I know how to collect data from dtmf but I dont know how to use it as a passcode
I had asked how to control the reset switch on the arduino board by a code in the script.
Ok....do u know how to go one instruction back on a command being pressed
I don't wish to sound patronising, but you don't.
Typically, you'd store all the characters in an array, as they are entered, unless the character is a special character, like enter or backspace. If the character IS enter, you do something with the stored data. If the character IS the backspace, you replace the last character in the array with a NULL and decrement the index.
And I don't know how to instruct the arduino that I have given a backspace.