jasonacox
commented
3 years ago Hi @XOIIO - I think I understand what you are trying to do. You might be over-complicating it. The key thing to remember is that millis() is your accurate clock in milliseconds. You basically want to measure time as a delta from that (elapsed time) and use that to produce the countdown display (subtraction).
Here is my take on what I think you are trying to do:
#include <TM1637TinyDisplay6.h>
/* Digital Pins to TM1637 */
#define CLK 10
#define DIO 11
/* Useful Constants */
#define SECS_PER_MIN (60UL)
#define SECS_PER_HOUR (3600UL)
#define SECS_PER_DAY (SECS_PER_HOUR * 24L)
/* Useful Macros for time (s) */
#define numberOfSeconds(_time_) (_time_ % SECS_PER_MIN)
#define numberOfMinutes(_time_) ((_time_ / SECS_PER_MIN) % SECS_PER_MIN)
#define numberOfHours(_time_) (( _time_% SECS_PER_DAY) / SECS_PER_HOUR)
#define elapsedDays(_time_) ( _time_ / SECS_PER_DAY)
#define hmsToMillis(_h_, _m_, _s_) ((_h_ * SECS_PER_HOUR) + (_m_ * SECS_PER_MIN) + _s_ ) * 1000ul;
/* Set up Display */
TM1637TinyDisplay6 display(CLK, DIO);
/* Global Variables in milliseconds */
unsigned long startTime;
unsigned long lastLoopTime;
unsigned long startCount;
unsigned long dispout;
void setup()
{
display.setBrightness(BRIGHT_HIGH);
display.clear();
display.showString("boot");
delay(500);
// Record Epoch - Same as Timer Reset
startTime = millis();
// Time to countdown from in h, m, s
startCount = hmsToMillis(1, 0, 10);
}
void loop()
{
unsigned long timeNow = millis();
unsigned long timeElapsed = timeNow - startTime; // true amount of time since start
unsigned long counter = startCount - timeElapsed; // current state of countdown
// Update Display - every 10ms
if (timeNow - lastLoopTime >= 10) {
lastLoopTime = timeNow; // remember last time we displayed
// Compute the values
unsigned long HOURS = numberOfHours(counter / 1000);
unsigned long MINUTES = numberOfMinutes(counter / 1000);
unsigned long SECONDS = numberOfSeconds(counter / 1000);
unsigned long MILLISECONDS = (counter % 1000lu) / 10;
// Convert time values to integer to display
if (HOURS <= 0) {
//This one if timer is below one hour
dispout = ((MINUTES * 10000) + (SECONDS * 100) + MILLISECONDS);
} else {
//This one if timer is above one hour
dispout = ((HOURS * 10000) + (MINUTES * 100) + SECONDS);
}
uint8_t dots = 0b01010000;
display.showNumberDec(dispout, dots);
}
}
JunctionRunner
Hi, so I have a thread on the arduino forum where I'm working on a countdown timer where you enter the time with a matrix keypad, and the desired behavior is that if the time is one hour or greater, the display shows it as such
02.25.30
as in two hours, 25 minutes, 30 seconds.
Then, when it drops to one hour and below, I want to have milliseconds update on the display, so it all shifts over like so
59.30.12
59 minutes, 30 seconds, 12ms
However, when I try to update the display at speed in my sketch it slows the whole thing down, basically making one second take three seconds. If I displayed the time in only milliseconds, without turning it into a two digit value, 700ms would take an entire three seconds to change to 600ms, however, the last two digits update extremely fast without any issue.
Its really peculiar, and the sketch being slowed down is fixed by commenting out the display.showNumberDec line, so it's somehow related to the output.
I figure you might be able to help or have a clue as to why this is, the display is clearly able to update extremely fast, but for some reason in this sketch, it bogs down.
Heres my forum thread, with the later few posts being the one cracking down on identifying the issue. https://forum.arduino.cc/t/need-help-setting-up-a-countdown-timer-which-you-set-using-a-keypad/864081/43
`#include
//
//// Module connection pins (Digital Pins)
define CLK 10
define DIO 11
TM1637TinyDisplay6 display(CLK, DIO); unsigned long dispout;
byte hours = 0; byte minutes = 12; byte seconds = 10;
//number of milliseconds; unsigned long counter = ((hours 3600ul) + (minutes 60ul) + seconds ) * 1000ul;
unsigned long timeMICROS; unsigned long secondMICROS; unsigned long timeMillis;
unsigned long num; unsigned long leftDecimal; unsigned long rightDecimal;
unsigned long HOURS; unsigned long temp; unsigned long MINUTES; unsigned long SECONDS; unsigned long MILLISECONDS;
void setup() { display.setBrightness(BRIGHT_LOW); display.clear(); display.showString("boot");
Serial.begin(115200); // <---------------------<<<<<<<<<<<<<<<<<
Serial.println("Start the count down");
} //END of setup()
void loop() { unsigned long timeNow = micros();
//***** //every 1ms do this if (timeNow - timeMICROS >= 1000) { //restart the TIMER timeMICROS = timeMICROS + 1000;
}
//***** // RAW 10X milliseconds //every 10ms // if (timeNow - secondMICROS >= 10000) //10000 = 10ms // { //restart the TIMER //secondMICROS = timeNow;
//restart the TIMER // secondMICROS = secondMICROS + 10000;
// num = counter; // leftDecimal = num / 1000; // rightDecimal = (counter - leftDecimal * 1000) / 10; // Serial.print("Milliseconds = "); // Serial.print(leftDecimal); // Serial.print("."); // Serial.println(rightDecimal); // }
//***** //every 10ms do this //if (millis() - timeMillis >= 10)
//every 100ms do this if (millis() - timeMillis >= 100) { //restart the TIMER every 10ms timeMillis = timeMillis + 10;
// dispout = ((HOURS 10000) + (MINUTES 100) + SECONDS); //This one if timer is above one hour dispout = ((MINUTES 10000) + (SECONDS 100) + MILLISECONDS); //This one if timer is below one hour
} `