what's button

Buttons are a common component used to control electronic devices. They are usually used as switches to connect or disconnect circuits. Although buttons come in a variety of sizes and shapes, the one used in this experiment will be a 12mm button as shown in the following pictures. Pins pointed out by the arrows of same color are meant to be connected.

The button we used is a normally open type button. The two contacts of a button is in the off state under the normal conditions, only when the button is pressed they are closed

1 * button
1 * microbit
- Several Jumper wires

connection diagram：

Code:
makecode:

MU python:

#-----------------------------------------------------------
# File name   : Touch button.py
# Description : The key state is displayed in led matrix lamp.
# Author      : jason
# E-mail      : jason@adeept.com
# Website     : www.adeept.com
# Date        : 2019/01/15
#-----------------------------------------------------------
from microbit import *
 
while True:
    buttonState = pin5.read_digital()
    if buttonState==1:
        display.show(Image.YES)
    else:
        display.clear()
    sleep(20)

Click “flash” and download the code onto the micro:bit.
Effect Picture：

Components
- 1 * Adeept Arduino UNO R3 Board
- 1 * Button Module
- 1 * LED Module
- 1 * USB Cable
- 2 * 3-Pin Wires
- 2 * Hookup Wire Set
- 1 * Breadboard

Step 1: Build the circuit

Code:

/***********************************************************
File name: _02_ButtonModule.ino
Description: When you press the button, you can see the state
              of the LED will be toggled. (ON->OFF，OFF->ON).
Website: www.adeept.com
E-mail: support@adeept.com
Author: Tom
Date: 2019/01/15 
***********************************************************/
 
int ledpin=13;            //definition digital 11 pins as pin to control the LED module
int btnpin=2;             //Set the digital 2 to button module interface 
 
volatile int state = LOW; // Defined output status LED Interface
 
void setup()
{
  pinMode(ledpin,OUTPUT);//Set digital 11 port mode, the OUTPUT for the output
  pinMode(btnpin,INPUT); //Set digital 2 port mode, the INPUT for the input
}
 
void loop()
{
  if(digitalRead(btnpin)==HIGH)          //Detection button interface to low
  {   
      delay(10);                        //Delay 10ms for the elimination of key leading-edge jitter
      if(digitalRead(btnpin)==HIGH)      //Confirm button is pressed
      {     
        while(digitalRead(btnpin)==HIGH);//Wait for key interfaces to high
        delay(10);                      //delay 10ms for the elimination of key trailing-edge jitter
        while(digitalRead(btnpin)==HIGH);//Confirm button release
        state = !state;                 //Negate operation, each time you run the program here, state the HGIH becomes LOW, or the state becomes the LOW HGIH.
        digitalWrite(ledpin,state);     //Output control status LED, ON or OFF 
      }
   }
}

Compile and download the sketch to the UNO R3 board.

Press the button and you can see the LED toggle between on and off.

Components
- 1 * Raspberry Pi
- 1 * GPIO Extension Board
- 1 * 40-Pin GPIO Cable
- 1 * Breadboard
- 1 * Button Module
- 1 * LED Module
- 2 * 3-Pin Wires

Build the circuit

Code:
C code:
code 1

/*
* File name   : btnAndLed_1.c
* Description : Toggle a led by button.
* Website     : www.adeept.com
* E-mail      : support@adeept.com
* Author      : Jason
* Date        : 2019/01/15
*/
#include <wiringPi.h>
#include <stdio.h>
 
#define LedPin    0
#define ButtonPin 1
 
int status = 1;
 
void myISR(void)
{
	status = !status;	
}
 
int main(void)
{
	if(wiringPiSetup() == -1){ //when initialize wiring failed,print message to screen
		printf("setup wiringPi failed !\n");
		return -1; 
	}
 
	pinMode(LedPin, OUTPUT); 
	pinMode(ButtonPin, INPUT);
 
	pullUpDnControl(ButtonPin, PUD_UP);
 
	if(wiringPiISR(ButtonPin, INT_EDGE_FALLING, myISR) < 0){
		printf("ISR setup error!\n");
		return -1;
	}
 
	while(1){
		digitalWrite(LedPin, status);
	}
 
	return 0;
}

code 2

/*
* File name   : btnAndLed_2.c
* Description : Toggle a led by button.
* Website     : www.adeept.com
* E-mail      : support@adeept.com
* Author      : Jason
* Date        : 2019/01/15
*/
#include <wiringPi.h>
#include <stdio.h>
 
#define LedPin    0
#define ButtonPin 1
 
int status = 1;
 
int main(void)
{
	if(wiringPiSetup() == -1){ //when initialize wiring failed,print message to screen
		printf("setup wiringPi failed !\n");
		return -1; 
	}
 
	pinMode(LedPin, OUTPUT); 
	pinMode(ButtonPin, INPUT);
 
	pullUpDnControl(ButtonPin, PUD_UP);
 
	while(1){
		if(digitalRead(ButtonPin) == 0){
			delay(10);
			if(digitalRead(ButtonPin) == 0){
				status = !status;
				digitalWrite(LedPin, status);   //toggle the status of led	
				printf("The status of led is toggled !\n");
			}
			while(!digitalRead(ButtonPin));
		}
	}
 
	return 0;
}

python code:
code 1

#!/usr/bin/env python
import RPi.GPIO as GPIO
 
LedPin = 11    # pin11 --- led
BtnPin = 12    # pin12 --- button
 
def setup():
	GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location
	GPIO.setup(LedPin, GPIO.OUT)   # Set LedPin's mode is output
	GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)    # Set BtnPin's mode is input, and pull up to high level(3.3V)
	GPIO.output(LedPin, GPIO.HIGH) # Set LedPin high(+3.3V) to make led off
 
def loop():
	while True:
		if GPIO.input(BtnPin) == GPIO.LOW: # Check whether the button is pressed or not.
			print '...led on'
			GPIO.output(LedPin, GPIO.LOW)  # led on
		else:
			print 'led off...'
			GPIO.output(LedPin, GPIO.HIGH) # led off
 
def destroy():
	GPIO.output(LedPin, GPIO.HIGH)     # led off
	GPIO.cleanup()                     # Release resource
 
if __name__ == '__main__':     # Program start from here
	setup()
	try:
		loop()
	except KeyboardInterrupt:  # When 'Ctrl+C' is pressed, the child program destroy() will be  executed.
		destroy()

code 2

#!/usr/bin/env python
import RPi.GPIO as GPIO
 
LedPin = 11    # pin11 --- led
BtnPin = 12    # pin12 --- button
 
Led_status = 1
 
def setup():
	GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location
	GPIO.setup(LedPin, GPIO.OUT)   # Set LedPin's mode is output
	GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)    # Set BtnPin's mode is input, and pull up to high level(3.3V)
	GPIO.output(LedPin, GPIO.HIGH) # Set LedPin high(+3.3V) to make led off
 
def swLed(ev=None):
	global Led_status
	Led_status = not Led_status
	GPIO.output(LedPin, Led_status)  # switch led status(on-->off; off-->on)
	if Led_status == 1:
		print 'led off...'
	else:
		print '...led on'
 
def loop():
	GPIO.add_event_detect(BtnPin, GPIO.FALLING, callback=swLed) # wait for falling
	while True:
		pass   # Don't do anything
 
def destroy():
	GPIO.output(LedPin, GPIO.HIGH)     # led off
	GPIO.cleanup()                     # Release resource
 
if __name__ == '__main__':     # Program start from here
	setup()
	try:
		loop()
	except KeyboardInterrupt:  # When 'Ctrl+C' is pressed, the child program destroy() will be  executed.
		destroy()

For C language users:

Step 2: Edit and save the code with vim or nano.

(code path: /home/Adeept_Sensor_Kit_for_RPi_C_Code/02_btnAndLed/btnAndLed_1.c)

Step 3: Compile

$ sudo gcc btnAndLed_1.c -o btnAndLed -lwiringPi

Step 4: Run

$ sudo ./btnAndLed

For Python users:

Step 2: Edit and save the code with vim or nano.

(code path: /home/Adeept_Sensor_Kit_for_RPi_Python_Code/02_btnAndLed/btnAndLed_1.py)

Step 3: Run

$ sudo python btnAndLed_1.py

Press the button and you can see the LED toggle between on and off

Link for code download：http://www.adeept.com/learn/ Download the kit information as needed.
Video link：http://www.adeept.com/video/