Arduino Countdown Timer using the easier to find MAX7219 module!

Let's remake the Countdown timer, this time using the easier to find: 8Bits 7 Segments module controlled by the popular MAX7219 chip!

[grahamvernon]

I am 78 And love Watching your Videos Keep them coming.

[BrainybitsCanada]

Just want to say a huge Thank You! to all of our YouTube subscribers to help us reach this 10, 000 subs milestone! Thanks for watching, liking and subscribing! Hope to be able to bring you more Tutorials this coming year... Take care!

[grahamvernon]

Is there a way of adding a potentiometer to the code so i can vary the time, without having to alter the countdown timer code?

[ryansfamily]

Orsome tutorial. I just made it! I have always wanted a cool countdown timer like this. It also got me thinking, so now I'm working on adding a few buttons. One to increment the countnumber variable by minutes with button presses (and somehow display this) and another button to start the count down. This might take me a while though as I'm just a beginner.
Love your tutorials! Learning heaps and have become inspired!

[KAFA]

I'm very very happy for your tutorials.I'm making a car meter as project. Here I'm using such MAX7219 module to display.I'm using 3 pieces of MAX7219 module. 1st for speed, 2nd for distance, 3rd for elapsed time.I'm facing some problem to complete the task. Therefore I'm cordially requesting you to help to about how to write the Arduino code.

[kevoice]

Probably don't want to try to get through TSA with this one :)

[garthhowe]

You could post renovation videos as well ... I enjoy watching the DIY shows on television. Thanks for the video.... I too have slowed in my electronics fiddling ... catching up with leaf raking, garden weeding, all that fun stuff.

[wonderfulwombats]

Hi! I was wondering how difficult it would be to make a DD:HH:MM:SS timer (As a prop in a movie, it wouldn't have to be accurate or anything)
I'm a total noob at this, but I'm willing to learn.

[Vikingza]

Hi, thank you for the wonderful tutorial, but how would you do the timer with a start, stop and reset back to start number inputs? And how would you do a count down timer for MM:SS only?

[edwinmelgarejo]

I'm wanting to set the account in 5 minutes and it does not work. I also want to add a start button. Can you suggest something to modify the program? Thanks very much Edwin

[Tybeebee]

Is there any way to make it so all of the digits read zero and then use an arcade button to increase by a unit of 1 every time the button is pressed? Desperately seeking help, first time using any of these things and I am really struggling to find the right video

[lazybeastz]

how accurate is this timer do you know? Accurate to 1 ms or better? I downloaded the code from your website and its working well.

[tomi]

Can the timer be slowed down? If so what parameter controls the speed of the timer ?

[charlesdelv.]

Hi friend!!! welcome again!!
Greetings from Colombia!!! good job!!

[akroutsamo]

Hi, how are u
we miss u this long
any news about the cnc ;)
like always great tuto,
congrats o the 10.000 subs (y)
i really like your website, did u made it ur self ? is it a wordpress creation ?
thanks

[MrJaimz]

How about the count up by mili second? Can you help me with the code? thank you.

[sksuman]

how to activate point after a digit? please tell me the code.

[MrGarfield]

Hi there, i like your videos, Just have one question, Why the headless shot when you signing off / starting the tutorial ( looks like a James Bond bad guy )

Greetings from The Neterlands :)

[saintpine]

I would just like to warn you about a design flaw in this module when you need to cascade modules together.

I have just finished successively daisy chaining 5 of them.

Unfortunately there is a design error in the module you are showing, the Vcc OUT is connected AFTER D1, in other words, the first module with work on Vcc -- Voltage drop over D1 ie: 4.3V, the second will work at 4.3V minus Voltage drop over D1 = 3.4V, the next module will work in an unpredictable manor working under 2.7V.

The solution is to de-solder the D1 and jumper the pads. or the solution I prefer, solder a pin on the via that is near the diode (you can see the Pcb track going from diode to the via. and place the Vcc power connection on this pin.

DO NOT connect each module directly to 5V leaving the diode in place, because the chip will work at 4.3V and supply the logic level to the next module that requires the logic in a 5V range.

[tomi]

Is it possible to make the tenth seconds start at 59 rather than 99 ?