Questions tagged [bytes]
A group of binary digits or bits (usually eight) operated on as a unit.
18 questions
-1
votes
2
answers
473
views
How 2 bytes can produce negative number, mind blowing?
I am trying to use LoRAWAN and sending tempurature values as less bytes. I found that way and tested it works fine it can send negative and positive numbers as 2 bytes instead of "float" as ...
- 297
-1
votes
1
answer
88
views
How to get recover numeric data sent by an Arduino in binary
I am a C# dev and these C++ data conversions are killing me.
I have an Arduino sending binary data through LoRaWAN to AzureIOT. I am trying to decode my Temp/Humid/Bat payload that I am pulling out of ...
- 103
1
vote
1
answer
1k
views
Parse char* mac-string to uint8_t array
I have to handle a String coming in over UART containing a bunch of information, part of it is a MAC-address that I get by using String.substring(a, b) returning a 12-char String representing a mac-...
- 11
2
votes
0
answers
391
views
Modbus RS485 Decode the message received
I'm try to read some value from a soil NPK sensor using RS485 Modbus e Arduino uno.
I menage to sent the request msg and I got the response but now i don't know how to read the response in order to ...
- 151
3
votes
1
answer
3k
views
Changing single bit in byte array
So I have a byte-array representing the display attached to my Arduino:
byte theDisplay[8] = {
B00000000,
B00000000,
B00000000,
B00000000,
B00000000,
B00000000,
B00000000,
...
- 163
0
votes
1
answer
412
views
Pass Byte Array to Char and Send to a Separate Arduino
I am trying to send data between Arduino Nano and D1 Mini (ESP 8266 Module)
My Code as below in Nano which will be the transmeting ,
#include <DES.h>
#include <SoftwareSerial.h>
...
- 145
0
votes
2
answers
355
views
Arduino Serial Monitor Input 3DES Encryption
I am trying to 3DES encryption using Serial Read, Found this 3DES Sample code in Github,
#include <DES.h>
DES des;
void setup() {
Serial.begin(9600);
Serial.println("Hello!");
}
...
- 145
0
votes
2
answers
608
views
Why float and not 16-bit Integer? Mpu6050 with atmega328P
I've been trying to follow this example code for interfacing my atmega328P with Mpu6050:
https://www.instructables.com/Accelerometer-MPU-6050-Communication-With-AVR-MCU/
And was wondering a couple of ...
- 125
0
votes
2
answers
2k
views
Is there a variable type of half byte? Is there a workaround?
I have this long array of 64 values going from 0 to 15, values which only cost 8 bits, for a pulse width modulation.
So I made a test to see its cost in space, commenting one of the two arrays.
const ...
- 167
-1
votes
1
answer
1k
views
Reading Buffer from Software-Serial & Writing to Serial
My progress so far:
#include <SoftwareSerial.h>
SoftwareSerial ttySerial(10, 11); // RX, TX
byte buffer;
void setup()
{
// Open serial communications and wait for port to open:
Serial....
- 109
0
votes
1
answer
5k
views
RF24 library commands, channel, and address
I'm trying to use the RF24 library for wireless communication.
However, it appeared that this library does not have "help" option.
There was a keywords file but it did not explain what it does.
I ...
1
vote
3
answers
4k
views
Set and extract individual bytes of a number (lowByte() and highByte())
You can extract
the low-order (rightmost) byte of a variable
or
the high-order (leftmost) byte of a word
with the functions lowByte() and highByte() respectively (the quotes are from the Arduino ...
- 295
1
vote
2
answers
575
views
need to compare if a byte is less than 80 hex
I am using an infrared sensor called OTI301. In its data sheet it says that in order to obtain object temperature and ambient temperature values I need to extract the binary information from the ...
2
votes
2
answers
2k
views
How to convert char[12] to byte[6]
I am trying to convert a char[12] array that contains a Mac Address into a byte[6] in order to use within the Ethernet.begin method. I have tried various methods from online, but had little success to ...
- 33
1
vote
2
answers
626
views
How to modify a created byte?
I have created a byte for 16x2 LCD. It is basically a custom character which I will have to change later.
byte char[8]{
B10000,
B01000,
B00100,
B00010,
B00001,
B11000,
B11100
};
I want to edit ...
- 217
1
vote
1
answer
4k
views
USing arrays, binary data and bitRead
This is my first manually typed code. I'm sure there may be some glaring "schoolboy errors" in it, so wondered if people could give it the 'once over' In particular, I have never used C++ arrays, ...
- 11
0
votes
1
answer
130
views
Arduino will not read three successive packets in the serial connection
I have written a small program to send serial commands from Python to the Arduino Micro. This is my code for both:
Python
import serial
ser = serial.Serial('COM5', 9600)
ser.write(b'0')
ser.write(...
- 1
0
votes
1
answer
2k
views
Passing arrays, global arrays within functions, pointers, and declaring array sizes
I'm super confused right about now!
I've been working on project involving Xbees in API mode, and I need to send different arrays of bytes to the Xbee depending on which buttons I press. Mostly what ...
- 504