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I2C Keypad

makecode I2C Keypad extension for micro:bit

Matrix keypad with custom controller connected to micro:bit through I2C.

Code is mostly duplicated from MakerBit Touch extension

Usage

In your micro:bit makecode project click on Extensions under the gearwheel menu search for devegied/pxt-i2c-keypad and import

API

i2cKeypad=github:devegied/pxt-i2c-keypad

i2cKeypad.initKeypadController("123A456B789C*0#D")

Optionaly initialize the keypad controller by defining key symbols

• symbols on keypad keys from left to right and from top to bottom expressed as a string, eg: "123A456B789C*0#D"

i2cKeypad.onKey(i2cKeypad.Keys.K1, i2cKeypad.KeyAction.Pressed, () => {})

Do something when a key is pressed or released.

• key (has a picker UI), the key to be checked, eg: Keys.K1
• action (has a picker UI), the trigger action, eg: KeyAction.Pressed
• handler, code to run when the event is raised

i2cKeypad.onKeysPressed("*#", (theKey,stringBeforeTheKey) => {})

Do something when any of the symbols are entered.

• keys, any of the symbols in this string will initiate execution, eg: "*#"
• cb, code to run when the event is raised
• theKey, symbol of the key that initiated this execution
• stringBeforeTheKey, the symbols entered since the last execution as a string

i2cKeypad.currentKey()

Returns the key index of the last key event that was received. It could be either a key pressed or released event.

i2cKeypad.currentSymbol()

Returns the key symbol of the last key event that was received. It could be either a key pressed or released event.

i2cKeypad.isPressed(1)

Returns true if a specific key is currently pressed. False otherwise.

• keyIndex (has a picker UI), the key index to be checked

i2cKeypad.wasPressed()

Returns true if any key was pressed since the last call of this function. False otherwise.

Demo

First example shows key index and key symbol when keypad buttons are pressed

i2cKeypad.onKey(i2cKeypad.Keys.Any, i2cKeypad.KeyAction.Pressed, function () {
    basic.showString("" + convertToText(i2cKeypad.currentKey()) + "-" + i2cKeypad.currentSymbol())
})
i2cKeypad.onKey(i2cKeypad.Keys.Any, i2cKeypad.KeyAction.Released, function () {
    basic.clearScreen()
})
i2cKeypad.initKeypadController("123A456B789C*0#D")

Second example shows PINcode validation. PIN code entrance is finished by pressing #, half entered code can be cleared by pressing *

i2cKeypad.onKeysPressed("*#", function (theKey, stringBeforeTheKey) {
    if (theKey == "#" && stringBeforeTheKey == pinCode) {
        basic.showIcon(IconNames.Happy)
    } else {
        basic.showIcon(IconNames.Sad)
    }
})
let pinCode = ""
pinCode = "1234"

Blocks preview

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i2cKeypad.initKeypadController("123A456B789C*0#D")
i2cKeypad.onKey(i2cKeypad.Keys.K1, i2cKeypad.KeyAction.Pressed, () => {

})
i2cKeypad.onKeysPressed("*#", (theKey,stringBeforeTheKey) => {

})
i2cKeypad.currentKey()
i2cKeypad.currentSymbol()
i2cKeypad.isPressed(1)
wasPressed()

License

Licensed under the MIT License (MIT). See LICENSE file for more details.

Copyright (c) 2022, devegied Copyright (c) 2020, MakerBit

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