Share My Creation LED Egg Timer

Seven segments LED display, Arduino Uno or Nano egg timer. Seconds displayed, minutes are set by buttons. Also buttons for start and stop, pressing together MIN and MINx10 resets the display. Alarm at the end of count down switches on a 5VDC buzzer or a LED.
The code multiplexes the 4 digits at frequency of 120Hz. LEDs are common cathode.
B4X:
Sub Process_Globals
    Private s(7) As Pin
    Private D8, D9, D10, D11, out12 As Pin
    Private minA0, minA1, stop, start As Pin
    Private cc1, cc2, cc3, cc4 As Byte
    Private run=False As Boolean
    Private seg() As Byte = Array As Byte(0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F)
End Sub

Private Sub AppStart

    For i=0 To 6    '7 segments output pins
        s(i).Initialize(i, s(i).MODE_OUTPUT)
    Next
    D8.Initialize(8, D8.MODE_OUTPUT)    '4 digits outputs
    D9.Initialize(9, D9.MODE_OUTPUT)
    D10.Initialize(10, D10.MODE_OUTPUT)
    D11.Initialize(11, D11.MODE_OUTPUT)
    out12.Initialize(12, out12.MODE_OUTPUT)    'alarm
    minA0.Initialize(minA0.A0, minA0.MODE_INPUT_PULLUP)    'minutes
    minA1.Initialize(minA1.A1, minA1.MODE_INPUT_PULLUP)    'minutes x 10
    stop.Initialize(stop.A2, stop.MODE_INPUT_PULLUP)
    start.Initialize(stop.A3, start.MODE_INPUT_PULLUP)

    set
End Sub

Sub set
    Do While True
    If minA0.DigitalRead=False And minA1.DigitalRead=True Then
        cc3=cc3+1
        If cc3>9 Then cc3=0
        mux(63)
    End If
    If minA1.DigitalRead=False And minA0.DigitalRead=True Then
        cc4=cc4+1
        If cc4>9 Then cc4=0
        mux(63)
    End If
    If minA1.DigitalRead=False And minA0.DigitalRead=False Then    'reset
        cc1=0
        cc2=0
        cc3=0
        cc4=0
    End If
    If start.DigitalRead=False Then
            If cc3>0 Or cc4>0 Or cc3>0 Or cc4>0 Then run=True
        End If
        mux(10)
      
    Do While run    'clock
        If cc1=0 And cc2=0 And cc3=0 And cc4=0 Then
            run=False
            alarm
        Else
            cc1=cc1-1
        End If
        If cc1=255 Then
            cc1=9
            cc2=cc2-1
            If cc2=255 Then
                cc2=5
                cc3=cc3-1
                If cc3=255 Then
                    cc3=9
                    cc4=cc4-1
              
                End If
            End If
        End If
        mux(112)
    Loop
      
    Loop
End Sub

Sub alarm
    Do While True
    out12.DigitalWrite(True)
    D8.DigitalWrite(False)
    D9.DigitalWrite(False)
    D10.DigitalWrite(False)
    D11.DigitalWrite(False)
    Delay(500)
    out12.DigitalWrite(False)
    mux(63)
    If stop.DigitalRead=False Then set
    Loop
End Sub

Sub mux(count As Byte)
    For i=0 To count
    D8.DigitalWrite(True)
    D9.DigitalWrite(False)
    D10.DigitalWrite(False)
    D11.DigitalWrite(False)
    seg_sel(seg(cc1))
    Delay(2)
  
    D8.DigitalWrite(False)
    D9.DigitalWrite(True)
    D10.DigitalWrite(False)
    D11.DigitalWrite(False)
    seg_sel(seg(cc2))
    Delay(2)
  
    D8.DigitalWrite(False)
    D9.DigitalWrite(False)
    D10.DigitalWrite(True)
    D11.DigitalWrite(False)
    seg_sel(seg(cc3))
    Delay(2)
  
    D8.DigitalWrite(False)
    D9.DigitalWrite(False)
    D10.DigitalWrite(False)
    D11.DigitalWrite(True)
    seg_sel(seg(cc4))
    Delay(2)
    If stop.DigitalRead=False Then run=False
    Next

End Sub

Sub seg_sel(sn As Byte)
    For i=0 To 6
        If (sn Mod 2)=1 Then s(i).DigitalWrite(True) Else s(i).DigitalWrite(False)
        sn=sn/2
    Next

End Sub
 

Attachments

  • egg.zip
    1.4 KB · Views: 61
  • egg timer405.jpg
    egg timer405.jpg
    22.7 KB · Views: 321
  • egg_timer_arduino.gif
    egg_timer_arduino.gif
    9.1 KB · Views: 26
Last edited:

Peter Simpson

Expert
Licensed User
Dam it, I don't have a batch of BC377 in stock, oh well :(

Hiya @moty22,
This is a great little project and your code appears to be relatively simple to follow, nice coding in fact. This would be a great little project for new to B4R developers and also the younger generation to learn from 👍

Hmm, knowing the younger generation they would probably just use their phones as egg timers, or just order an Uber eats instead lol :D

Brilliant example...
 
Last edited:

moty22

Active Member
Licensed User
Hmm, knowing the younger generation they would probably just use their phones as egg timers, or just order an Uber eats instead lol :D
Thank you.
You can use any general purpose small signal NPN or mosfet and save the resistors. If your current per segment is not more than 3mA you can drive it directly from the Arduino output.
Young people can use the timer to time the takeaway service to see if they are lucky to get a free delayed meal.
 
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