Updated sketch here: http://www.phpbbireland.com/kiss2/viewtopic.php?f=80&t=265Features:Allows three different passwords...Lockout if tampering (allows three attempts and then lock the keypad for X seconds)...Uses a piezo device to generate keyboard tone and door open tone...Backlight off if inactive, any key to turn on backlight...Software driven contrast (user can set level)...Latched output (relay 3 seconds)...A test menu with some options (just testing)...
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via Egeo 16