Simple Alarm ir led and photodiode NE555

272

04:59:59

Basic monostable multivibrator, 
please correction of this circuit, if there is an error please be guided.
alarm circuit using a photodiode and ir led.

if the ir led and photodiode blocked an object, it will send a signal to the warning lamp.
To set delay  'on lamp' set the caps.
Here I do not find the speaker components,   then I use the lamp as a replacement speaker 

:D CMIIW

published 9 years ago

olatinwo

9 years ago

Pls can u tell me the principle

SeMPRuL

9 years ago

@olatinwo > Main component used here is a photodiode and IR led. We are creating a continuous loop arrangement, 555 timer used here works in the monostable mode of operation. IR led continuously strikes infrared beams on the photodiode. As a result the trigger pin (2nd pin) of 555 will get the positive voltage from Vcc . When an intruder cuts the IR beam, photodiodes act as an open circuit

SeMPRuL

9 years ago

Sorry my english is not good

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