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Last Revision: 2019/05/19

Last Build: 2024/11/08

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Reference > Language > Functions > Bits and bytes > Bitwrite

bitWrite()

[Bits and Bytes]

Description

Writes a bit of a numeric variable.

Syntax

bitWrite(x, n, b)

Parameters

x: the numeric variable to which to write.
n: which bit of the number to write, starting at 0 for the least-significant (rightmost) bit.
b: the value to write to the bit (0 or 1).

Returns

Nothing

Example Code

Demonstrates the use of bitWrite by printing the value of a variable to the Serial Monitor before and after the use of bitWrite().

void setup() {
  Serial.begin(9600);
  while (!Serial) {}  // wait for serial port to connect. Needed for native USB port only
  byte x = 0b10000000;  // the 0b prefix indicates a binary constant
  Serial.println(x, BIN); // 10000000
  bitWrite(x, 0, 1);  // write 1 to the least significant bit of x
  Serial.println(x, BIN); // 10000001
}

void loop() {}

See also