Previously we published some Arduino guides which use the millis function. Arduino 2 LED was a basic project, Arduino Flip-Flop Blinking LED With Push Button is somewhat advanced project. Others were One Push Button Multiple Functions supporting Single Press, Double Press, Long-Time Press, Arduino Blink LED Rate Depending On Push Button Press Duration etc. In this guide we will use 3 LEDs and one push button. For this project, we will need :
- One Arduino UNO or simillar board
- 3 LEDs
- 1 Pushbutton
- 3 x 220 Ohm value resistors
- 1 x 1K Ohm value resistor
- 1 Breadboard
- Few jumper wires
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220 Ohm value resistors are for the 3 LEDS, 1K Ohm value resistor is for the push button. We will add the pushbutton on pin 7, first LED1 on pin 8, second LED on pin 9 and third LED on pin 10 of Arduino board. This will be the connection :
Following oficial sources of Arduino are used in this sample example code :
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# https://playground.arduino.cc/Code/Enum https://playground.arduino.cc/French/SwitchCase https://www.arduino.cc/reference/en/language/functions/advanced-io/pulsein/ # |
Here is the complete code :
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// Pin assignement #define btnPin A0 #define led1Pin 8 #define led2Pin 9 #define led3Pin 10 enum fcnMode { OFF, LED1, LED2, LED3, FADE1, ALL, BLINK, NBSTATE }; // OFF = 0 and NBSTATE=7 int ledState1 = LOW,ledState2 = LOW,ledState3 = LOW; // ledState used to set the LED unsigned long buttonState = 0; int funcState=0; unsigned long currentMillis1,currentMillis2,currentMillis3; // will store current time unsigned long previousMillis1,previousMillis2,previousMillis3; // will store last time LED was updated const long interval1 = 100; // interval at which to blink (milliseconds) const long interval2 = 300; const long interval3 = 500; /******************************************************************\ * PRIVATE FUNCTION: setup * * PARAMETERS: * ~ void * * RETURN: * ~ void * * DESCRIPTIONS: * Initiate inputs/outputs * \******************************************************************/ void setup(){ Serial.begin(9600); // initialize serial port pinMode(btnPin,INPUT_PULLUP); pinMode(led1Pin,OUTPUT); pinMode(led2Pin,OUTPUT); pinMode(led3Pin,OUTPUT); } /******************************************************************\ * PRIVATE FUNCTION: loop * * PARAMETERS: * ~ void * * RETURN: * ~ void * * DESCRIPTIONS: * Main Function of the code \******************************************************************/ void loop(){ buttonPressed(); setMode(); } /****************************************************************** * SUBFUNCTIONS \******************************************************************/ void buttonPressed() { buttonState = pulseIn(btnPin,HIGH,1000000); if (buttonState > 50){ funcState += 1; Serial.print("Button state n: "); Serial.println(funcState); } funcState=funcState%NBSTATE; } void setMode() { // All Off digitalWrite(led1Pin,LOW); digitalWrite(led2Pin,LOW); digitalWrite(led3Pin,LOW); Serial.print("Function : "); Serial.println(funcState); switch(funcState){ case OFF: break; case LED1: digitalWrite(led1Pin,HIGH); break; case LED2: digitalWrite(led2Pin,HIGH); break; case LED3: digitalWrite(led3Pin,HIGH); break; case FADE1: fade1(); break; case ALL: digitalWrite(led1Pin,HIGH); digitalWrite(led2Pin,HIGH); digitalWrite(led3Pin,HIGH); break; case BLINK: blinkLed1(); blinkLed2(); blinkLed3(); break; } } void fade1(){ int brightness = 0; int fadeAmount = 5; for (brightness=0;brightness<=255;brightness+=fadeAmount){ analogWrite(led1Pin, brightness); delay(30); } for (brightness=255;brightness>=0;brightness-=fadeAmount){ analogWrite(led1Pin, brightness); delay(30); } } void blinkLed1(){ currentMillis1 = millis(); if (currentMillis1 - previousMillis1 >= interval1) { // save the last time you blinked the LED previousMillis1 = currentMillis1; // if the LED is off turn it on and vice-versa: if (ledState1 == LOW) { ledState1 = HIGH; } else { ledState1 = LOW; } // set the LED with the ledState of the variable: digitalWrite(led1Pin, ledState1); } } void blinkLed2(){ currentMillis2 = millis(); if (currentMillis2 - previousMillis2 >= interval2) { // save the last time you blinked the LED previousMillis2 = currentMillis2; // if the LED is off turn it on and vice-versa: if (ledState2 == LOW) { ledState2 = HIGH; } else { ledState2 = LOW; } // set the LED with the ledState of the variable: digitalWrite(led2Pin, ledState2); } } void blinkLed3(){ currentMillis3 = millis(); if (currentMillis3 - previousMillis3 >= interval3) { // save the last time you blinked the LED previousMillis3 = currentMillis3; // if the LED is off turn it on and vice-versa: if (ledState3 == LOW) { ledState3 = HIGH; } else { ledState3 = LOW; } // set the LED with the ledState of the variable: digitalWrite(led3Pin, ledState3); } } |
This project is shared by aranacorp.com/en/arana-shop/. We lack copyright on diagram or code.
About Abhishek Ghosh
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