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Questions tagged [bit]

A bit (short for binary digit) is the smallest unit of data in a computer. A bit has a single binary value, either 0 or 1. Although computers usually provide instructions that can test and manipulate bits, they generally are designed to store data and execute instructions in bit multiples called bytes.

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Control 4 digital outputs with one switch

I want to control 4 digital outputs (d0, d1, d2, d3) with one switch. When the Arduino starts, they should all be in state LOW. Now, after pressing the button once, d0 should get HIGH. Another push ...
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70 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, ...
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25 views

Bit Number to Byte Value conversion (AVR Docs)

I have hard time to understand what this doc tells me: https://www.microchip.com/webdoc/AVRLibcReferenceManual/FAQ_1faq_use_bv.html I has a macro called _BV that convert a bit number (usually ...
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MXCHIP IoT DevKit too many initializers for 'unsigned char [0]

Question Trying to call the Display draw API using the sample code for the azure logo bitmap sample code. I'm unable to reach a point where I can the API because breaks when constructing the bitmap ...
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2answers
81 views

Replace digitalWrite with a selective bitwise operation

I have the following code with digitalWrite I aim to write with bitwise operation only. No portability concerns here whatsoever. (for atmega328p here) #define DATAOUT 11//MOSI byte commandbits = ...
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176 views

Testing Conditions on Port Bytes - ignoring certain bits?

Being new to testing byte and bit conditions, I feel like there has to be a better way to test for conditions/values on a byte (read from a port). For example, I'm reading 8 bits from PORTK. I need ...
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4answers
2k views

Hex/Byte Reversing and Conversion

I'm working on an RFID system using a MFRC522 with this Library : https://github.com/miguelbalboa/rfid Here's the code I have right now: int A=(mfrc522.uid.uidByte[0]); int B=(mfrc522.uid.uidByte[1]);...
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516 views

transmit a sequence of bit using arduino uno [closed]

How do i code to transmit a sequence of bit using arduino uno?My project is about a transmitter and a receiver.Arduino as the transmitter and an application as the receiver.Light sensor will detect ...
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2answers
671 views

C++ Adding Two 16 bit binary numbers together

I am trying to add two 16 digit binary numbers together. Each binary number will have been entered by the user and saved as: int binaryOne[16] and int binaryTwo[16]. Originally, int binaryOne[16] = {...
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3answers
81 views

Arduino status of bit

Is the a way to check the status of a bit in an arduino Uno? Like how in Atmel AVR, there is bit_is_clear or bit_is_set
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282 views

How does Arduino UNO deal with bit shifting?

Explanatory comment: I'm a beginner. I'm examining the feasibly of bit shifting to the right 6 places to divide up the range of the Arduino ADC (has a range of 0 to 1023) to something much smaller. ...
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194 views

Encode & decode boolean values into a single integer?

I'm trying to record the state of some pins over time. To save memory, I'm thinking about encoding the pin states into a single integer, like this: Pin 1: TRUE Pin 2: FALSE Pin 3: FALSE Pin 4: TRUE ...
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157 views

Understanding bitwise operations [duplicate]

I am wondering what the second line of code does: int16_t GyX; GyX=Wire.read()<<8|Wire.read(); Also, how can I write the GyX value to EEPROM? From what I understand, int16_t is a two-bytes ...
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Overflow in bit calculation [closed]

I'm having a double buffer to write data from sensors to SD card. inBuf points to the buffer that are written into (from sensors). The other buffer write data to SD card. char buffer[2][BUFLEN]; ...