Hiii….friends this time we ae going to implement another 555
timer IC project. With this project we can operate the operation of locking or
unlocking it is just a dummy project it does not lock or unlock any thing it
just operates some electronic action when switches of correct number are pressed.
CIRCUIT DIAGRAM
Here we are using six switches ( you can add more) in which 3 are CORRECT
SWITCH and 3 are WRONG SWITCHES only right combination of COORECT SWITCHES
unlocks the circuit.
In the circuit 555 timer IC is used in bistable mode , which
can be reset or triggered by applying a low input on the corresponding pin. The
CORRECT SWITCHES are connected to trigger pin( PIN2) when all the switches are
pressed trigger pin receives a low input and the LED glows which means the
circuit is unlocked. But in case any WRONG SWITCH connected in parallel and connected to reset pin(PIN4) is pressed the
circuit gets reset and LED does not blink means circuit is not unlocked so a
correct switch combination can only unlock the circuit. In this circuit the circuit unlocks only when
S1, S2, S3 are pressed and unlocks if any of S4,S6,S5 is pressed .For operating any AC appliance u
can use relay also.
COMPONENT REQUIRED
R1-R2
RESISTORS(100K)
R3 RESISTOR(1M)
R4
RESISTOR(330R)
C1,C2 CAPACITOR(1nF)
S1-S6 SPST
SWITCHES
D1 LED(
YOUR FAVOURITE COLOUR..;))
U1 IC555
I hope you found it helpful, in case
of any doubt, question or critical view just leave a comment.
THNX…J
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