Tag Archives: Pushbutton

In this lesson we learn how to incorporate a push button switch into our Jetson Nano projects. We explain the concept of a pull up resistor, and show how to configure the GPIO pins as inputs. This will allow you to take your NVIDIA Jetson Nano projects to new heights. Enjoy!

Arduino, Tutorial

Arduino Tutorial 34: Simplest Way to Use a Pushbutton Switch

October 29, 2019 admin

In this lesson we show you a quick hack that will allow you to incorporate a pushbutton switch into an Arduino project without having to use an external pullup resistor, and still get very stable operation. The trick is to create a digital input pin, which in our example is pin 2. We then digitalWrite that INPUT pin HIGH. What that does is put an internal pullup resistor on pin 2, and then connects it to 5 volts. In effect, we are using a clever command to use the Arduino’s internal pullup resistors. The code below is what we used in the video. Enjoy!

int buttonPin=2;
int buttonValue;
int dt=100;
void setup() {
  // put your setup code here, to run once:
pinMode(buttonPin,INPUT);
digitalWrite(buttonPin,HIGH);
Serial.begin(9600);
}

void loop() {
  buttonValue=digitalRead(buttonPin);
  Serial.print("Your Button is: ");
  Serial.println(buttonValue);
  delay(dt);
}

int buttonPin=2;

int buttonValue;

int dt=100;

void setup() {

// put your setup code here, to run once:

pinMode(buttonPin,INPUT);

digitalWrite(buttonPin,HIGH);

Serial.begin(9600);

}

void loop() {

buttonValue=digitalRead(buttonPin);

Serial.print("Your Button is: ");

Serial.println(buttonValue);

delay(dt);

}

Arduino, Tutorial

Arduino Tutorial 28: Using a Pushbutton as a Toggle Switch

September 17, 2019 admin

In lesson 27 we learned how to incorporate a pushbutton into an arduino project. We learned how to utilize pull-up and pull-down resistors in order to incorporate a button into a circuit. The operation of the button in lesson 27 was pretty simple . . . if the button was held down, the LED would come on. When the button was released, the LED would turn back off. This is an interesting demonstration, but much more interesting is the case where we make a toggle switch. If you press and release the button, the LED comes on, and then if you press and release the button again, the LED goes off. While this sounds very similar to the previous case, it turns out to require a lot more thought. This video lesson explains how to think about this problem, and how to make it work.

If you want to follow along at home, you can order the Arduino Kit we are using HERE.

Below is the code we used to achieve the toggle operation. The video gives details on how to connect up the circuit.

int LEDState=0;
int LEDPin=8;
int buttonPin=12;
int buttonNew;
int buttonOld=1;
int dt=100;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(LEDPin, OUTPUT);
pinMode(buttonPin, INPUT);

}

void loop() {
buttonNew=digitalRead(buttonPin);
if(buttonOld==0 && buttonNew==1){
  if (LEDState==0){
    digitalWrite(LEDPin,HIGH);
    LEDState=1;
  }
  else{
    digitalWrite(LEDPin, LOW);
    LEDState=0;
  }
}
buttonOld=buttonNew;
delay(dt);
}

int LEDState=0;

int LEDPin=8;

int buttonPin=12;

int buttonNew;

int buttonOld=1;

int dt=100;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

pinMode(LEDPin, OUTPUT);

pinMode(buttonPin, INPUT);

}

void loop() {

buttonNew=digitalRead(buttonPin);

if(buttonOld==0 && buttonNew==1){

if (LEDState==0){

digitalWrite(LEDPin,HIGH);

LEDState=1;

}

else{

digitalWrite(LEDPin, LOW);

LEDState=0;

}

buttonOld=buttonNew;

delay(dt);

}

Technology Tutorials

Tag Archives: Pushbutton

AI on the Jetson Nano LESSON 57: Read a Push Button Switch on the GPIO Pins With Pull Up Resistors

Arduino Tutorial 34: Simplest Way to Use a Pushbutton Switch

Arduino Tutorial 28: Using a Pushbutton as a Toggle Switch

Making The World a Better Place One High Tech Project at a Time. Enjoy!