Help on my digital watch

[GrandPete]

Having problems with a button

Hi, what my project does is, when sensor1 is activated it starts a timer and when sensor 2 is activated it stops the timer. Lcd displays this calculation 10/..(time between sensors)....=......... So I added a push button. Every time someone pushes it "10" in the calculation increments by 10. My project works fine until here. Here is my 2 problem: After I press the button and the value 10 becomes 20, I want it to find the result of the new operation like I push the button 2 times and then activ…

a school mate of yours?