![]() The usual (MUCH better) choice is to use a ground connected "normally open" button or switch. Now lets look at how we can provide logic input signals to the Arduino.īuttons, switches, pull up (and pull down) In using a switch or push button to provide a digital input to the Arduino we basically have two options as shown here to connect one side of the switch or button to the ground 0V rail. Most Arduinos use the 328 or 32U4 chips the later Due, Zero and others use more powerful processors that run from 3.3V however the electrical characteristics are similar. In the following information, unless otherwise stated all data and values are taken from the data sheet for the ATMega328P which powers the Arduino Nano. However a common factor is that for all ArduinosĪ pin that is not programmed behaves as a digital input, Pin 7: Digital Input or Digital Output Pin 4: Digital Input, Digital Output or Analog input Pin 5: Digital Input, Digital Output or Pulse Width Modulated outputĮach member of the Arduino family has differences so you will need to check the pin configuration for the Arduino you are using. Lets look at some examples on the Arduino Nano I'll refer to the pin numbers as shown on the board itself. To give maximum flexibility each external connection on and Arduino board may share different functions. ![]() Behaviour of digital pins configured as inputs.Digital input characteristic and hysteresis levels.Values for pull-up, pull down, and protection resistors.Buttons, switches, pull up (and pull down).This article looks at some alternative ways of connecting digital input devices - switches and buttons. Introduction All the Arduino family of microcontrollers have pins that may be used as inputs.
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