![]() ![]() After that, Solder the LDR between pin 3 & pin 4 of the LM358 IC.Ĥ) After that, solder the collector terminal of the BC547 transistor with pin 2 & the emitter terminal with pin 1 of the 555 timer IC.ĥ) Solder a 220Ohm resistor between the output pin of the LM358 Op-Amp & the base pin of the BC547 transistor.Ħ) After that, Solder a 100nF capacitor between pin no.5 and 1 of the timer IC.ħ) Solder a Reset pushbutton between pin 4 & pin 1 of the 555 timer IC.Ĩ) After that solder a 10K resistor between pin 4 & 8 of the timer IC. Also, solder the middle pin of the 10K pot with pin 2 of the LM358 IC.ģ) Now solder a 10K resistor between pin 3 & pin 8 of the Op-amp IC. You will need the following parts to build this project: S.Noġ) Solder the NE555 timer IC & the LM358 Op-Amp on the veroboard.Ģ) After that solder the fixed ends of a 10K pot on pin 4 & pin 8 of the timer IC. The threshold voltage of the NE555 timer IC is decided by the output voltage of the voltage divider configuration (LDR & R2), here the NE555 is running in astable (free running mode). The resistance value of an LDR decreases when the intensity of light increases. Its behavior is similar to a photocell that works on the principle of photoconductivity. ![]() LDRs are electronic components that are sensitive to light intensity. The heart of this laser security system is a light dependent resistor or an LDR. So, in today’s tutorial, we are going to go over a step by step procedure on How To Make A Laser Tripwire Home Security System Using 555 Timer IC, an amplifier, and an LDR. They are commonly used in places such as bank vaults & museums, in order to protect high value objects from thieves. A laser tripwire security system raises an alarm when breaks its line of sight. They have become a necessity in such uncertain times and no home is truly safe without the presence of at least some semblance of home security setup. Home security setups allow you to protect your private property from any undesirable intrusion of burglars and robbers. Related posts: What is a Laser Tripwire Home Security System? ![]()
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