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Category: Security Circuits / Lock Circuits Views: 2870 Rank: 0 A programmable code lock can be used for numerous applications in which access to an article/gadget is to be restricted to a limited number of persons. Here is yet another circuit of a code lock employing mainly the CMOS ICs and thumbwheel switches (TWS) besides a few other components. It is rugged and capable of operation on voltages ranging between 6 and 15 volts. The supply current drain of CMOS ICs being quite low, the circuit may be operated even on battery.The circuit uses two types of thumbwheel switches. switch numbers TWS1 through TWS8 are decimal-to-BCD converter type while switch numbers TWS9 through TWS16 are 10-input multiplexer type in which only one of the ten inputs may be connected to the output visit page. The circuit uses two types of thumbwheel switches. switch numbers TWS1 through TWS8 are decimal-to-BCD converter type while switch numbers TWS9 through TWS16 are 10-input multiplexer type in which only one of the ten inputs may be connected to the output http://www.electronic-circuits-diagrams.com/homegardenimages/homegardenckt2.shtml
Related circuits Here's an effective little combination lock that you can put together in one evening's time. To open the lock, simply dial in the correct combination on the three rotary or thumbwheel switches. With the correct combination entered, current flows through Rl into Ql's gate terminal, causing the SCR... The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the... 1 button Security locking circuit The Button Code is a system that allows a single button to act as a keypad. The user enters a 4 digit code into the system using button taps. The button can be placed where the public can access it since like a keypad there are many combinations to keep guessers from activation the system. When... The circuit uses a four-bit latch (Ul). What makes the circuit sequential is that the set input of the first bit latch is tied Figure 1 is the block diagram of an easily programmed, single-button combination lock. You operate the lock by using a series of short and long pulses from a momentary switch that masquerades as a doorbell button. The circuit uses inexpensive CMOS logic. The retriggerable timer, T1, locks out... This electronic lock can be used with any type of iButtons you may already have, since the only thing needed is the internal serial number, that's different for every iButton. The command used to read the serial number is the same for all iButtons. The iButton family code that goes with every... Security Lock with keypad and LCD (PIC16F84A) Finally I was able to control an LCD Hitachi display and a 12-key matrix keypad with only one 16F84 or 16F628. In a near future, I will be able to control a full QUERTY-type keyboard and a LCD display. The biggest improvement on this projects was the compatibility with the Microchip PIC 16F84 and... The simplest Electronic Door Lock To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 butoons S5 S8 are pushed the relay donts tension ( dont receives supply voltage ). The supply voltage must be equal to the working voltage of the relay. One transistor like BD135 can commute up to 0.5A, in the...
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Good information about Programmable Digital Code Lock ?? You can learn and download Programmable Digital Code Lock online here !!
With the advancing progress in IC technology, the timing generator can be implemented and integrated as the analog front-end circuitry with other digital circuitry inside the same chip. In recent designs, delay-locked loops ...
A programmable cipher lock can be acclimated for abundant applications in which admission to an article/gadget is to be belted to a bound cardinal of persons. Actuality is yet addition ambit of a cipher lock employing mainly the CMOS ICs and ...
Most of these circuits will be added to instructables after Christmas. THIS instructable is for a combination lock circuit that I created using the LS7222 user-programmable combination lock IC as a platform. The user can ...
SAB0529 programmable timer circuit diagram electronic project. ... Using SAB0529 integrated circuit can be build a very simple timer with a programmable time between 1 second and 31 hours and 30 minutes. This electronic circuit can be ... The electronic lock... Electronic lock circuit diagram usi...
It has 16kB in-system programmable flash program memory with read while- write capabilities, 512 bytes of EEPROM, 1kB SRAM, 32 general purpose input/output (I/O) lines, 32 general-purpose working registers,three flexible timers/counters with compare modes, internal and external interrupts, a seri...
Electronic keycode lock
Digital Door Lock (PROTEUS Simulation)
Comments
Eng.Ibn Sayah wrote on Mar 25, 2010
good Job can I make this curicts or not Thank you
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