Hello,
I am in need of some guidance with a project that I am trying to work on involving a Arduino Uno and a OLED.
Project description:
3 timers (different time lengths each)
Timers 1, 2, 3 triggered to start with a momentary switch
When the countdown is complete, trigger a relay that corresponds to the timer that was set (relay 1,2 or 3).
Display the time of the countdown on the OLED display as well as the serial monitor.
When the time is complete, display DONE until another timer is started.
Here is my start which works for the timers, bot does not display properly:
#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#define OLED_ADDR 0x3C
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
char
szString[20];
byte
mins, secs;
unsigned long
timeTemp,
timeNow,
timeStart,
timeElapsed,
timeLeft;
Adafruit_SSD1306 display(-1);
const int SwitchPin1 = 2;
const int SwitchPin2 = 4;
const int SwitchPin3 = 7;
const int RelayPin1 = 13;
const int RelayPin2 = 12;
const int RelayPin3 = 8;
unsigned long startTime1 = 5000;
unsigned long startTime2 = 10000;
unsigned long startTime3 = 15000;
const long interval = 1000;
int SwitchState1 = 0;
int SwitchState2 = 0;
int SwitchState3 = 0;
void setup() {
// initialize and clear display
display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
display.clearDisplay();
display.setTextSize(3);
display.setTextColor(WHITE);
Serial.begin(9600);
timeStart = millis();
mins = 1;
secs = 1;
pinMode(RelayPin1, OUTPUT);
pinMode(RelayPin2, OUTPUT);
pinMode(RelayPin3, OUTPUT);
pinMode(SwitchPin1, INPUT);
pinMode(SwitchPin2, INPUT);
pinMode(SwitchPin3, INPUT);
}
void DoCountdown()
{
static unsigned long
lastTimeNow = 0;
static byte
lastsecs = 1;
timeNow = millis();
timeElapsed = timeNow - timeStart;
if( mins == 0 && secs == 0 )
return;
timeLeft = startTime1 - timeElapsed;
mins = (byte)(timeLeft / 60000ul);
timeTemp = timeLeft - (mins * 60000);
secs = (byte)(timeTemp / 1000ul);
timeTemp = timeTemp - (secs * 1000ul);
if( mins == 0 && secs == 0 )
{
display.clearDisplay();
sprintf( szString, "DONE" );
Serial.println( szString );
display.setCursor( 10, 10 );
display.print( szString );
display.display();
}//if
else if( secs != lastsecs )
{
lastsecs = secs;
display.clearDisplay();
sprintf( szString, "%02d:%02d", mins, secs );
Serial.println( szString );
display.setCursor( 30, 10 );
display.print( szString );
display.display();
}//if
}
void loop() {
//Relay 1 :
SwitchState1 = digitalRead(SwitchPin1);
if (SwitchState1 == HIGH)
{
startTime1 = millis();
DoCountdown();
digitalWrite(RelayPin1, HIGH);
}
if (millis() - startTime1 >= interval)
{
digitalWrite(RelayPin1, LOW);
}
//Relay 2 :
SwitchState2 = digitalRead(SwitchPin2);
if (SwitchState2 == HIGH)
{
startTime2 = millis();
DoCountdown();
digitalWrite(RelayPin2, HIGH);
}
if (millis() - startTime2 >= interval)
{
digitalWrite(RelayPin2, LOW);
}
//Relay 3 :
SwitchState3 = digitalRead(SwitchPin3);
if (SwitchState3 == HIGH)
{
startTime3 = millis();
DoCountdown();
digitalWrite(RelayPin3, HIGH);
}
if (millis() - startTime3 >= interval)
{
digitalWrite(RelayPin3, LOW);
}
}
