Arduino while loop exit code#
Arduino while loop exit password#

Arduino while loop exit code#

Of code that follows the expression is repeated. If the expression is true (not zero) then the block The while keyword uses the expression (within the parentheses following the the while order of the words 'while' and 'do' defines these concepts. Have to think about 'how to do it'! The structure of the code i.e. It is true that you can use the for-loop to do both of these actions -īut it is far easier to use the while loop construct because you don't Always execute code first then test a variable for the exit condition.Execute code until a variable reaches a set value.The most useful aspect of this loop construct is that it provides implementation of twoĮasy concepts that you may want to use when writing code: Increment the varible anywhere within the loop Outside the while loop using normal variable intialisation and you Not have the initialiser or incrementer sections - you set these up You conditionally repeat a block of code. The while loop is another loop control structure that lets Has an alternate form: the do.while loop.Is an alternative looping syntax to the for-loop syntax.There are two forms of this loopĬonstruct which make it easier than using the for-loop. Arduino While Loop Arduino While loop: How you can use.If (!buttonStates) allButtonsOpen = false Serial.println(' keys to prime system for unlocking.')

save the current state as the last state, for next time through the loop If (buttonStates = LOW) // changed to pressed If (buttonStates != lastButtonStates) // means it changed. compare the buttonState to its previous state make sure the button is from pin to groundīuttonStates = digitalRead(buttonPins) initialize the button pins as input with pullup so active low Serial.println(' switches in sequence to unlock') Here's my code for my thinking in #3: // īool seeDebugPrints = false //set this true or false depending on if you want to see the keys as they are hitĮnum // these are indices, not pin numbers (which are acually 12,11,10,9) If any of the positions caused the flag to go false, remain in the off state, and the buttons are ready for the next attempt.

(But don't alert the user, else they could eventually figure out the sequence.) If no match, set the allCorrectSoFar flag to false. Compare the actual button to the target button. Have a counter for how many positions have been checked.Īt the top of loop look for any button to show a state change: from its position in the button array, you will know which button it is, and from the counter you will know its position in the sequence.

Arduino while loop exit password#

(Which as a side benefit makes it easier to change the password one day!) Have a boolean flag allCorrectSoFar, initialised true.Īlso have the button pins themselves in an array.

I would store the target pin sequence in an array. I would take a totally different approach to yours.

Why don't you use buttons rather than switches, and look for them to become pressed, then you don't have to switch them back later on: they'll be released right after being pressed. While(digitalRead(12)= LOW & digitalRead(11)= LOW & digitalRead(10)= LOW & digitalRead(9)= LOW) While(digitalRead(12)= LOW & digitalRead(11)= LOW & digitalRead(10)= LOW & digitalRead(9)= HIGH) While(digitalRead(12)= LOW & digitalRead(11)= LOW & digitalRead(10)= HIGH & digitalRead(9)= HIGH) While(digitalRead(12)= LOW & digitalRead(11)= HIGH & digitalRead(10)= HIGH & digitalRead(9)= HIGH) How can I make the code only back down only one level at a time and still have the previous switch sequence valid? const int magLock = 13 I tried using the break function in an if nested if statement but it seems to exit all of the while loops. The code as-is works fine but my problem is that if the switches are triggered out of sequence they all need to be turned off before restarting. I have 4 switches that need to be activated in a certain order to trigger the maglock.