build this versatile electronic combination lock part one
#electronic lock
#combination lock
#security
#access control
#keypad
#digital circuit
#microcontroller
#authentication
#embedded system
#DIY electronics
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4 digit keypad controlled switch
This is a universal version of the four-digit alarm control keypad. The design has been modified to free up the relay contacts, enabling the circuit to function as a general-purpose switch. A single pole changeover (SPCO) or single pole double...
Electronic Lock
Digital IC, Electronic Lock This is an electronic code lock that can function as a door latch or ignition key. The operation is somewhat complex, which contributes to the appeal of the circuit.
The electronic code lock utilizes a digital integrated...
IR On/Off Switch Using Microcontroller
Turning electrical devices ON or OFF using a remote control is a well-established concept, with numerous devices available that perform this function effectively. To create such a device, it is necessary to construct a receiver and a transmitter, as well...
Electronic combination lock
When button S12 is pressed, a positive voltage supplied through resistor R1 appears at the base of transistor Q1, activating it. Once Q1 is conducting, pin 1 of U1 is connected to ground (0V) or the negative terminal of the...
Experimental I/O board for microcontrollers
For beginners experiencing similar challenges, a general-purpose I/O board is recommended to minimize prototyping time and maximize space on the breadboard for projects. The construction of this board is straightforward. Basic I/O devices can be soldered onto a general-purpose perforated...
Password Based Door Locking
Security is a prime concern in our day-to-day life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based Door locker is an access control...
Four-Digit Keypad-Operated Switch
This is a universal version of the Four-Digit Alarm Keypad. The design of the output section has been modified to free up the relay contacts, allowing the circuit to function as a general-purpose switch. A single-pole changeover (SPCO) or single-pole...
Universal Four-Digit Keypad-Operated Switch - Construction Details
The key connected to "E" is used to energize the relay, while the four keys connected to A, B, C, and D are used to de-energize it. All other keys on the keypad are connected to "F". When "E" is...
µP-Controlled Oscillator Delivers Rock-Bottom Distortion
Function generators are essential in the design, testing, and operation of encoders, modulators, demodulators, and measurement instruments. This document presents an economical method to construct a bus-controlled sinewave oscillator that exhibits exceptionally low distortion. The circuit produces a sinusoidal output...