IdigitalRead()

IdigitalRead()

IdigitalRead() reads the input several times consecutively and updates the state only when all values match. If HIGH and LOW are mixed, it retains the previous stable state.

bool IdigitalRead(uint8_t pin, uint8_t samples)

Commands

Command	Arguments	Return Value	Operation
`IdigitalRead(pin, samples)`	`uint8_t pin` — Digital input pin number `uint8_t samples` — Consecutive read count. Values of `1` or less read once; supports up to `255` reads	`bool`	Reads the input several times consecutively and updates the state only when all values match. If HIGH and LOW are mixed, it retains the previous stable state.

How It Works

Read the input samples times consecutively.
If all readings are HIGH, update the stable state to HIGH.
If all readings are LOW, update the stable state to LOW.
If HIGH and LOW are mixed, treat this as brief noise and retain the previous stable state.
If no previous stable state exists and the readings are mixed, return LOW.

Example

This example reads MPAINO-8A8R(T) input 0 and displays the result on output 64.

void setup() {}
 
void loop() {
  bool input = IdigitalRead(0, 5);  // Read the input repeatedly and update only if all samples match. If HIGH and LOW are mixed, retain the previous stable state.
 
  if (input) {
    digitalWrite(64, HIGH);
  } else {
    digitalWrite(64, LOW);
  }
}

Precautions

If samples is 1 or less, the input is read only once.
A larger samples value increases the time taken by each call. 3 or 5 reads are recommended for typical input noise checks.
This command reads several times immediately. Use Ibounce() to remove ms-scale chatter such as mechanical switch bounce.

Built-in Commands in the Same Category

← Built-in Command List