Imagine you are giving a gift to someone, but you want them to solve your question and enter your secrete password.
You want the password to be entered in order and if touch any other will fail. For example if you want enter "dog", then we can use:
*from "make: electronics"
the user have to press button E,F,G,H in sequence without touching button B,C,D to get output from the last logic gate.
But what about when you want him enter a password like "hook"? (with 2 same letter)
*In the current circuit if you push "hok" instead of "hook" it will also work.
but we only want the user press "hook"
I designed a circuit, but seems missing something:
anyone have any idea?