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Arduino ATtiny85 kitchen countdown timer

Countdown Timer: Range 1-99 minutes. Output: time (mm:ss) to seven segment display(TM1637) and Audio to Buzzer. Input: Push button to start.

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Name: timer_arduino

Title: Micro-controller Countdown Timer

Description: Countdown Timer: Range 1-99 minutes. Output time (mm:ss) to seven segment display(TM1637) and Audio to Buzzer. Input: Push button to start. 10K Pot used for time select.

Note: Two alternative designs, two different ino files. One with Attiny85 IC the other with an arduino nano.

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k1200s wrote 08/19/2019 at 02:20 point

I've made this project, it's working fine.

But I'd like to improve 2 things, let's see if you can help me:

- during the countdown, the 2 separating dots (mm:ss) are not visible, only in the time setting. What should be the changes in the code to make them visible also in the countdown?

My display is a little different from yours: it has also a decimal point at the right of each digit.

- the buzzer alarm, when the time reaches 00:00 it's like a two tone siren. Can we change it to a loud beep?

Thanks!

Eduardo

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Ken Yap wrote 08/19/2019 at 02:58 point

Check the TM1637 data sheet but I think the colon's cathode is driven by the 8th segment line and the anode is common to the hours drive. So you just have to edit the output routine to turn on the 8th bit during the 2nd time slot, which is minutes during countdown.

You may have a variant display that has decimal points in addition to the colon. AFAICT there aren't enough segment lines on the TM1637 to handle both the colon or DP, so the DP probably isn't active.

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k1200s wrote 08/22/2019 at 17:39 point

Thanks Ken!

I should be able to borrow a display similar to the original one, with the colon only, and check if it behaves like I asked before.

Regarding the buzzer tone question, do you have any idea of how can I change the sound?

Cheers!

Eduardo

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Ken Yap wrote 08/22/2019 at 20:27 point

Sorry I haven't looked at the code to see how the sound is generated. Only know about the TM1637 from using it.

  Are you sure? yes | no

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