean variable values (0 and 1) through println function?
First, you are not supposed to use boolean with digitalRead.
The function prototype in Arduino.h is:
int digitalRead(uint8_t);
Thus, the correct data type for buttonState in your code is int. Then ...
- 38.7k
3
votes
Accepted
how can I send a variable to println?
Change:
SIM900.println("AT+CMGS=\"591"numero"\"");
to
SIM900.print("AT+CMGS=\"591");
SIM900.print(numero);
SIM900.println("\"");
Note that only the final call is to println() (which just prints a ...
- 6,974
3
votes
Serial.print and char[] & null
The "Serial" is a object/class and that makes it possible to have more than one function for Serial.print(). According to the type of the parameter the proper Serial.print() is selected.
This is the ...
- 3,246
3
votes
How can I get Serial.print to print a variable thats a char?
To make your code work, you must use character array pointers. A "char" holds only one character, while "char*" can point to a string.
char foo = 'a';
char *bar = "string with lots of stuff.";
So ...
- 51
2
votes
Help understanding Print::write()--it calls write()--where is write() defined? Help reading code
In the Print class the virtual size_t write (uint8_t)=0 DEFINES and names a function that accepts a byte and returns a size. ANY "virtual" function in a base class CAN be over-ridden in a derived ...
- 21
2
votes
Accepted
Help understanding Print::write()--it calls write()--where is write() defined? Help reading code
write is implemented in the class that inherits the Print class - such as HardwareSerial.
There are a number of write functions, and they are overloaded, which means that they are all distinct ...
- 106k
2
votes
Accepted
Serial.print and char[] & null
When passing a char* you need to also pass some way of telling the function where it ends. In C that is usually the null terminator and that's all a null terminator is for. If that is missing then you ...
- 3,267
2
votes
Accepted
Serial Monitor is printing out weird values and skipping strings
int checkSum[] = {-1, -1};
const String stringPool[] = {
"Satz 1", "Satz 2", "Satz 3", "Satz 4",
"Satz 5", "Satz 6", "Satz 7", "Satz 8",
...
- 1,045
2
votes
Accepted
Need HELP!! Serial communication has a very "Strange Problem"
Why it does not work? You already got the answer in comments:
You are reading more bytes from the serial stream than what you know
are available. Then, your length variable can contain garbage, which
...
- 44.3k
1
vote
How to read and Serial.print the contents (current values) of an 8-bit register?
Another option:
#include <LibPrintf.h>
printf("%.8b", ADMUX); //prints: 0110000
The LibPrintf.h library is standard included on ESP boards.
%b stands for binary. .8 for 8 decimal ...
- 55
1
vote
Printing the array using print and serial write function in Arduino Uno
To store a 2 character string you need a 3 byte array, not a 2 byte array. This is because in C a string consists of the actual string data and a zero ("NULL") byte at the end to indicate ...
- 106k
1
vote
Accepted
Arduino Serial.readString() trouble
You need to use Serial.readStringUntil('\n') instead of Serial.readString if you use the Arduino IDE's serial monitor (where a \n is added as termination character when you press enter).
Also remove ...
- 1,869
1
vote
Printing vairable with U8GLib
I do not understand, how you initialize the DHT sensor object.
(I wonder why this compiles at all.)
Your way:
//dht11 kodu için ayarlamalar
#include <dht.h>
dht DHT;
#define DHT11_PIN 7
I would ...
- 1,893
1
vote
Accepted
Trying to do hello world app for Nokia 5110 LCD with arduino yun and johnny five
Arduino Yun is a ATMega32U4-based board, like other ATMega32U4-based Arduino boards, such as Arduino Leonardo, Micro, the SPI is only available on the ICSP header:
MOSI - Yun has it on ICSP Pin 4
...
- 1,549
1
vote
Serial Moniror, '\r' and Realterm
\r returns the cursor to the start of the current line. You can't use it to go back up to previous lines.
Instead you need to learn ANSI escape sequences to move the cursor around.
For example ...
- 106k
1
vote
Displaying characters as bitmaps
I would split it down into functions.
First write a function which takes a character and a pair of coordinates, then draws the bitmap corresponding to that character at the given coordinates on the ...
- 106k
1
vote
Accepted
How to print/display next menu item with menubackend.h?
You have a global variable menu, which is of type MenuBackend, which contains the structure of your menu system. One of the member functions of MenuBackend is MenuItem getCurrent(), which returns a ...
- 6,974
1
vote
DHT 11 sensors and i2c LCD to Wemos Wifi not Working
Constant D14 is for Wemos D1 and other esp8266 dev boards mapped in arduino core to esp8266 io pin 4. Pin 4 is used as I2C SDA pin. The LCD uses I2C so pin 4 (D14) can't be used for the sensor.
from ...
- 18.2k
1
vote
U8glib funny problem
Your void_Menu_draw_test_man() function checks menu_redraw_required
Does your other part of the program update that variable? Do you call void_Menu_draw_test_man() from the loop() function?
It may ...
- 6,974
1
vote
Use Print library to set string variable
You can get all the functionality of Print by creating your own class
that inherits from it. For this, you only need to implement the
size_t write(uint8_t) method that prints a single character. Here ...
- 44.3k
Only top scored, non community-wiki answers of a minimum length are eligible