The reason why I’m using a LCD display is because it allow me to display many characters and it doesn’t need to be “refreshed” as 7-segment Led displays. Also, the interface requieres less I/O pins. For this project I used a 16×1 LCD Display with 4-bits interface. 22pF capacitors keeps the clock accurate. Read the [...]
This simple combination lock accommodates codes from 1-9 digits long, with the only restriction being that the same digit cannot be used twice. The circuit shows strapping for a 4-digit code, in this case “2057″. Any unused switches are strapped to ground. When power is applied, the 330nF capacitor connected to pin 1 of inverter [...]
Today younger brother generation that study same college comes to see at a house and beg to seek design good circuit and free. I advises a program TindyCAD because it drawing circuit diagrams commonly known as schematic drawings. It supports model the equipment is a lot of and still apply to PCB layout programs change [...]
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