Embedded Files
An Arduino can be used to do many varied tasks, but one of the most common tasks is setting it up to read a simple push button switch.
For this exercise we will be using the Digital I/O side of the Arduino board (see Fig 1) and a push button switch (see Fig 2)You will also need a 10K and a 220R fixed Resistor.
For this exercise we will be using the Digital I/O side of the Arduino board (see Fig 1) and a push button switch (see Fig 2)You will also need a 10K and a 220R fixed Resistor.
You now need to think about how to connect your Switch to the Arduino and to program it.
Fig 3 shows how to setup a breadboard to allow a push button switch to power an LED (if you have followed through the previous exercises , you should be able to work out the voltages going into the Arduino when the switch is pressed or not).
For this setup I have connected the Switch to Pin 2 and the LED to Pin 13.
Remember to connect your negative breadboard rail to the ground connection of the Arduino and the positive rail to the +5V connection on the Arduino.
See if you can program it yourself! If not, Fig 4 will give you an example.
Fig 3 shows how to setup a breadboard to allow a push button switch to power an LED (if you have followed through the previous exercises , you should be able to work out the voltages going into the Arduino when the switch is pressed or not).
For this setup I have connected the Switch to Pin 2 and the LED to Pin 13.
Remember to connect your negative breadboard rail to the ground connection of the Arduino and the positive rail to the +5V connection on the Arduino.
See if you can program it yourself! If not, Fig 4 will give you an example.
Fig 3
Fig 4
TEXT File
// constants won't change. They're used here to set pin numbers:const int buttonPin = 2; // the number of the pushbutton pinconst int ledPin = 13; // the number of the LED pin
// variables will change:int buttonState = 0; // variable for reading the pushbutton status
void setup() { // initialize the LED pin as an output: pinMode(ledPin, OUTPUT); // initialize the pushbutton pin as an input: pinMode(buttonPin, INPUT);}
void loop() { // read the state of the pushbutton value: buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed. If it is, the buttonState is HIGH: if (buttonState == HIGH) { // turn LED on: digitalWrite(ledPin, HIGH); } else { // turn LED off: digitalWrite(ledPin, LOW); }}
The code shown below will allow you to set up your switch to latch on and off (you may wish to see https://sites.google.com/sheffield.ac.uk/diamond-electronics/1-basic-knowledge/switches as a recap on switches).
See how you can use this code to set a series of events happening with multiple switches.
Arduinodebouncesw.mp4Page updated
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