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Morse decoder in avr atmega85/26/2023 The schematic and the BOM (Bill of Material is given below). You can fabricate the circuit on any general purpose PCB or breadboard. So the dimming is very smooth and it is like those used in many mobile phones. The cool thing about this is that it uses PWM to control the brightness of LCD Backlight. ![]() The backlight of LCD turns off automatically when the system is idle for few seconds. The smart code lock also support power saving feature. Here you need to enter the old password to gain permission, then enter the new password. ![]() For this enter a special password which is ‘0000’, as soon as the system receives this special password it switches to change password mode. The smart code lock has the feature to change the password too. At anytime you may press the "Cancel" key (S12 )to clear the input (e.g. You just need to press a key to deactivate the relay.Īfter typing four digit password you must press the "OK" button (S8). The relay remains on as long as the user wishes. This is indicated by a LED which is placed near the relay. As soon as correct password is entered the relay is activated. The main LCD Module is used to display messages to the user. The password is entered using the built in 4×4 keypad matrix. ![]() ![]() The user must enter a correct password to gain access. This device can be used to code protect any electrical device (like an electronic door, lock or safe).
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