countio – Support for edge counting

The countio module contains logic to read and count edge transistions

For more information on the applications of counting edges, see this Learn Guide on sequential circuits.

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.

Available on these boards
  • 42. Keebs Frood
  • ARAMCON Badge 2019
  • ARAMCON2 Badge
  • ATMegaZero ESP32-S2
  • Adafruit CLUE nRF52840 Express
  • Adafruit Camera
  • Adafruit Circuit Playground Bluefruit
  • Adafruit Circuit Playground Express 4-H
  • Adafruit CircuitPlayground Express
  • Adafruit EdgeBadge
  • Adafruit Feather Bluefruit Sense
  • Adafruit Feather ESP32 V2
  • Adafruit Feather ESP32-S2 TFT
  • Adafruit Feather ESP32-S3 TFT
  • Adafruit Feather ESP32S2
  • Adafruit Feather ESP32S3 4MB Flash 2MB PSRAM
  • Adafruit Feather ESP32S3 No PSRAM
  • Adafruit Feather HUZZAH32
  • Adafruit Feather M4 CAN
  • Adafruit Feather M4 Express
  • Adafruit Feather RP2040
  • Adafruit Feather RP2040 Scorpio
  • Adafruit Feather nRF52840 Express
  • Adafruit FunHouse
  • Adafruit Grand Central M4 Express
  • Adafruit Hallowing M4 Express
  • Adafruit ItsyBitsy M4 Express
  • Adafruit ItsyBitsy RP2040
  • Adafruit ItsyBitsy nRF52840 Express
  • Adafruit KB2040
  • Adafruit LED Glasses Driver nRF52840
  • Adafruit Macropad RP2040
  • Adafruit MagTag
  • Adafruit Matrix Portal M4
  • Adafruit Metro ESP32S2
  • Adafruit Metro M4 Airlift Lite
  • Adafruit Metro M4 Express
  • Adafruit Metro nRF52840 Express
  • Adafruit Monster M4SK
  • Adafruit PyGamer
  • Adafruit PyPortal
  • Adafruit PyPortal Pynt
  • Adafruit PyPortal Titano
  • Adafruit Pybadge
  • Adafruit QT Py ESP32 PICO
  • Adafruit QT Py ESP32-S3 no psram
  • Adafruit QT Py ESP32S2
  • Adafruit QT Py RP2040
  • Adafruit QT2040 Trinkey
  • Adafruit Trellis M4 Express
  • AloriumTech Evo M51
  • Arduino Nano 33 BLE
  • Arduino Nano RP2040 Connect
  • Artisense Reference Design RD00
  • AtelierDuMaker nRF52840 Breakout
  • BBQ20KBD
  • BDMICRO VINA-D51
  • BLE-SS dev board Multi Sensor
  • BPI-Bit-S2
  • BPI-Leaf-S3
  • BPI-PicoW-S3
  • BastBLE
  • BastWiFi
  • Bee-Motion-S3
  • Bee-S3
  • BlueMicro840
  • CP32-M4
  • CRCibernetica IdeaBoard
  • Challenger NB RP2040 WiFi
  • Challenger RP2040 LTE
  • Challenger RP2040 LoRa
  • Challenger RP2040 SubGHz
  • Challenger RP2040 WiFi
  • Challenger RP2040 WiFi/BLE
  • Circuit Playground Express Digi-Key PyCon 2019
  • CircuitBrains Deluxe
  • CrumpS2
  • Cytron Maker Feather AIoT S3
  • Cytron Maker Nano RP2040
  • Cytron Maker Pi RP2040
  • DynOSSAT-EDU-OBC
  • ELECFREAKS PICO:ED
  • ESP 12k NodeMCU
  • ESP32-S2-DevKitC-1-N4
  • ESP32-S2-DevKitC-1-N4R2
  • ESP32-S2-DevKitC-1-N8R2
  • ESP32-S3-Box-2.5
  • ESP32-S3-Box-Lite
  • ESP32-S3-DevKitC-1-N8
  • ESP32-S3-DevKitC-1-N8R2
  • ESP32-S3-DevKitC-1-N8R8
  • ESP32-S3-DevKitM-1-N8
  • ESP32-S3-EYE
  • ESP32-S3-USB-OTG-N8
  • Electrolama minik
  • Electronut Labs Blip
  • Electronut Labs Papyr
  • EncoderPad RP2040
  • Espressif ESP32-EYE
  • Feather ESP32S2 without PSRAM
  • FeatherS2
  • FeatherS2 Neo
  • FeatherS2 PreRelease
  • FeatherS3
  • Fig Pi
  • Franzininho WIFI w/Wroom
  • Franzininho WIFI w/Wrover
  • Gravitech Cucumber M
  • Gravitech Cucumber MS
  • Gravitech Cucumber R
  • Gravitech Cucumber RS
  • HMI-DevKit-1.1
  • Hardkernel Odroid Go
  • HexKyS2
  • HiiBot BlueFi
  • IkigaiSense Vita nRF52840
  • IoTs2
  • Kaluga 1
  • LILYGO TTGO T8 ESP32-S2
  • LILYGO TTGO T8 ESP32-S2 w/Display
  • LOLIN S3 16MB Flash 8MB PSRAM
  • M5Stack Atom Lite
  • M5Stack Core Basic
  • M5Stack Core Fire
  • MDBT50Q-DB-40
  • MDBT50Q-RX Dongle
  • MORPHEANS MorphESP-240
  • Maker badge by Czech maker
  • MakerDiary nRF52840 MDK
  • MakerDiary nRF52840 MDK USB Dongle
  • Makerdiary M60 Keyboard
  • Makerdiary Pitaya Go
  • Makerdiary nRF52840 M.2 Developer Kit
  • Melopero Shake RP2040
  • MicroDev microS2
  • Mini SAM M4
  • MixGo CE
  • Oak Dev Tech BREAD2040
  • Oak Dev Tech Cast-Away RP2040
  • Oak Dev Tech PixelWing ESP32S2
  • Open Hardware Summit 2020 Badge
  • PCA10056 nRF52840-DK
  • PCA10059 nRF52840 Dongle
  • Particle Argon
  • Particle Boron
  • Particle Xenon
  • PillBug
  • Pimoroni Badger 2040
  • Pimoroni Interstate 75
  • Pimoroni Keybow 2040
  • Pimoroni Motor 2040
  • Pimoroni PGA2040
  • Pimoroni Pico LiPo (16MB)
  • Pimoroni Pico LiPo (4MB)
  • Pimoroni PicoSystem
  • Pimoroni Plasma 2040
  • Pimoroni Servo 2040
  • Pimoroni Tiny 2040 (2MB)
  • Pimoroni Tiny 2040 (8MB)
  • ProS3
  • PyCubedv04
  • PyCubedv04-MRAM
  • PyCubedv05
  • PyCubedv05-MRAM
  • PyKey 18 Numpad
  • PyKey 44 Ergo
  • PyKey 60
  • PyKey 87 TKL
  • RP2.65-F
  • RP2040 Stamp
  • Raspberry Pi Pico
  • Raspberry Pi Pico W
  • Robo HAT MM1 M4
  • S2Mini
  • S2Pico
  • SAM E54 Xplained Pro
  • SAM32v26
  • SSCI ISP1807 Dev Board
  • SSCI ISP1807 Micro Board
  • Saola 1 w/Wroom
  • Saola 1 w/Wrover
  • Seeed XIAO nRF52840 Sense
  • Seeeduino Wio Terminal
  • Seeeduino XIAO RP2040
  • Silicognition LLC M4-Shim
  • Silicognition LLC RP2040-Shim
  • SparkFun MicroMod RP2040 Processor
  • SparkFun MicroMod SAMD51 Processor
  • SparkFun MicroMod nRF52840 Processor
  • SparkFun Pro Micro RP2040
  • SparkFun Pro nRF52840 Mini
  • SparkFun Thing Plus - RP2040
  • SparkFun Thing Plus - SAMD51
  • Sprite_v2b
  • TG-Boards' Datalore IP M4
  • TG-Watch
  • TTGO T8 ESP32-S2-WROOM
  • Targett Module Clip w/Wroom
  • Targett Module Clip w/Wrover
  • Teknikio Bluebird
  • The Open Book Feather
  • TinkeringTech ScoutMakes Azul
  • TinyPICO
  • TinyPICO Nano
  • TinyS2
  • TinyS3
  • UARTLogger II
  • VCC-GND Studio YD RP2040
  • W5100S-EVB-Pico
  • W5500-EVB-Pico
  • WarmBit BluePixel nRF52840
  • Waveshare ESP32-S2-Pico
  • Waveshare ESP32-S2-Pico-LCD
  • Waveshare RP2040-Zero
  • WeAct Studio Pico
  • WeAct Studio Pico 16MB
  • Winterbloom Sol
  • iLabs Challenger 840
  • nanoESP32-S2 w/Wrover
  • nanoESP32-S2 w/Wroom
  • nice!nano
  • takayoshiotake Octave RP2040

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.

Limitations: RISE_AND_FALL is not available to RP2040 due to hardware limitations.

class countio.Counter(pin: microcontroller.Pin, *, edge: Edge = Edge.FALL, pull: Optional[digitalio.Pull] = None)

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 (Edge) – which edge transitions to count

  • pull (Optional[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=countio.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() None

Deinitializes the Counter and releases any hardware resources for reuse.

__enter__() Counter

No-op used by Context Managers.

__exit__() None

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

reset() None

Resets the count back to 0.