This function will accept the previous button state as an input and outputs the current debounced button
Because you’ll want to repeatedly debounce the switch value, it’s useful to define the steps for debouncing as a function that can be called each time. Within the program flow (listed in the preceding steps) is a series of repeating steps that need to be applied to changing variable values. Set the previous button state to the current button state. If the previous button state was low, and the current button state is high,Ħ. After 5ms, reread the button state and use that as the current button state.ĥ. If the current button state differs from the previous button state, wait 5msīecause the button must have changed state.Ĥ. Store a previous button state and a current button state (initializedģ. This program logic can be expressed as follows:ġ. Looks for a button state change, waits for the bouncing to finish, and then reads
#HOLD BUTTON TO KEEP LIGHT ON ARDUINO SOFTWARE#
Next, you write switch-debouncing software that If you know that the switch is going to do this, it is relatively straightforward However, the button actually bounces up and down before settling, as You would expect theīutton state to be immediately read as a high logic level as the graph on the left The button is physically pressed at the 25ms mark.
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