countio – Support for edge counting

The countio module contains logic to read and count edge transistions

All classes change hardware state and should be deinitialized when they are no longer needed if the program continues after use. To do so, either call deinit() or use a context manager. See Lifetime and ContextManagers for more info.

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class countio.Edge

Enumerates which signal transitions can be counted.

Enum-like class to define which signal transitions to count.

RISE :Edge

Count the rising edges.

FALL :Edge

Count the falling edges.

RISE_AND_FALL :Edge

Count the rising and falling edges.

class countio.Counter(pin: microcontroller.Pin, *, edge: Edge = Edge.FALL, pull: Optional[digitalio.Pull])

Count the number of rising- and/or falling-edge transitions on a given pin.

Create a Counter object associated with the given pin that counts rising- and/or falling-edge transitions. At least one of rise and fall must be True. The default is to count only falling edges, and is for historical backward compatibility.

Parameters
  • pin (Pin) – pin to monitor

  • Edge – which edge transitions to count

  • digitalio.Pull – enable a pull-up or pull-down if not None

For example:

import board
import countio

# Count rising edges only.
pin_counter = countio.Counter(board.D1, edge=Edge.RISE)
# Reset the count after 100 counts.
while True:
    if pin_counter.count >= 100:
        pin_counter.reset()
    print(pin_counter.count)
count :int

The current count in terms of pulses.

deinit(self) None

Deinitializes the Counter and releases any hardware resources for reuse.

__enter__(self) Counter

No-op used by Context Managers.

__exit__(self) None

Automatically deinitializes the hardware when exiting a context. See Lifetime and ContextManagers for more info.

reset(self) None

Resets the count back to 0.