on Event

Run some code when a button (A, B, or both A + B) is clicked, double clicked, or has some other action.

input.buttonA.onEvent(ButtonEvent.Click, () => {



If your board has pins or pads that work as touch inputs, then your code can use them just like buttons. Instead of saying button A or button B as the input source, use a pin name like pin A1.

input.pinA1.onEvent(ButtonEvent.Down, function() {
    console.log("Press down")

Read about touch sensors and using the pins as touch buttons.


  • ev the button action to run some code for. The button actions (events) are:
    • click: button was clicked (pressed and released)
    • double click: button is clicked two times really fast (pressed and released, twice but quickly)
    • long click: button is pressed and released after being held down for a long time, like one second or longer
    • up: button is released from just being pressed
    • down: button is just pressed down
    • held: button was pressed and is still pressed
  • body the code you want to run when something happens with a button


Button release

Wnen the B button is released, log a message.

input.buttonB.onEvent(ButtonEvent.Up, function() {
    console.log("Release button")

Touch down

Log a message when you touch or release the capacitive pin pin A1 on the board.

input.pinA1.onEvent(ButtonEvent.Down, function() {
    console.log("Touch pin")
input.pinA1.onEvent(ButtonEvent.Up, function() {
    console.log("Release pin")

See also

is pressed, was pressed, random

Touch sensors