button - Start/Stop a function using pushbutton -


i trying display readings of ldr on 0.96" adafruit oled. have succeeded obtaining results. want start display of reading when push button , stop once push again. should go on loop. tried draft code that:

#include <spi.h> #include <wire.h> #include <adafruit_gfx.h> #include <adafruit_ssd1306.h> int sensorpin = a0; // select input pin ldr int sensorvalue = 0; boolean state = false; int buttonpin;   #define oled_reset 4 // not used / nicht genutzt bei diesem display adafruit_ssd1306 display(oled_reset);   char inchar;  string string;   void setup()   {     pinmode(13, output);    buttonpin = 2; //whatever pin button plugged    pinmode(buttonpin, input_pullup);  // initialize i2c addr 0x3c / mit i2c-adresse 0x3c initialisieren  display.begin(ssd1306_switchcapvcc, 0x3c);    serial.begin(9600);   display.display();   delay(2000);   display.cleardisplay();    display.settextcolor(inverse);  }  void loop() {   while (state == false)    {      if (digitalread(buttonpin) == high)      {       display.cleardisplay();       sensorvalue = analogread(sensorpin);       serial.println(sensorvalue);        display.setcursor(30,0);        display.settextsize(1);       display.print("ldr reading:");       display.setcursor(30,10);        display.settextsize(2);       display.print(sensorvalue);       delay(500);                  display.display();        state = false;       }      }  }

but screen starts displaying results when keep push button pressed continuously , when release button , program halts last reading displayed on screen.

i need results follows:

1st press: starts displaying readings
2nd press: screen should blank. (display.cleardisplay() job)

i unfamiliar usage of switch case in arduino.

keep boolean track toggle state , boolean keep state of button previous loop. if button goes low high between loop iterations update toggle boolean, 

toggle = !togggle

base condition display state on toggle instead of directly on button.


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